臺灣博碩士論文加值系統

摘要
鎂基非晶質合金在所有非晶質系統中有極佳之比強度。本實
驗中，由於噴覆成型製程比起傳統鑄造方式有較高之冷卻速率，已
成功製備鎂銅釔塊狀非晶質合金塊材，此塊材直徑為150mm，厚度
10mm，重達650 克，而平均孔隙率為11%。由XRD 及DSC 結果
顯示，其非晶質之程度類似於經由旋焠激冷製程製作之非晶質薄
帶，然而此塊材之銅、釔成分隨著距沈積基板愈近而遞增，原因為
銅、釔相較於鎂為原子量較大之元素。TEM 證明噴覆塊材大部分
為非晶相，亦發現有因製程產生應變而誘發雙晶現象。藉由TMA
所量測之過冷液體範圍與相同升溫速率之DSC 相較，結果範圍縮
小約20K，原因為TMA 試驗中應力誘發奈米晶所致。噴覆塊材之
體收縮率亦比薄帶要來的小，可有效增加尺寸熱穩定性。噴覆非晶
質塊材之強度達269 MPa，伸長量約2.6 %。

Abstract
Mg-based amorphous alloys exhibit highest specific strength among
bulk metallic glass systems. In this study, a bulk Mg65Cu25Y10 deposit
was produced successfully via spray forming process with higher cooling
rate than conventional mold casting route. The deposit is 150mm in
diameter, 10 mm in thickness and 650 g in weight. The average porosity
is about 10%. The XRD and DSC results of the deposit look similar to
that obtained from corresponding amorphous melt-spun ribbon. However,
the measured composition of deposit varies slightly with the distance
from substrate, which attribute to gravity effect of relative heavy element,
like Y and Cu. The deposit is almost amorphous phase from TEM image
and diffraction pattern. Twins are induced with deformation for the
unique of spray forming process. The supercooled liquid region of the
deposit determined from TMA technique is about 20K smaller than that
obtained from DSC trace due to the stress induced nanocrystallzation
occurred in the former. In addition, the volume reduction of deposit
during TMA test was also smaller than that of ribbon and shows better
dimension stability. In compressive test，the strength of bulk amorphous
alloys is about 269 MPa，strain is about 2.6 %.

總目錄
第一章前言........................................................1
第二章理論基礎及文獻回顧..........................................3
2-1 塊狀非晶質合金之沿革........................................3
2-2 塊狀非晶質合金之瓶頸........................................3
2-3 為何選用噴覆成型製程製備塊狀非晶質合金？ ....................4
2-3.1 噴覆成型製程原理......................................4
2-3.2 噴覆及沈積過程結晶相與非晶相形成之機制................6
2-4 非晶質合金形成之條件........................................8
2-4.1 非晶質合金系統........................................8
2-4.2 玻璃形成能力(Glass Forming Ability，GFA) .............8
2-4.3 非晶質合金的結晶.....................................11
2-4.4 Kissinger plot........................................11
2-5 非晶質合金製備方法.........................................12
2-6 非晶質合金特色.............................................13
2-6.1 機械性質.............................................14
2-6.2 磁性.................................................15
2-6.3 化學性質.............................................16
2-6.4 其他特殊性質.........................................16
第三章實驗步驟及方法..............................................17
3-1 材料製備...................................................18
3-1.1 電弧熔煉(Arc Melting) ...............................18
3-1.2 重複熔煉(Re-melting)................................18
3-2 實驗方法...................................................19
3-2.1 噴覆成型製程(Spray forming process) .................19
3-2.2 熔融旋淬(Melt spinning) .............................19
3-3 性質量測及分析.............................................19
3-3.1 X-ray 相鑑定(XRD) ....................................19
3-3.2 微結構觀察...........................................19
3-3.3 熱性質分析...........................................21
3-3.4 微硬度試驗...........................................22
3-3.5 熱機械性質...........................................22
3-3.5 動態機械性質.........................................23
3-3.7 壓縮試驗.............................................23
第四章結果與討論..................................................24
4-1 材料製備...................................................24
4-2 X-ray 相鑑定..............................................25
4-3 ICP / WDS 組成成分分析....................................26
IV
4-4 SEM / EPMA 微結構分析.....................................27
4-5 TEM 微觀結構與繞射圖......................................28
4-6 熱性質分析.................................................29
4-6.1 非恆溫分析...........................................29
4-6.2Kissinger plots.......................................31
4-7 體積變化率.................................................32
4-8 機械性質...................................................34
4-8.1 維式微硬度(Micro-hardness of Vickers indentation) ....34
4-8.2 動態機械性質.........................................35
4-8.3 壓縮試驗.............................................36
第五章結論.......................................................37
參考文獻..........................................................39

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