臺灣博碩士論文加值系統

本研究主要探討以機械合金法（mechanical alloying）之方式在Cu-Zr-Ti非晶質合金系統中添加Sn元素，以XRD、SEM、DSC觀察粉末在機械合金的過程中微觀組織的變化與相穩定性。根據實驗所得結果，在經過機械合金法處理5小時後，各Cu-Zr-Ti-Sn之合金組成粉末可以形成完全非晶質相，當使用DSC熱分析儀來研究非晶質合金粉末在固定加熱速率下的熱穩定行為，結果顯示本研究所選取的成分經球磨後所得之非晶質相粉末可以在結晶反應發生前觀察到寬廣的過冷液態區△T（△T=Tx-Tg）存在，其最大△T值出現在合金系統Cu46Zr30Ti20Sn4中（93K），固在Cu-Zr-Ti非晶質合金系統中添加微量的Sn元素可增進其玻璃形成能力（GFA）。

This study examined the effect of Sn element addition on the Cu-Zr-Ti amorphous alloys by mechanical alloying technique. The microstructural evolution during mechanical alloying of the mixed powders was investigated by both X-ray diffraction and scanning electron microscopy (SEM).The phase stabilities of the as-milled powders were studied by DSC measurement. According to the result, after 5 hours of milling, the composition of Cu-Zr-Ti-Sn alloys were all amorphization. The thermal stability of the Cu-Zr-Ti-Sn amorphous powder was also investigated by differential scanning calorimeter (DSC). As the results demonstrated, the amorphous powder were found to exhibit a wide supercooled liquid region before crystallization. The temperature interval of the supercooled liquid region was defined by the difference between Tg and Tx. The highest value of △T was found to exhibit at Cu46Zr30Ti20Sn4 alloys system (93K). Finally, the small addition of Sn element significantly improved the glass forming ability (GFA) of Cu-Zr-Ti amorphous alloys.

CHINESE ABRACT.……………………………………..…….I
ABSTRACT………..…………………………………………..II
TABLE OF CONTENT…………..………..………………….III
LIST OF TABLES……………………..……………………...VI
LIST OF FIGURES…………..………………………………VII
1.INTRODUCTION…………...……………………………...1
2.LITERATURE REVIEW…………………………………...5
2.1Amorphous Alloys….………………….………………..5
2.1.1Type of Amorphous Alloys….……………………..5
2.2Characteristics of Amorphous Allloys…………………..6
2.2.1Mechanical Property…………...………………….7
2.2.2Chemical Property—Corrosion Resistance……….8
2.2.3Soft Magnetism Property ………...……………….8
2.2.4Others Important Property..……………………….9
2.3Thermodynamics Of Glassy Alloys……………...……...9
2.3.1Amorphization is Balance Metastable State………9
2.3.2Glass Transition Temperature……………….…...10
2.3.3Reduced Glass Transition Temperature..................11
2.4Cu-based Amorphous Alloys…………………….…..12
2.4.1 Cu-Zr…………………………………………….14
2.4.2 Cu-P..…………………………………………….15
2.4.3 Cu-Zr-Ti…………………………………………15
2.4.4 Cu-Hf-Ti…...……………………………………16
2.4.5 Cu-Zr-Ni...………………………………………16
2.4.6 Cu-Zr-Ti-Ni..……………………………………16
2.4.7 Cu-Zr-Ti-Be.…………………….………………17
2.4.8 Cu-Zr-Ti-Y..……………………………….……18
2.4.9 Cu-Ti-Ni-Si-B.…………………………..………19
2.4.10 Cu-Ti-Ni-Zr-Sn...……..…………………..……19
2.4.11 Cu-Ti-Zr-Ni-Si-Sn.…….………………....……20
3.Experimental Procedures...…..…………………………….21
3.1Process Of Mechanical Alloying…....…………………21
3.2Examination Of Powder characters....…………………21
3.2.1 X-ray Diffraction Analysis………………………21
3.2.2 Thermal Analysis.……………………………….22
3.2.3 Scanning Electron Microscopic Observation.......22
4.Results And Discussions…………………...……...……….23
4.1X-Ray Analysis……..………………………...………..23
4.2DSC Thermal Analysis.……......………………………24
4.3SEM Observation……........……………………………24
4.4Amorphization Reaction…….…………………………26
4.5Supercooled Liquid Region..…..………………………27
4.6Crystallization….........…………………………………30

5.Conclusions………………………….....………………….33

6.References ……………………………………..………….35

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