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研究生：	陳宗富 Chen, Tzong-Fu
論文名稱：	Al-Zn合金之共振破壞特性研究 A Study on the Vibration Fracture Characteristics of Al-Zn Alloys Under Resonance
指導教授：	陳立輝 Chen, Li-Hui 呂傳盛 Lui, Truan-Sheng
學位類別：	碩士 Master
系所名稱：	工學院 - 材料科學及工程學系 Department of Materials Science and Engineering
論文出版年：	2004
畢業學年度：	92
語文別：	中文
論文頁數：	89
中文關鍵詞：	Zn含量、Al-Zn 合金、冷卻速率、共振破壞
外文關鍵詞：	Cooling Rates, Vibration Fracture, Al-Zn Alloys, Zn Contents
相關次數：	點閱：139 下載：1
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　　長久以來Al-Zn合金被視為一種制振材料，考慮到進ㄧ步的實際應用，本研究進行組成及析出行為對Al-Zn合金共振破壞特性影響之探討。實驗材料為不同Zn含量之Al-Zn合金(Zn含量為7, 11, 49, 83wt%，分別以7Zn、11Zn、49Zn、83Zn表示)，並藉由退火處理後冷卻速率的控制，以獲得水淬(WQ)、空冷(AC)、爐冷(FC)等不同析出狀態之試片。
　　實驗結果顯示，經WQ處理之不同Zn含量試片制振性大小順序為83Zn>7Zn>11Zn>49Zn。在固定出力值之共振測試條件下，雖然83Zn有較好之制振性，但是7Zn振動壽命較佳，49Zn之振動破壞阻抗則均為四者中最差。於固定起始偏移量條件之下振動壽命順序則為7Zn>11Zn>49Zn>83Zn。以上現象與Zn含量不同所導致之組織差異有關。當Zn含量為7至49wt%時，組織特徵為alpha-Al晶粒以及於晶粒及晶界上析出之富Zn相顆粒，制振機制推測為差排滑移。當提高Zn含量時晶粒及晶界上析出物量增加，分別導致差排滑移不易及沿晶破壞發生。當Zn含量為83wt%時，組織呈alpha-Al及beta-Zn相間之層狀共析形態。制振機制應為alpha及beta相間之相界滑移，其制振效果佳，裂縫傳播阻抗卻相當差。
　　以7Zn與83Zn試片進行冷卻速率效應調查結果顯示，兩組試片隨著冷卻速率之增加，制振性均隨之升高。且於固定出力值條件下，皆顯示WQ試片之共振壽命最好；於固定起始偏移量條件之振動壽命，7Zn與83Zn分別以WQ及AC試片最佳。以上現象與冷卻速率不同所導致之析出物量及分佈形態差異關係密切。

　　The Al-Zn alloy has been considered as a high damping material. For practical use, this study investigated the effects of Zn content and precipitation behavior on the vibration fracture characteristics of the Al-Zn alloy under resonance. Al-Zn alloys with different Zn contents were prepared and designated according to their Zn content. To achieve varying degree of precipitation, all the samples were annealed and cooled with various cooling rates to obtain the water-quenched (WQ), air-cooled (AC) and furnace-aged (FC) specimens.
　　Experimental results show that the damping capacity of the WQ samples with different Zn contents decreases in turn from 83Zn, 7Zn, 11Zn and to 49Zn. Under constant force conditions, although the 83Zn exhibits superior damping capacity, the 7Zn shows the greatest vibration life. In addition, the 49Zn sample has inferior vibration fracture resistance. As for constant initial deflection conditions, the vibration life in the decreasing order is 7Zn, 11Zn, 49Zn and then 83Zn. Differences in vibration properties of the samples with various Zn contents can be attributed to their microstructural characteristics. When the Zn content is raised from 7wt% to 49wt%, the microstructure of Al-Zn alloys consists of alpha-Al grains and the precipitates on the matrix or the grain boundaries. The mechanism for absorbing vibration energy could be considered as dislocation slip. A higher Zn content may result in more precipitates within Al grains or on the grain boundaries, consequently, dislocation is more difficult to slip and the intergranular fracture occurs. The 83Zn specimen shows a typical eutectoid structure of alternate alpha-Al and beta-Zn layers. The phase boundary sliding between alpha and beta can significantly dissipate vibration energy. However, this eutectoid structure possesses poor crack propagation resistance and thus inferior vibration life.
The 7Zn and 83Zn samples are chosen to examine the effect of cooling rate on vibration properties. Results show that for both 7Zn and 83Zn, a higher cooling rate will lead to a greater damping capacity and the WQ specimens possesses longer vibration life under constant force conditions. As for constant initial deflection conditions, the WQ samples of 7Zn and the AC of 83Zn exhibit better vibration fracture resistance. The amount and distribution of the precipitates influenced by cooling rate may account for those phenomena.

中文摘要..........................................................................Ⅰ
英文摘要..........................................................................Ⅱ
誌謝..........................................................................Ⅳ
總目錄..........................................................................Ⅴ
表目錄..........................................................................Ⅶ
圖目錄..........................................................................Ⅷ

第一章  前言...........................................................................1
第二章  文獻回顧...........................................................................3
 2-1  振動特性...........................................................................3
  2-1-1  共振頻率...........................................................................3
  2-1-2  阻尼的影響...........................................................................4
  2-1-3  振動D-N曲線...........................................................................5
 2-2  裂縫傳播行為...........................................................................7
 2-3  Al-Zn合金之基本特性介紹...........................................................................7
  2-3-1  Zn含量效應...........................................................................9
  2-3-2  冷卻速率效應..........................................................................11
第三章  實驗方法..........................................................................17
 3-1  材料準備..........................................................................17
 3-2  金相組織觀察與微觀組織定量解析..........................................................................18
 3-3  拉伸試驗及硬度測試..........................................................................18
 3-4  振動破壞試驗..........................................................................19
  3-4-1  振動試片尺寸及設備..........................................................................19
  3-4-2  共振疲勞測試..........................................................................19
  3-4-3  裂縫路徑特徵與定量解析..........................................................................20
  3-4-4  對數衰減率量測..........................................................................21
第四章  實驗結果..........................................................................26
 4-1  Zn含量效應..........................................................................26
  4-1-1  微觀組織、機械性質與拉伸破斷面特徵..........................................................................26
  4-1-2  對數衰減率、D-N曲線特徵與共振壽命..........................................................................27
  4-1-3  裂縫、破斷面觀察與定量解析..........................................................................29
 4-2  冷卻速率效應..........................................................................31
  4-2-1  微觀組織、機械性質與拉伸破斷面特徵..........................................................................31
  4-2-2  對數衰減率、D-N曲線特徵與共振壽命..........................................................................32
  4-2-3  裂縫、破斷面觀察與定量解析..........................................................................33
第五章  討論..........................................................................68
 5-1  機械性質與材料微觀結構關係..........................................................................68
  5-1-1  Zn含量效應..........................................................................68
  5-1-2  冷卻速率效應..........................................................................69
 5-2  振動阻尼與材料微觀結構關係..........................................................................70
  5-2-1  Zn含量效應..........................................................................70
  5-2-2  冷卻速率效應..........................................................................71
 5-3  D-N曲線特徵..........................................................................72
 5-4  裂縫傳播路徑..........................................................................73
 5-5  共振壽命..........................................................................75
  5-5-1  Zn含量效應對共振壽命之影響..........................................................................75
  5-5-2  冷卻速率效應對共振壽命之影響..........................................................................76
  5-5-3  共振壽命與對數衰減率、降伏強度、裂縫轉折度     
以及沿晶破壞面積率之關係..........................................................................77
第六章  結論..........................................................................83

參考資料..........................................................................85
 
                                    

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