近幾十年來，多元非晶質合金由於具有一些獨特的物理特性及化學特性，已引起眾多學者的研究與探討。而在這些多元非晶質系統中，鎂基非晶質合金因具有高強度重量比，低玻璃轉換溫度及輕密度等特性。因此在輕金屬應用中，佔有相當大的發展潛力及優勢。

本研究以在鎂基非晶質合金之中，具有高玻璃形成能力的Mg65Cu25Y10非晶質為母材，藉由添加小原子尺寸的硼探討對母材熱性質、非晶質化及奈米結晶行為的影響。在實驗流程上，首先利用小型電弧爐及高週波爐熔鍊得到厚度約100~200

The glass forming ability (GFA) of the lightweight Mg65Cu25Y10 alloy has been widely studied. This alloy contains a medium sized Mg matrix (0.16 nm in atomic radius), a small sized Cu (0.14 nm) and a large sized Y (0.18 nm). The glass transition temperature Tg, supercooled temperature range

Content..................................................................................................................................... i
Tables List................................................................................................................................ iii
Figures List.............................................................................................................................. iv
Abstract ..................................................................................................................................... 1
1 Introduction and literature review..................................................................................... 4
1.1 Introduction……...................................................................................................... 4
1.2 The development of Mg-based amorphous alloys.................................................... 4
1.3 Influence of quaternary additions on Mg-based alloys............................................ 5
1.4 The purpose of this study......................................................................................... 6
2 Background....................................................................................................................... 7
2.1 The evolution of amorphous alloys.......................................................................... 7
2.2 The systems of glassy metals................................................................................... 8
2.3 The dominant factors for the glass forming ability.................................................. 9
2.4 The main empirical rules for the synthesization of amorphous alloys......….….... 10
2.4.1 Bonding parameter for Mg-based BMGs………………………………......... 13
2.5 Characterization of amorphous alloys………….......................... ................................... 14
2.5.1 Mechanical properties........................ ............................................................. 15
2.5.2 Magnetic properties……………………. ........................................................ 15
2.5.3 Chemical properties.......................................................................................... 15
2.5.4 Other properties and behavior of bulk amorphous alloys................................ 15
2.6 Crystallization transformation of amorphous…………………………………………... 16
2.6.1 The Kissinger plot............................................................................................ 16
2.6.2 Modified kinetics of non-isothermal crystallization kinetics…....................... 17
2.6.3 Isothermal analysis for the crystallization kinetics of amorphous alloys… ..20
2.6.4 The Arrhenius plot........................................................................................ 21
3 Experimental procedures............................................................................ .................... 22
3.1 Materials................................................................................................................. 22
3.2 Synthesization methods.......................................................................................... 22
3.2.1 Arc melting.................................................................................................... 22
3.2.2 Melt spinning................................................................................................. 23
3.3 Phase identification by XRD.................................................................................. 24
3.4 SEM/EPMA observations……………………………........................................ ..24
3.5 Microhardness testing…………………………………………............................ 24
3.6 Density measurement.............................................................................................. 25
3.7 DSC thermal stability analysis..... ......................................................................... 25
3.8 Microstructure characterizations............................................................................ 26
4. Experimental Results....................................................................................................... 27
4.1 Specimens prepartion............................................................................................. 27
4.2 X-ray diffraction analyses...................................................................................... 27
4.3 SEM/EPMA observations...................................................................................... 28
4.4 Microhardness tests………………………………......... ...................................... 29
4.5 Density measurements........................................... …......... .................................. 29
4.6 Thermal analyses............................................... ......... .......................................... 30
4.6.1 Non-isothermal analyses and kinetics............ ................................ ..............30
4.6.2 Kissinger plots for non-isothermal analyses................................... ...............32
4.6.3 Modified Kissinger plots for non-isothermal analyses......................... .. ......32
4.6.4 Isothermal analyses and kinetics.......... …………………………………… 34
4.7 TEM observations………………………………………………………………. 36
5. Discussions…………………………………………………………………………….. 37
5.1 The effect of the boron element…………………………………………………. 37
5.2 XRD analyses……………………………………………………………………. 38
5.3 Thermodynamics and kinetics analyses…………………………………………. 39
6. Conclusions……………………………………………………………………………. 42
References................................................................................................................................. 44
Tables........................................................................................................................................ 47
Figures....................................................................................................................................... 56

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