臺灣博碩士論文加值系統

本文探討以機械合金法合成之球磨粉末的非晶質化行為和以真空熱壓成型法將Ni57Zr20Ti20Si3非晶質合金粉末熱壓為非晶質合金塊材的可行性，研究結果顯示經五小時機械合金化處理後，Ni57Zr20Ti23-xTMx(TM=Ge、Pb、Sn；x=1、3、5)球磨粉末之結構皆為具寬廣過冷液態區之完全非晶質粉末，其中之Ni57Zr20Ti18Pb5非晶質合金粉末之寬廣過冷液態區ΔT更高達111K；對ΔT=88K之Ni57Zr20Ti20Si3非晶質合金粉末進行之真空熱壓研究，在773K時，施以1.2GPa的壓力並同時持溫30分鐘後，可形成直徑10mm、厚度1mm的Ni57Zr20Ti20Si3非晶質合金塊材，其緻密度經SEM觀察顯示最大孔隙度小於3μm。

The purpose of this study was to investigate of Ni57Zr20Ti23-xTMx (X=1、3、5；TM=Ge、Sn、Pb) powders amorphized by mechanically alloyed and the feasibility of fabricating amorphous Ni57Zr20Ti20Si3 powders consolidation by vacuum hot pressing. After 5 hours milled, Ni57Zr20Ti23-xTMx(X=1、3、5；TM=Ge、Sn、Pb) were prepared successfully amorphous powders successfully and these powders exhibited wide supercooled liquid region. Ni57Zr20Ti18Pb5 amorphous powder revealed the highest ΔT and the value is 111K. After 5 hours milled, Ni57Zr20Ti20Si3 powders were amorphous and exhibited a wide supercooled liquid region of 88 K before crystallization. As-milled Ni57Zr20Ti20Si3 amorphous powders were prepared as successfully bulk metallic glasses by vacuum hot pressing. The diameter of bulk amorphous sample is up to 10mm ,and 1mm height. And maximum porosity is smaller than 3μm measured by SEM.

目錄
目錄……………………………………………………………………….Ⅰ
表目錄…………………………………………………………………….Ⅲ
圖目錄…………………………………………………………………….Ⅳ
中文摘要………………………………………………………………….Ⅷ
英文摘要………………………………………………………………….Ⅸ
第一章 前言………………………………………………..………….…1
第二章 文獻回顧……………………..…………………………………...3
2.1 塊狀非晶質合金的發展過程………………………………3
2.2 塊狀非晶質合金之玻璃形成能力…………………………3
2.3 塊狀非晶質合的製備………………..……………………..5
(A)凝固法………………………………………………..5
(B)固化法………………………………………………..6
2.4 塊狀非晶質合金的特質……………………………………9
2.4-1機械性質…………………………………………..9
2.4-2磁性性質………………………………………….10
2.5 塊狀非晶質合的應用……………………………………..11
第三章 實驗步驟……………………….………………..………………31
3.1 機械合金處理……………………………………………..31
3.2 真空熱壓處理……………………………………………..32
3.3 特性檢測…………………………………………………..32
3.3-1 X-ray繞射分析………………………………..33
3.3-2 DSC熱分析……………………………………33
3.3-2 掃描式電子顯微鏡﹝SEM﹞觀察……………33
3.3-4 硬度測試………………………………………34
第四章 實驗結果……………………….……………………………..…39
4.1 鎳基非晶質粉末特性檢測………………………………..39
4.1-1 Ni57Zr20Ti23-xGex﹝X=1、3、5﹞……………..39
4.1-2 Ni57Zr20Ti23-xPbx﹝X=1、3、5﹞…..…………41
4.1-3 Ni57Zr20Ti23-xSnx﹝X=1、3、5﹞……………..42
4.2 Ni57Zr20Ti20Si3非晶質合金塊材製備………….…………..43
第五章 討論…………………………….……………………………..…46
5.1 過冷液態區………………………………………………..46
5.2 結晶化反應………………………………………………..48
第六章 結論…………………………….……………………………..…51

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