本研究探討純銅經過不同眼模道次(斷面縮減率)連續抽線後的機械性質與破壞行為。 8.0mm SCR純銅銅條分別經八道次、七道次及六道次等三組眼模組合連續抽線至 3.0mm；另外，將八道次眼模組的第一道次眼模換成兩個小減面眼模，探討“skin pass”造成的影響。銅條經不同眼模道次連續抽線後分組取下，再依照ASTM B1的規範，製成標距長度的拉伸試件。試件分別以萬能材料試驗機、微硬度機量測加工硬化的變化，利用OM技術觀察各道次銅線徑向及縱向晶粒變形的演化，以界定抽拉變形後試件之纖維織構生成量，再搭配背向散射電子繞射(EBSD)測量晶粒優選方位，釐清其與機械性質之相關性。最後藉由SEM觀察試件的破壞形貌特徵及機制。

　　實驗結果顯示，純銅使用不同眼模道次連續抽線，機械性質會受到影響，塑流應力值、微硬度值及楊氏模數(Young´s Modulus)隨著應變量增加而上昇，破斷應變量降低。EBSD量測結果顯示，加工應變量增加，＜111＞優選方位的比例增加，＜100＞的比例降低。在塑性變形過程中，＜111＞方位比例增加會造成塑流應力值、微硬度值及楊氏模數昇高和破斷應變量的降低。但在本實驗中六道次連續抽線的最後一道次( 3.533mm→ 3.000mm)，塑流應力值、微硬度值及楊氏模數降低而破斷應變量增加，由其＜111＞的比例降低可證實產生動態回復及再結晶。此外，再比較八道次與搭配“skin pass”的九道次連續抽線，結果顯示“skin pass”可提高強度，這是由於＜111＞優選方位的比例較高，但隨著應變量增加，此效應逐漸遞減，相反的在九道次連續抽線的最後一道次( 3.391mm→ 3.000mm)，塑流應力值、微硬度值及楊氏模數降低而破斷應變量增加，可由其＜111＞的比例降低證實產生動態回復及再結晶。不論是經過幾道次的純銅連續抽線，在進行拉伸測試後，皆發現斷口頸縮及斜向破壞之外觀特徵，再配合SEM觀察斷口形貌，發現極多韌窩(dimple)組織，故推斷其破壞模式皆屬延性破壞。且韌窩之大小隨加工量增加而減小。但是在六道次及九道次連續抽線的最後一道次由於動態回復及再結晶，引起加工軟化，因此韌窩反而變大。

　　In this study, SCR (southwire continuous casting rod) copper rods of diameter 8.0mm are drawn continuously down to copper wires of 3.0mm diameter in drawing processes comprising various numbers of individual passes, 8-passes(reduction area: 21.8%/pass), 6-passes(reduction area: 27.9%/pass) and 7-passes(reduction area: 24.4%/pass). The influence of the number of drawing passes on the mechanical properties and fracture behavior of the copper wires is investigated. The “skin pass” effect is also studied. In order to investigate the mechanical properties, the deformed copper wires are grouped into four sets, and are tested using an universal testing machine and a Vickers hardness gauge to determine the variation of work hardening. The distortion of the copper grains and the fine and fiber textures in the cross-section and longitudinal sections are inspected and observed using OM instrumentation. Meanwhile, the preferred orientation of the grains is measured by the EBSD (electron back-scattered diffraction) technique to establish the relationship between the orientation and the mechanical properties. Finally, the specimens are observed with SEM to identify the fracture characteristics and mechanisms. The current results reveal that the different drawing passes have specific effects on the mechanical properties of the copper wires. Specifically, the flow stress, Vickers hardness and Young’s modulus increase with increasing strain, while the breaking strain decreases. The EBSD measurement indicates that the <111> orientation increases with increasing strain, while the <100> orientation decreases. In the final pass of the 6-passes set, the flow stress, Vickers hardness and Young’s modulus decrease, while the breaking strain increases. Furthermore, it is evident that the copper exhibits dynamic recovery and recrystallization due to a less intense <111>. Comparing the 8-passes and 9-passes drawing sets, it is clear that the “skin pass” enhances the tensile strength due to a higher ratio of <111>. However, this effect is gradually lessened as the strain rate increases. Inversely, in the final pass of the 9-passes set, the flow stress, Vickers hardness and Young’s modulus decrease, while the breaking strain increases. It is evident that the copper develops dynamic recovery and recrystallization due to a less intense <111>.

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