本實驗乃分成兩部分來進行，第一部份的主要目的只是為了更加確定添加些許的硼元素是否真的可以如鄭宇庭[14]所做的Mg65Cu25Y10合金加硼實驗一樣，使熱性質變的良好，以後更加篤定添加硼元素的用處是否有效提升。本論文以Mg65Ni25Y10合金系統為基準，有別於鄭宇庭的Mg65Cu25Y10合金系統，各別添加硼元素去取代銅元素 (1 at%、3 at%、5 at%)，藉由小原子填入其自由體積(free volume)內，去提升它的堆積密度。也觀察其熱性質變化是否也跟鄭宇庭結論相吻合。

第二部份，本實驗大膽將鎂元素降至58 at%，甚至更低，而大原子釹Nd的元素向上提升至11 at%或更多，有別於大家常用的65 at %、25 at %、10 at %為主要的比例成分，來觀察其過冷液體區間

This thesis is divided into two parts. The main purpose of the first part is only to confirm further whether adding B can really improve the glass forming ability (GFA) and thermal stability. It is recently suggested that the addition of the even smaller sized B (0.08 nm) in the Mg65Cu25Y10 alloys to a certain level can further enhance GFA and provide the chance in fabricating larger bulk amorphous billet. The current study extends the concept of adding B to the Mg65Ni25Y10 based alloy, including the replacement of Ni by 1-5 at % (1, 3, and 5 at %) using the arc melting and melt spinning methods.

The second part, this experiment drops magnesium element to 58 at% boldly, even lower, and the big element atom neodymium (Nd) improves to 11 at% or more upwards, different from everybody commonly used 65 at %, 25 at % , 10 at % as the main proportion composition , then to observe whether its supercooled liquid region

目錄

目錄..............……….......................….........................................................................I
表目錄................………..................….....................................................................IV
圖目錄….......……………….………………………...................................................V
Abstract..............……….......................…..................................................................X
摘要..............……….......................….....................................................................XII
第一章 前言..........................…………………………………………........................1
1-1 簡介………….....………………………..…………………....................1
1-2 非晶質鎂合金的崛起…………..……………………..……...................2
1-3 多元成分的影響..………...……………………………………………...3
1-4 研究主旨目的…...……………………………………………………….4
第二章 理論背景...................…………………………………………........................6
2-1 非晶質合金發展歷程….......…………………………….......................6
2-2 非晶質合金種類……………..………….……………….......................8
2-3 非晶質合金的製程方法.………………..……………….......................9
2-4 影響非晶質合金之形成條件因素...............….........…………………10
2-4-1 玻璃形成能力…….............................……….………………..10
2-4-2 冷卻速率…………..........................…..……………………….11
2-4-3 合金原子間的鍵結與晶體結構特性...........…….…………….12
2-4-4 共晶成分…………..........................…..……………………….12
2-5 非晶質合金的熱力學性…..………........................….....…………….12
2-5-1 非晶質之介穩態…..…………….....……………..…………….13
2-5-2 玻璃轉換溫度(Tg)...................................................................14
2-5-3 簡化玻璃轉換溫度(Trg)..............................………..………....14
2-6 非晶質合金的優異特性..........................................………..………...15
2-6-1 機械性質...............................……………………...…….....….16
2-6-2 化學性質.......….........................…………………….………...16
2-6-3 物理性質.......….........................…………………….………...17
2-7 熱力學結晶分析.............................…………………………………...17
2-7-1 恆溫分析法...........................……………………...……...…...18
2-7-2 非恆溫分析法.......….................................………….………...19
2-7-2-1 一般之非恆溫分析法.......…..................…….………...19
2-7-2-2 修正之非恆溫分析法.......…..................…….………...22
第三章 實驗步驟.............................................………………...…………………......25
3-1 薄帶製作方法..............................….......…………..………………….25
3-1-1 實驗材料配製....................................…………….…………...25
3-1-2 電弧熔煉(Arc-Melting)………………………………..……….25
3-1-3熔煉(Melt spinning)..................................………….………….26
3-2 多元合金基本分析................................…………………….………..27
3-2-1 XRD繞射分析................................….………………………...27
3-2-2 DSC熱分析………………………………………………….......27
3-2-3 SEM與EPMA定量分析………………………………...……...28
3-2-4 微硬度機分析…………………………………………...……...28
第四章 實驗結果.………………............................………………………...…….......29
4-1 試片外觀…..……….........…….....…………………….…….….........29
4-2 SEM觀察與EDS分析.....……….....……….....……….....………......30
4-3 X光繞射分析……….........…….....…………………….…….…........30
4-4 非恆溫熱力學DSC分析.....……….....……….....……….....………..31
4-5 硬度分析.....……….....……….....……….....……….....……….....…..34
第五章 分析與討論…….....…………..................……………..…………....……......37
5-1添加硼元素對合金的影響...…….....………………..….…….….........37
5-2熱力學和動力學分析...…….....………………………...…….….........38
5-2-1 Kissinger做圖分析............... .....……….....…………….…......39
5-2-2修正之非恆溫分析法................................….………….……...40
5-3鎂銅與鎂鎳系列非晶質合金比較...........................................…..…...41
5-4 Tg與Hv值的關係....................................................................…..…...43
第六章 結論……....…………………..................……………..…………....…….......44
參考文獻............................................………………………………….........…….....46
表..........................................................……………………………………………....50
圖.............................................................…………………………………….………66






表目錄

表1-1 非晶質合金之特性...........................………………...……...……..............50
表1-2 非晶質鎂基系統……………………………………………………………..51
表2-1 最初非晶質合金之系統分類表.......................…………………………….52
表2-2 多元系塊狀非晶質合金種類與發展歷程表.........…...….…...……………53
表2-3 鎂、鋯、鈀基等非晶質合金的Tg、Tm、Tl表.....................………………....54
表2-4 鎂、鋯、鈀基等非晶質合金的Tg/ Tm、Tg/ Tl、Zmax、

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