中文摘要 Ⅲ 英文摘要 Ⅳ 總目錄 Ⅴ 表目錄 Ⅶ 圖目錄 Ⅷ 第一章　序論 1 　　１－１前言 1 　　１－２基礎理論 3 　　　　１－２－１噴覆成型製程 3 　　　　１－２－２半固態矽顆粒粗化製程 3 　　　　１－２－３磨耗理論 5 第二章　實驗的方法與步驟 9 　　２－１實驗目的 9 　　２－１實驗材料及設備 10 　　２－３噴覆成型製程 12 　　２－４擠形製程 12 　　２－５半固態矽顆粒粗化製程 13 　　２－６半固態電磁攪拌製程 14 　　２－７傳統鑄造製程 14 　　２－８材料熱壓步驟 14 　　２－９磨耗試驗 15 　　２－１０硬度值量測 16 第三章　結果與討論 17 　　３－１噴覆成型製程參數 17 　　３－２半固態矽顆粒粗化實驗 18 　　３－３半固態粗化處理合併熱壓處理 20 　　３－４半固態電磁攪拌 22 　　３－５傳統鑄造高矽鋁合金 23 　　３－６微細初晶矽3-5μm(噴覆成型) 高矽鋁合金磨耗性質探討 23 　　　　３－６－１滑移速度對磨耗速率的影響 23 　　　　３－６－２正向力(Load) 對磨耗速率的影響 25 　　　　３－６－３不同矽含量對磨耗速率的影響 27 　　　　３－６－４鑄鐵對手材磨耗觀察 29 　　３－７初晶矽30-60μm(半固態電磁攪拌) 高矽鋁合金磨耗性質探討 30 　　　　３－７－１滑移速度對磨耗速率的影響 30 　　　　３－７－２正向力(Load) 對磨耗速率的影響 31 　　　　３－７－３不同矽含量對磨耗速率的影響 33 　　　　３－７－４鑄鐵對手材磨耗觀察 35 　　３－８初晶矽80-100μm(半固態電磁攪拌) 高矽鋁合金磨耗性質探討 35 　　　　３－８－１滑移速度對磨耗速率的影響 35 　　　　３－８－２正向力(Load) 對磨耗速率的影響 36 　　　　３－８－３不同矽含量對磨耗速率的影響 37 　　　　３－８－４鑄鐵對手材磨耗觀察 39 　　３－９不同初晶矽顆粒尺寸磨耗速率之比較 40 第四章　結論 45 參考文獻 48 表 52 圖 60 　　 表目錄 Table 1 Compositions of the raw materials 52 Table 2 Process parameters for extrusion 52 Table 3 Extrusion temperature for various hypereutectic Al-Si alloys 52 Table 4 The variety times of semisolid soaking 53 Table 5 Semi-solid treatment times of variety composition 53 Table6 The compositions of hypereutectic Al-Si alloy of spray forming process and Casting process 53 Table 7 Compositions of the IDE 53 Table 8 Wear experiment parameters for present and other studies Microhardness of variety wear materials 54 Table 9 The hypereutectic Al-Si alloys density and volume fraction percentage 54 Table 10 Microhardness of variety wear materials 55 Table 11The parameters of spray forming process 55 Table 12The constant of growth kinetic D=Do+kt1/n 55 Table 13 The composition of semi-solid specimens at the effect of macro segregate 56 Table 14 Present experimental parameter about material 56 Table 15 The bulk hardness of (a) spray-forming hypereutectic Al-Si alloy (b) semi-solid hypereutectic Al-Si alloy (c) casting hypereutectic Al-Si alloy 57 Table 16 The wear surface hardness of (a)spray-forming hypereutectic Al-Si alloy (b)semi-solid hypereutectic Al-Si alloy (c) casting hypereutectic Al-Si alloy 58 Table 17 The Si Particle refine size in worn subsurface of hypereutectic Al-Si alloys 59 Table 18 summary of n at difference condition 59 圖目錄 Fig.1 Schematic diagram of droplet deposition onto substrate during spray forming 60 Fig.2 The variation of the coefficient of frictionμ, with normal load ,W, for the unlubricated sliding of steel on Al in air 60 Fig.3 The variation of the coefficient of friction, μ, with apparent area of contact for wooden silders on an unlubricated steel surface 61 Fig.4 Schematic diagram illustrating the principles behind the coulomb for sliding friction 61 Fig.5 An experiment to illustrate adhesion between metal 62 Fig.6 Model for the deformation component of friction 62 Fig.7 Stresses acting on an element within an idealized asperity pressed against a counterfaceFig.8 The variation of coefficient of friction 63 Fig.8 The variation of coefficient of friction, μ.with the ratio between the shear strength of the interface and that of the bulk material 63 Fig.9 Diagram illustrating one way by which detachment of a fragment of material might result from plastic deformation of an asperity tip 64 Fig.10 Formation of a transfer particle by asperity rupture and aggregation 65 Fig.11 Schematic diagram showing how the severity of plastic deformation is distributed beneath a worn metal surface in the severe wear regime 66 Fig.12 Schematic diagram of Spray Forming Process 66 Fig.13 The instruments of semi-solid process in the furnace of Shimaduz machine 67 Fig.14 Schematic diagram of retrieving specimen from the hot pressure mold 68 Fig.15 Schematic diagram of (a) upper wear specimens and holder and (b) lower wear specimens and holder on pin-on disc wear mold 69 Fig.16 Schematic diagram of pin-on-disc wear testing 70 Fig.17 Metal flow rate of Al-Si alloys metal flow rate in spray-forming process 71 Fig.18 (a) The billet of Al-18Si of spray forming (b)(c)(d) is the metallograph 71 Fig.19 (a) The billet of Al-25Si of spray forming(b)(c) (d)is the metallograph 72 Fig.20 (a) The billet of Al-32Si of spray forming (b)(c) (d) is the metallograph 73 Fig.21 The metallograph of(a)(b)(c)represent sfp Al-18Si billet outer, middle and center position respectively and (d)(e)(f) represent sfp Al-25Si billet outer, middle and center position respectively and(g)(h)(i) represent sfp Al-18Si billet outer, middle and center position respectively 74 Fig.22 Al-18Si alloy 600℃ semi-solid coarsening for (a) 600s (b) 1200s (c) 1800s (d)2400s (e) 3000s (f) 3600s (g) 5400s (h) 7200s 75 Fig.23 Al-25Si alloy 600℃ semi-solid coarsening for (a) 600s (b) 1200s (c) 1800s(d) 2400s (e) 3000s (f) 3600s (g) 5400s (h) 7200s 75 Fig.24 Al-32Si alloys 600℃ semi-solid coarsening for (a) 600s (b) 1200s (c) 1800s .(d) 2400s (e) 3000s (f) 3600s (g) 5400s (h) 7200s 76 Fig .25 Primary Si particle size vs. semi-solid coarsening time of various spray-formed hypereutectic Al-Si alloys 77 Fig.26 Metallograph of Al-32Si alloy (a)semi-solid coarsening without hot compression (b)semi-solid coarsening with hot compression 78 Fig.27 Metallograph ofAl-18Si alloys semi-solid coarsening for 36min followed by hot compression (a) bottom of specimen (b)middle of specimen(c)top of specimens 78 Fig.28 Metallograph ofAl-18Si alloys semi-solid coarsening for 90min followed by hot compression (a) bottom of specimen (b) middle of specimen(c) top of specimens 78 Fig.29 Metallograph ofAl-25Si alloys semi-solid coarsening for 22min followed by hot compression (a) bottom of specimen (b)middle of specimen( c)top of specimens 79 Fig.30 Metallograph ofAl-25Si alloys semi-solid coarsening for 74min followed by hot compression (a) bottom of specimen (b)middle of specimen(c)top of specimens 79 Fig.31 Metallograph ofAl-32Si alloys semi-solid coarsening for 19min followed by hot compression (a) bottom of specimen (b)middle of specimen(c)top of specimens 79 Fig.32 Metallograph ofAl-32Si alloys semi-solid coarsening for 60min followed by hot compression (a) bottom of specimen (b) middle of specimen(c)top of specimens 79 Fig.33 Electronic-magnetic stirring hypereutectic Al-Si alloys coarsening time vs. particle size (μm) 80 Fig.34 Metallograph of electromagnetic stirred (a)Al-18Si alloy 36mins(b)Al-25Si alloy 22mins (c)Al-32Si alloy 19min(d)Al-18Si alloy 90mins (e)Al-25Si alloy 74mins (f)Al-32Si alloy 60 min 80 Fig.35 the relationship of cast Al-xSi vs. particle size 81 Fig.36 the Metallograph of cast hypereutectic Al-Si alloys 81 Fig.37 (a)(b)(c) Wear rate vs. speed of hypereutectic Al-Si alloys with 3-5μm primary Si particles for various Si contents (d)(e)(f) wear rate vs. load of hypereutectic Al-Si alloys with 3-5μm primary Si particles for various Si contents 82 Fig.38 Wear rate vs. pressure of hypereutectic Al-Si alloys with 3-5μm primary Si particles for various speed 83 Fig.39 (a)(b)(c) Wear rate vs. speed of hypereutectic Al-Si alloys with 30-60μm primary Si particles for various Si contents (d)(e)(f) wear rate vs. pressure of hypereutectic Al-Si alloys with 30-60μm primary Si particles for various Si contents 84 Fig.40 Wear rate vs. pressure of hypereutectic Al-Si alloys with 30-60μm primary Si particles for various speed 85 Fig.41 (a)(b)(c) wear rate vs. speed of hypereutectic Al-Si alloys with 80-100μm primary Si particles for various Si contents (d)(e)(f) wear rate vs. speed of hypereutectic Al-Si alloys with 80-100μm primary Si particles for various Si contents 86 Fig.42 wear rate vs. speed of hypereutectic Al-Si alloys with 80-100μm primary Si particles for various speed 87 Fig.43 Variation in (a) strength and (b) elongation with silicon content: 88 Fig.44 The mechanism of adhesion cutting plough 88 Fig.45 Schematic diagram of temperature distribution (isotherms) around sliding contacts 88 Fig.46 (a) Schematic representation of asperity interaction (b) orientation and directionality of roof tile laminates at the wear interface 89 Fig.47 Variation of states of stress in the roll gap that may lead to edge cracking 89 Fig.48 Schematic representation the model of Si particle refined 90 Fig.49 Schematic of Model of two body abrasive 90 Fig.50 Worn surface morphologies fo Al-18Si alloys with 3-5μm primary Si particle for wear pressure of 1.04Mpa and wear speed of (a) 1.47m/s(b) 2.1m/s at constant distance 1.008km 90 Fig.51 Worn surface morphologies of Al-18Si alloys with 3-5μm primary Si particle for wear pressure of 0.173Mpa and wear speed of (a)0.63m/s, and(b)1.47m/s (c)2.1m/s at constant distance 1.008km 91 Fig.52 Worn surface morphologies of Al-25Si alloys with 3-5μm primary Si particle for wear pressure of 0.173Mpa and wear speed of (a) 0.63m/s(b) 1.47m/s (c)2.1m/s at constant distance1.008km 91 Fig.53 Worn surface morphologies of Al-32Si alloys with 3-5μmprimary Si particle for wear pressure of 0.173Mpa and wear speed of (a) 0.63m/s(b) 1.47m/s(c)2.1m/s at constant distance 1.008km 92 Fig.54 Worn surface morphologies of Al-18Si alloys with 3-5μm primary Si particle for wear pressure of 0.572Mpa and wear speed of 0.63m/s at constant distance 1.008km 93 Fig.55 Worn surface morphologies of Al-25Si alloys with 3-5μm primary Si particle for wear pressure of 0.572Mpa and wear speed of (a) 0.63m/s(b) 1.47m/s at constant distance 1.008km 93 Fig.56 Worn surface morphologies fo Al-32Si alloys with 3-5μm primary Si particle for wear pressure of 0.572Mpa and wear speed of (a) 1.47m/s(b) 2.1m/s at constant distance 1.008km 93 Fig.57 Worn surface morphologies of Al-18Si alloys with 3-5μm primary Si particle for wear pressure of 1.04Mpa and wear speed of (a) 0.63m/s(b) 2.1m/s at constant distance 1.008km 94 Fig.58 Worn surface morphologies of Al-25Si alloys with 3-5μm primary Si particle for wear pressure of 1.04Mpa and wear speed of 2.1m/s at constant distance 1.008km 94 Fig.59 Worn surface morphologies of Al-32Si alloys with 3-5μm primary Si particle for wear pressure of 1.04Mpa and wear speed of 2.1m/s at constant distance 1.008km 94 Fig.60 Subsurface wear affected zone of Al-18Si alloys with 3-5μm primary Si particle for wear pressure of 0.173Mpa and wear speed of 0.63m/s at constant distance 1.008km 95 Fig.61 Subsurface wear affected zone of Al-18Si alloys with 3-5μm primary Si particle for wear pressure of 0.57Mpa and wear speed of (a) 0.63m/s and (b)1.47m/s at constant distance 1.008km 95 Fig.62 Subsurface wear affected zone of Al-18Si alloys with 3-5μm primary Si particle for wear pressure of 1.04Mpa and wear speed of (a) 0.63m/s and (b) 2.1m/s at constant distance 1.008km 95 Fig.63 Subsurface wear affected zone of Al-25Si alloys with 3-5μm primary Si particle for wear pressure of 0.17Mpa and wear speed of (a) speed0.63m/s(b) 2.1m/s at constant distance 1.008km 96 Fig.64 Subsurface wear affected zone of Al-25Si alloys with 3-5μm primary Si particle for wear pressure of 0.57Mpa and wear speed of (a) 0.63m/s and(b) 1.47m/s 96 Fig.65 Subsurface wear affected zone of Al-25Si alloys with 3-5μm primary Si particle for wear pressure of 1.04Mpa and wear speed of (a) 0.63m/s and (b) 1.47m/s 97 Fig.66 Subsurface wear affected zone of Al-32Si alloys with 3-5μm primary Si particle for wear pressure of 0.17Mpa and wear speed (a)(b) 1.47m/s 97 Fig.67 Subsurface wear affected zone of Al-32Si alloys with 3-5μm primary Si particle for wear pressure of 0.57Mpa and wear speed of 2.1m/s and (b) the magnification of (a) 97 Fig.68 Subsurface wear affected zone of Al-32Si alloys with 3-5μm primary Si particle for wear pressure of 1.04Mpa and wear speed of (a) 1.47m/s and(b) 2.1m/s 98 Fig.69 Morphologies of wear debris of Al-18Si with 3-5μmprimary Si particle for wear pressure of 0.104Mpa (a) speed0.63m/s(b) speed2.1m/s 98 Fig.70 Morphologies of wear debris of Al-18Si with 3-5μmprimary Si particle for wear pressure of 0.104Mpa and speed of1.47m/s 99 Fig.71 Morphologies of wear debris of Al-25Si with 3-5μm primary Si particle for (a)wear pressure of 0.173Mpa and speed of 1.47m/s (b)wear pressure of 0.572Mpa and speed of 2.1 m/s 99 Fig.72 Morphologies of wear debris of Al-32Si with 3-5μm primary Si particle for wear pressure of (a)(b) 0.572Mpa and speed of 1.47m/s(c)(d) 1.04Mpa and speed2.1m/s 100 Fig.73 Worn surface morphologies of FDC wear with Al-18Si alloys with 3-5μm primary Si particle for wear pressure of 0.104Mpa and speed of 0.63m/s(b) (C)is the magnification of (a) at constant distance 1.008km 100 Fig.74 Worn surface morphologies of FDC wear with Al-18Si alloys with 3-5μm primary Si particle for wear pressure of( a) 0.104Mpa and speed of2.1m/s(b) 1.04Mpa and speed of1.47m/s at constant distance 1.008km 101 Fig.75 Subsurface wear affected zone of FDC wear with Al-32Si alloys with 3-5μm primary Si particle for pressure of 1.04Mpa and wear speed of (a)The line scan of Al element pressure 0.17Mpa and speed0.63m/s 101 Fig.76 Subsurface wear affected zone of FDC wear with Al-32Si alloys with 3-5μm primary Si particle for pressure of 1.04Mpa and wear speed of 1.47m/s 102 Fig.77 Worn surface morphologies of Al-18Si alloys with 30-35μm primary Si particle for wear pressure of 0.867Mpa and wear speed of (a) 1.47m/s(b) 2.1m/s at constant distance 1.008km 102 Fig.78 Worn surface morphologies of Al-Si alloys with 30-60μm primary Si particle 103 Fig.79 Worn surface morphologies of Al-18Si alloys with 30-35μm primary Si particle for wear pressure of (a) 0.572Mpa and speed of 1.47m/s for pressure (b) 0.867 Mpa and speed 2.1m/s at constant distance 1.008km 103 Fig.80 Worn surface morphologies of Al-25Si alloys with 40-45μm primary Si particle for wear pressure of 0.572Mpa and wear speed of (a) 0.63m/s(b) 2.1m/s at constant distance 1.008km 104 Fig.81 Worn surface morphologies of Al-25Si alloys with 40-45μm primary Si particle for wear pressure of 0.867Mpa and speed of (a)0.63m/s and(b)2.1m/s at constant distance 1.008km 104 Fig.82 Worn surface morphologies of Al-32Si alloys with 55-60μm primary Si particle for (a)wear pressure of 0.173Mpa and speed of 1.47m/s for (b) wear pressure of 0.572Mpa and speed of 1.47m/sat constant distance 1.008km 104 Fig.83 Worn surface morphologies of Al-32Si alloys with 55-60μm primary Si particle for wear pressure of 0.867Mpa and speed of (a)1.47m/s and (b)2.1m/s at constant distance 1.008km 105 Fig.84Subsurface wear affected zone of Al-18Si alloys with 30-35μm primary Si particle for wear pressure of 0.572Mpa and wear speed of (a)0.63m/s and(b)1.47m/s and wear pressure of 0.867Mpa and wear speed of (c)0.63m/s and (d)2.1m/s at constant distance 1.008km 106 Fig.85 Subsurface wear affected zone of Al-25Si alloys with 40-45μm primary Si particle for wear pressure of 0.173Mpa and wear speed of (a)0.63m/s and (b) 2.1m/s and for wear pressure of 0.867Mpa and wear speed of (c)0.63m/s and (d)1.47m/s at constant distance 1.008km 107 Fig.86 Subsurface wear affected zone of Al-32Si alloys with 55-60μm primary Si particle for wear pressure of 0.173Mpa and wear speed of (a) 0.63m/s and (b) 2.1m/s and for wear pressure of 0.867Mpa and wear speed of (c) (d) 0.63m/s and 2.1m/s at constant distance 1.008km 108 Fig.87 Morphologies of wear debris of Al-18Si with 30-35μm primary Si particle for (a) wear pressure of 0.173Mpa and speed of 0.63m/s for (b)(c) wear pressure of 0.572Mpa and speed of 0.63m/s for (c)wear pressure of 0.867Mpa and speed of 1.47m/s 109 Fig.88 Morphologies of wear debris of Al-25Si with 40-45μm primary Si particle for (a)wear pressure of 0.173Mpa and speed of 1.47m/s for (b) wear pressure of 0.572Mpa and speed of 0.63m/s for (c)wear pressure of 0.867Mpa and speed of 2.1m/s 110 Fig.89 Morphologies of wear debris of Al-32Si with 55-60μm primary Si particle for (a) wear pressure of 0.173Mpa and speed of 1.47m/s for (b) wear pressure of 0.572Mpa and speed of 1.47m/s for (c)(d )wear pressure of 0.867Mpa and speed of 2.1m/s 111 Fig.90 Worn surface morphologies of FDC wear with Al-18Si alloys with 35-40μm primary Si particle for wear pressure of( a) 0.173Mpa and speed of0.63m/s(b) 0.867Mpa and speed of2.1m/s at constant distance 1.008km 111 Fig.91 Worn surface morphologies of FDC wear with Al-25Si alloys with 45-50μm primary Si particle for wear pressure of( a) 0.172Mpa and speed of 1.47m/s(b) 0.867Mpa and speed of2.1m/s at constant distance 1.008km 112 Fig.92 Worn surface morphologies of FDC wear with Al-32Si alloys with 55-60μm primary Si particle for wear pressure of( a) 0.172Mpa and speed of0.63m/s(b) 0.867Mpa and speed of2.1m/s at constant distance 1.008km 112 Fig.93 Subsurface wear affected zone of FDC wear with Al-18Si alloys with 35-40μm primary Si particle for(a) pressure of0.172Mpa and wear speed of 0.63m/s for(b)pressure 0.867Mpa and speed2.1m/s 112 Fig.94 Subsurface wear affected zone of FDC wear with Al-25Si alloys with 40-45μm primary Si particle for(a) pressure of0.172Mpa and wear speed of 1.47m/s for(b)pressure 0.867Mpa and speed2.1m/s 113 Fig.95 Worn surface morphologies of Al-18Si alloys with 80-85μm primary Si particle for wear pressure of 0.867Mpa and speed of 2.1m/s at constant distance 1.008km 113 Fig.96 Worn surface morphologies of Al-18Si alloys with 80-85μmprimary Si particle for (a) wear pressure of 0.172Mpa and speed of 0.63m/s for (b) pressure of 0.572 Mpa and speed of 2.1m/s and for pressure of 0.867 Mpa and speed of (c)0.63m/s and (d) 2.1m/s at constant distance 1.008km 114 Fig.97 Worn surface morphologies of Al-25Si alloys with 80-85μm primary Si particle for wear pressure of 0.572Mpa and speed of (a)0.63m/s (b)1.47m/s for pressure of 0.867 Mpa and speed of(c)0.63m/s and (d)2.1m/s at constant distance 1.008km 115 Fig.98 Worn surface morphologies of Al-32Si alloys with 90-100μm primary Si particle for wear pressure of (a)0.572Mpa and speed of 1.47m/s for pressure(b) 0.867 Mpa and speed 2.1m/s at constant distance 1.008km 116 Fig.99 Figure.99 Subsurface wear affected zone of Al-18Si alloys with 80-100μm primary Si particle 117 Fig.100 Subsurface wear affected zone of Al-25Si alloys with 80-100μm primary Si particle 118 Fig.101 Subsurface wear affected zone of Al-32Si alloys with 80-100μm primary Si particle 119 Fig.102 Morphologies of wear debris of Al-18Si with 80-85μm primary Si particle 120 Fig.103 Morphologies of wear debris of Al-25Si with 80-85μm primary Si particle 121 Fig.104 Morphologies of wear debris of Al-32Si with 90-100μm primary Si particle 122 Fig.105 Worn surface morphologies of Al-25Si alloys 123 Fig.106 The mapping of iron surface which wear with cast Al-18Si at 0.63m/s 0.173Mpa(b)Al element (c )Fe element(d)Si element 124 Fig.107 Metallograph of wear surface of iron which wear with various Si content 125 Fig.108 Subsurface wear affected zone of IDE wear with Al-18Si alloys with 80-85 μm primary Si particle for(a) pressure of0.173Mpa and wear speed of 0.63m/s for (b)pressure 0.867Mpa and speed2.1m/s 125 Fig.109 Subsurface wear affected zone of IDE wear with Al-25Si alloys with 80-85μm primary Si particle for(a) pressure of0.173Mpa and wear speed of 0.63m/s for(b)pressure 0.867Mpa and speed2.1m/s 126 Fig.110 Subsurface wear affected zone of IDE wear with Al-32Si alloys with 90-100μm primary Si particle for(a) pressure of0.173Mpa and wear speed of 0.63m/s for(b)pressure 0.867Mpa and speed2.1m/s 126 Fig.111 The relationship of wear rate vs. pressure about Al-18Si alloys in three different process 127 Fig.112 The relationship of wear rate vs. pressure about Al-25Si alloys in three different process 128 Fig.113 The relationship of wear rate vs. pressure about Al-32Si alloys in three different process 129 Fig.114 The relationship of wear rate vs. speed about Al-18Si alloys in three different process 130 Fig.115 The relationship of wear rate vs. speed about Al-25Si alloys in three different process 131 Fig.116 The relationship of wear rate vs. speed about Al-32Si alloys in three different process 132 Fig.117.The friction coefficient and ECR of Al-Si alloys with 3~5μm primary Si particle wear for pressure of 0.63Mpa 133 Fig118. Diagram of relationship of primary Si size, Si volume fraction and wear at 0.173Mpa 134 Fig.119 Diagram of relationship of primary Si size, Si volume fraction and wear at 0.572Mpa 135 Fig.120 Diagram of relationship of primary Si size, Si volume fraction and wear at 1.04 Mpa for 3~5μm Si particle and 0.867Mpa for other particle size 136 Fig.121 The morphology of Al –Si alloys wear surface at pressure of 0.173Mpa 137 Fig.122 The morphology of Al –Si alloys wear subsurface at pressure of 0.173Mpa 138 Fig.123 The morphology of Al –Si alloys wear pin at pressure of 0.173Mpa 139 Fig.124 The morphology of Al –Si alloys wear debirs at pressure of 0.173Mpa 140 Fig.125 The morphology of Al –Si alloys wear surface at pressure of 0.572Mpa 141 Fig.126 The morphology of Al –Si alloys wear subsurface at pressure of 0.572Mpa 142 Fig.127 The morphology of Al –Si alloys wear pin at pressure of 0.572Mpa 143 Fig.128 The morphology of Al –Si alloys wear debirs at pressure of 0.572Mpa 144 Fig.129 The morphology of Al –Si alloys wear surface at pressure of 1.04Mpa for 3~5μm Si particle and pressure of 0.867Mpa for others 145 Fig.130 The morphology of Al –Si alloys wear subsurface at pressure of 1.04Mpa for 3~5μm Si particle and pressure of 0.867Mpa for others 146 Fig.131 The morphology of Al –Si alloys wear pin at pressure of 1.04Mpa for 3~5μm Si particle and pressure of 0.867Mpa 147 Fig.132 The morphology of Al –Si alloys wear debris at pressure of 1.04Mpa for 3~5μm Si particle and pressure of 0.867Mpa for others 148