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研究生：	許鎮安 Hsu, Chen-An
論文名稱：	以快速凝固霧化法與粉末冶金製作Mg-Cu-Gd金屬玻璃塊材及其性質探討 Study of the Processing and Mechanical Properties of the Mg-Cu-Gd Bulk Metallic Glass Synthesized by Rapid-Solidifying Atomization and consolidated by Powder Metallurgy
指導教授：	曹紀元 Tsao, Chi-Yuan
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：	2011
畢業學年度：	99
語文別：	中文
論文頁數：	143
中文關鍵詞：	噴覆成型、鎂基、玻璃金屬粉末、非晶質、結晶活化能
外文關鍵詞：	Spray forming, Mg-based, metallic glasses powder, amorphous, activation energy
相關次數：	點閱：108 下載：7
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本篇研究使用具有快速冷卻效果的氣體霧化法製程來製備Mg-Cu-Gd玻璃金屬粉末。基於希望製備出來的粉末不受腔體其他材料之汙染，故另外設計一容器用於蒐集粉末並在其中灌入液態氮，以達非晶質所需的冷卻速率，由於有許多困難需要克服，此部分佔本研究目前大部分時間，目前將噴覆出來的粉末成功蒐集率達63%。所噴覆出的Mg-Cu-Gd玻璃金屬粉末粒徑主要約在40~60 μm。利用X光繞射分析(XRD)來檢測所噴覆出的材料之結構，並確定為非晶質材料。熱差式掃描分析(DSC)檢測此材料之上下區的玻璃轉換溫度及結晶溫度，而等溫熱差式掃描分析用來決定此材料在不同持溫溫度的潛伏時間，並計算其結晶活化能。此塊狀玻璃金屬的玻璃形成能力由Trg及γ等參數來做比較。Nano-TA則使用來進一步印證熱差式掃描分析(DSC)之結果，並觀察粉末表面在吸熱，結晶後之變化。掃描式(SEM)顯微鏡以及其附屬EDS觀察其微結構及化學組成，其組成為Mg66.2Cu24.3Gd9.5。在不同位置的微硬度由維氏硬度試驗檢測並同時檢測。
將得到的Mg66.2Cu24.3Gd9.5金屬玻璃粉末做熱壓成型，再接著進行擠型。探討其受到壓力及不同擠型比時材料內部的改變，並將擠型出來的材料進行室溫壓縮測試，得到其壓縮強度。

The Mg-Cu-Gd metallic glass powders was synthesized by the RSA (Rapid-Solidifying Atomization), a rapid solidification process. A container is designed for keep the powders pure form other materials in chamber, liquid nitrogen is injected into the container for reach the cooling rate to get amorphous structure, this part occupy the most time so far because of many problems to conquer, the best collection of powders now is 63%. The average size of spray-formed Mg-Cu-Gd metallic glass powder is 40~60 μm. The degree of crystallization and structure was determined by X-Ray Diffraction analyses, which shows amorphous structure. Differential Scanning Calorimeter analyses were performed to establish the glass transition and crystallization temperatures of the spray-formed Mg-Cu-Gd metallic glass powders. Isothermal DSC was also performed to determine the incubation times at various temperatures and its activation energy. The GFA (Glass Forming Ability) was determined with various glass forming criteria such as Trg and γ. Micro-TA is used to proof the correct of DSC and observe the surface of powders after the heating and crystallization. Microstructures and chemical compositions were characterized and analyzed by SEM and EDS, which has composition of Mg66.2Cu24.3Gd9.5. MHV hardnesses at different locations were measured by micro-Vickers hardness tester.
The Mg66.2Cu24.3Gd9.5 metallic glass powders were hot pressed to consolidate, the extrusion with extrusion ratio 9 and 36 were followed. To discuss the influence of pressure and extrusion ratio. And compression test at room temperature were tested to get compressive strength.

摘要	I
Abstract	II
致謝	III
第1章、 前言	1
1-1 塊狀金屬玻璃特性	1
1-2 材料選擇	2
1-3 製程選擇	2
第2章、 文獻回顧與理論基礎	4
2-1 塊狀金屬玻璃(BMG,Bulk metallic glasses)之歷史	4
2-2 金屬玻璃製造方法	5
2-2-1 噴覆成型Spray Forming	5
2-2-2 噴射鑄造	7
2-2-3 薄帶製作	8
2-2-4 粉末法	9
2-2-5 常溫均質變型BMG	10
2-3 金屬玻璃的形成	11
2-4 玻璃形成能力(glass forming ability, GFA)	13
2-5 熱分析理論	15
2-5-1 非恆溫熱分析	16
2-6 擠型形式與分析理論	17
2-7 機械性質	19
2-7-1 微硬度	19
2-7-2 韌性	19
2-7-3 室溫壓縮性質	20
2-8 應力誘發結晶(stress-induced crystallization)	21
第3章、 實驗步驟與分析參數及條件	22
3-1 製備RSA(Rapid Solidifying Atomization)之Metallic Glass Powders	22
3-2 X光繞射X-Ray diffraction (XRD) 之結構鑑定	23
3-3 Differential Scanning Calorimeter (DSC)	23
3-4 Micro-TA	24
3-5 SEM、EDS成份鑑定	24
3-6 微硬度Micro-hardness	24
3-7 熱壓	25
3-8 背向式擠型	25
3-9 室溫壓縮試驗	27
第4章、 結果與討論	29
4-1 RSA (Rapid Solidifying Atomization)製作出之Metallic Glass Powders	29
4-1-1 ICP/EDS成份鑑定及金相觀察	29
4-1-2 XRD之結構鑑定	30
4-1-3 DSC、結晶活化能及玻璃形成能力參數	30
4-1-4 Micro-TA	32
4-2 Mg-Cu-Gd金屬玻璃粉末熱壓	34
4-3 Mg-Cu-Gd金屬玻璃熱壓塊材擠型	34
4-4 Mg-Cu-Gd金屬玻璃擠型塊材之室溫壓縮	37
4-5 Mg-Cu-Gd金屬玻璃擠型塊材之微硬度測試	38
第5章、 結論	40
引用文獻	43

                                    

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