臺灣博碩士論文加值系統

本研究中所使用的材料為鎂-鋰-鋁-鋅作為基本成份並添加微量鈧金屬之合金，對LAZ1141+0.1wt%Sc與LAZ1191+0.2wt%Sc鎂合金進行冷加工以及自然時效處理等製程，並在實驗中使用了軋延機、OM、Vickers硬度機、拉伸試驗機等儀器完成所需的製程及觀察各製程所產生之微結構與機械性質上的變化。
實驗結果顯示，兩種材料皆能藉由冷加工處理來達到強化，且在冷加工量20％之製程中，其降伏、抗拉強度所提升的效果最為明顯。如果對LAZ1141+0.1wt%Sc施予更大的加工量，其強度不會有所提升但其延伸率將會逐漸增加；另外，由於發現LAZ1191+0.2wt%Sc中析出的α相較LAZ1141+0.1wt%Sc來得粗大許多，所以其在降伏、抗拉強度上的表現也較為出色。經由冷加工能夠使LAZ1141+0.1wt%Sc及LAZ1191+0.2wt%Sc硬度達到提升，且經過冷加工後，使得藉由自然時效處理的尖峰時效(peak aging)由原先的第2個小時延遲到第4個小時才出現，因此推測冷加工對此材料具有抑制析出的效果。

The alloy design and aging treatment are used to strengthen the Mg-Li alloys. Based on the Mg-Li-Al-Zn alloy composition, by changing the different amount of Al and Sc addition. On LAZ1141+0.1 wt% Sc and LAZ1191+0.2 wt% Sc alloys were cold work and the natural aging process, and used in the experiment rolling machine, OM, Vickers hardness, tensile testing machine and other equipment to complete the necessary and observation of process produced by the process of microstructure and mechanical properties of the changes.
Experimental results show that, both materials can be strengthen by cold rolling, and in 20% of cold rolling, the yield and tensile strength are the most obvious effect of elevated. If lend a greater processing capacity with LAZ1141+0.1 wt% Sc, its strength has not improved but the elongation will be gradually increased. In addition, we find the α-phase in LAZ1191+0.2wt%Sc more bigger than LAZ1141+0.1wt%Sc, so the yield and tensile strength performance are also more outstanding. Through the cold-rolling can make LAZ1141+0.1 wt% Sc and LAZ1191+0.2 wt% Sc hardness increase, and after cold-working, by the natural aging of the peak aging from the second hour to the fourth hour to appear, in that case, speculated that cold-working of this material has the effect of inhibiting precipitation.

第一章 前言 1
1-1 前言 1
1-2 研究動機 2
第二章 文獻回顧 3
2-1 簡介 3
2-1-1 高比強度/比剛性 3
2-1-2 熱傳導散熱性 3
2-1-3 電磁波遮蔽性 4
2-1-4 再回收性 4
2-1-5 制振能高 5
2-1-6 重量最輕的結構材 5
2-2 鎂合金之成分與命名 5
2-3 合金元素的添加對鎂合金之影響 6
2-3-1 常見之合金元素 6
2-3-1-1 鋁(Al) 7
2-3-1-2 鋅(Zn) 7
2-3-1-3 錳(Mn) 7
2-3-1-4 鋰(Li) 8
2-3-1-5 鋯(Zr) 8
2-3-1-6 矽(Si) 8
2-3-1-7 鈣(Ca) 9
2-3-1-8 稀土元素(RE) 9
2-3-2 其他微量的添加元素 9
2-3-2-1 鈹(Be) 9
2-3-2-2 鈧(Sc) 10
第三章 研究方法及其步驟 15
3-1 實驗材料 15
3-1-1 LAZ1141+0.1Sc合金 15
3-1-2 LAZ1191+0.2Sc合金 15
3-2 實驗流程 15
3-3顯微組織觀察 16
3-4 室溫冷軋延(Room Temperature Cold Rolling, CR) 16
3-5 熱處理 17
3-5-1 均質化處理 17
3-5-2 時效處理 17
3-6 XRD分析 17
3-7 硬度測試(Microvickers Hardness Test) 18
3-8 拉伸實驗 18
第四章 結果與討論 23
LAZ1141+0.1Sc及LAZ1191+0.2Sc鎂合金 23
4-1 合金顯微組織觀察 23
4-1-1 LAZ1141+0.1wt%Sc合金顯微組織 23
4-1-2 LAZ1191+0.2wt%Sc合金顯微組織 24
4-2 合金之X光繞射分析 25
4-2-1 LAZ1141及LAZ1191原鑄造材之XRD繞射分析 25
4-2-2 LAZ1141及LAZ1191固溶處理（淬水）之XRD繞射分析 25
4-2-3 LAZ1141及LAZ1191固溶處理（空冷）之XRD繞射分析 26
4-3 合金之機械性質 27
4-3-1 LAZ1141及LAZ1191原鑄造材之機械性質 27
4-3-2 LAZ1141及LAZ1191 固溶後(淬水)之機械性質 27
4-3-3 LAZ1141及LAZ1191 固溶後(空冷)之機械性質 28
第五章 結論 61
參考文獻 63

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