臺灣博碩士論文加值系統

　　本研究選用Mg97Zn1Y2合金切屑作為球磨製程的初始材料，並結合等通道轉角擠製製備合金塊材。研究目的在探討球磨製程及等通道轉角擠製路道次對鎂-鋅-釔塊材合金之成形性、相變化、顯微組織、機械性質及抗腐蝕性質影響。
　　實驗結果顯示鑄造的Mg97Zn1Y2合金含有α-Mg及Mg12Y1Zn1相。以合金切屑進行球磨含有α-Mg、Mg93Zn2.8Y4.1的條狀物及Mg85Zn1Y14的顆粒，經過球磨Mg12Y1Zn1相分解。等通道轉角擠製後的合金塊材含有α-Mg、Mg93Zn1.2Y5.5的條狀物及氧化釔顆粒。其中以Bc路徑之等通道轉角擠製四道次有最好的硬度120 Hv及抗壓強度483MPa較傳統鑄造鎂-鋅-釔合金抗壓強度。

In this study, Mg97Zn1Y2 alloy chips were ball milled and then the milled powder was consolidated by equal channel angular extrusion (ECAE). The purpose of this study is to investigate the effects of ball milling process and equal channel angular extrusion on the formability, phase transformation, microstructure, mechanical properties and corrosion resistance of the consolidated alloy.

The experimental results show that the as-cast magnesium-zinc-yttrium alloy contains α-Mg and Mg12Y1Zn1 phase. Magnesium-zinc-yttrium alloy powder prepared by ball milling contains α-Mg, Mg93Zn2.8Y4.1 and Mg85Zn1Y14.The Mg12Y1Zn1 phase is decomposited during the milling process. Bulk magnesium-zinc-yttrium alloy consolidated by ECAE also contains α-Mg, Mg93Zn1.2Y5.5 and Y2O3. Among all of the ECAE consolidated samples, the one prepared using route Bc with four passes shows the highest hardness (120 Hv) and ultimate compressive strength (465 MPa), which is higher than that of the as-cast magnesium-zinc-yttrium alloy.

中文摘要 II
ABSTRACT III
致謝 IV
目錄 V
圖目錄 VIII
表目錄 XI
第一章 緒論 1
1.1 前言 1
1.2 研究動機與目的 2
第二章 文獻回顧 3
2.1 鎂及鎂合金簡介 3
2.1.1 添加合金元素對鎂合金影響 4
2.1.2 鎂-鋅-釔合金 5
2.2 機械球磨 7
2.2.1 金屬粉末的機械球磨過程 7
2.2.2 機械球磨的製程參數 10
2.2.3 機械球磨製備鎂合金 12
2.3 等通道轉角擠製 15
2.3.1 ECAE擠製路徑 16
2.3.2 ECAE粉末成形技術 19
2.3.3 ECAE粉末成形在鎂合金之應用 20
2.4 文獻回顧心得 25
第三章 實驗方法 26
3.1 實驗材料 27
3.2 材料製備 27
3.2.1 鑄造 29
3.2.2 球磨製程 30
3.2.3 等通道轉角擠製 33
3.3 材料試驗與分析 35
3.3.1 場發掃描式顯微鏡 35
3.3.2 X光繞射分析 35
3.3.3 熱差分析 36
3.3.4 粒徑分析 37
3.3.5 密度量測 37
3.3.6 硬度試驗 37
3.3.7 壓縮試驗 38
3.3.8 電化學極化曲線測試 39
3.3.9 浸泡試驗 40
第四章 結果與討論 41
4.1 鑄造合金分析 41
4.1.1 顯微組織觀察與X光繞射分析 41
4.2 粉末形貌與相分析 47
4.2.1 粉末形貌與粒徑分析 47
4.2.2 粉末結構分析 50
4.2.3 DTA分析 57
4.3 粉末經等通道轉角擠製後的顯微組織觀察及相之分析 59
4.3.1 X光繞射分析 59
4.3.2 EDS分析 62
4.3.3 顯微組織觀察 65
4.4 物理及機械性質分析 72
4.4.1 密度及孔隙率分析 72
4.4.2 硬度分析 73
4.4.3 壓縮測試分析 74
4.5 抗腐蝕分析 76
4.5.1 電化學 76
4.5.2 浸泡測試 78
第五章 結論 87
參考文獻 88

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