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研究生:江圳陵
論文名稱:鋯基及鈀基塊狀非晶質合金之超塑性研究
論文名稱(外文):Superplasticity in Zr and Pd Based Bulk Metallic Glasses
指導教授:朱瑾朱瑾引用關係
學位類別:碩士
校院名稱:國立海洋大學
系所名稱:材料工程研究所
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:英文
論文頁數:88
中文關鍵詞:塊狀非晶質合金超塑性過冷液體區間
外文關鍵詞:bulk metallic glasssuperplasticitysupercooled liguid region
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本實驗主要是在探討塊狀非晶質合金在過冷液體區間的塑性行為探討,玻璃轉換溫度及結晶溫度對鈀基及鋯基非晶質合金其分別為590K、675K和670K、768K,對於鋯基非晶質合金在應變速率為10-2sec-1及溫度在700k時可以得到最大的延伸率(~800%),應變速率敏感指數(m)~0.9。而鈀基非晶質合金在應變速率為8×10-4sec-1、溫度700K下可以得到壓縮應變為0.9且其應變速率敏感指數(m)趨近於1,當增加應變速率時其流應力也會相對的增加而應變速率敏感指數(m)將會減少。應變速率和操作溫度為在過冷液體區間鈀基和鋯基變形行為的兩個重要因素,使用XRD及TEM去觀察試片變形後仍為非晶質狀態,在下述章節中將針對壓縮及拉伸超塑性性質加以討論。

In the present study, compressive and tensile deformation behaviors of bulk amorphous Pd40Ni40P20 and Zr55Al10Cu30Ni5 alloy have been characterized in the supercooled liquid region. Glass transition and crystallization temperatures are 590K and 675K, respectively, for Pd-based sample whereas those are 670K and 768K, respectively, for Zr-based sample. A maximum tensile elongation of ~800% is obtained in Zr-based alloy under an initial strain rate of 10-2sec-1 at 700K with the strain rate sensitivity, m value, measured to be ~0.9. A compressive strain of greater than 0.9 is obtained for Pd-based alloy under an initial strain rate of 8×10-4sec-1 at 640K with the maximum m value approaching unity. The flow stress increased with increasing strain rate while m value decreased with increasing strain rate. The strain rate and temperature play important roles in affecting deformation behavior of bulk Pd-based and Zr-based metallic glasses in the supercooled liquid region. Using the XRD and TEM, the deformed sample is still amorphous phase. Superplastic-like compressive and tensile properties will be presented and discussed in light of the microstructure/crystal structure results.

I. Introduction 1
II. Background 3
A. Development of Bulk Metallic Glasses 3
B. Glass-Forming Ability of Bulk Metallic Glasses 4
C. Production of Bulk Metallic Glasses
1. Solidification. 8
2. Consolidation 11
D. Mechanical Properties of Bulk Metallic Glasses 11
E. Superplasticity of Bulk Metallic Glasses 17
F. Applications 18
III. Experimental Procedure 24
A. Alloy Sample Preparation 24
B. Tensile & Compressive Tests 24
C. Material Characterizations 29
IV. Results and Discussion 34
A. Pd-based Metallic Glass — Compressive Test 34
1. Crystal Structure 34
2. Thermal Property 36
3. Mechanical Property 36
4. TEM Analysis 50
B. Zr-based Metallic Glass — Tensile Test 54
1. Crystal Structure 54
2. Thermal Property 54
3. Tensile Properties 54
C. Zr-based Metallic Glass — Compressive Test 77
1. Crystal Structure 77
2. Thermal Property 77
3.Compressive Properties 77
V. Summary 85
References 86

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