微量元素Cr、Mn對Al-Mg-Si合金之微結構及機械性質的影響

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研究生：	吳佳鴻 Jia-hong Wu
論文名稱：	微量元素Cr、Mn對Al-Mg-Si合金之微結構及機械性質的影響 Effect of trace Cr and Mn addition on microstructure and mechanical properties of Al-Mg-Si alloys
指導教授：	李雄 Shyong Lee
口試委員:
學位類別：	碩士 Master
系所名稱：	工學院 - 機械工程學系 Department of Mechanical Engineering
畢業學年度：	100
語文別：	中文
論文頁數：	92
中文關鍵詞：	Cr 、6061 、Mn 、T6熱處理。、均質化
外文關鍵詞：	homogenization, Cr, 6061, T6 heat treatment., Mn
相關次數：	點閱：17 下載：0
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本研究針對Al-Mg-Si 6061鋁合金添加微量元素Cr、Mn進行探討，所設計之三種合金6061、6061+Cr及6061+Mn鋁合金藉由熔煉爐鑄造，一批以550˚C/24h、爐冷的方式進行均質化處理，另外一批不均質化處理。這兩批分別進行450˚C熱鍛、鍛壓量70%再作T6熱處理（固溶520˚C/2h，時效167 ˚C/24h）。探討不同微量元素添加及T6處理後的機械性質以及顯微組織。
實驗結果顯示，6061、6061+Cr及6061+Mn鋁合金經由T6處理後硬度皆有明顯的提升，而強度方面在添加Cr 0.3%及Mn 0.7%時有最大值。而且已均質化之合金其強度皆小於未作均質化之合金。

The effects of trace elements chromium (Cr) and manganese (Mn) addition on aluminum-magnesium-silicon alloys were investigated. The alloys of interest are AA6061. Alloys design of the casted 6061, 6061+Cr and 6061+Mn aluminum alloys by melting furnace. The alloys were homogenizated at 550˚C for 24hrs and furnace cooling. After hot forging process, the alloys were solid solution treated at 520˚C for 2 hrs and then aged at 167˚C for 24hrs; Mechanical properties test results are reports. Moreover, the morphologies of casted and T6-heat treated after hot forging were observed by optics microscope (OM).
Results indicated that after T6 treatment, the hardness of 6061, 6061+Cr and 6061+Mn aluminum alloys increase obviously. 6061-Cr0.3% has a maximum strength among 6061-Cr x wt% (x=0.1, 0.3, 0.4, 0.5). 6061-Mn 0.7% has a maximum strength among 6061-Mn y wt% (y=0.1, 0.2, 0.5, 0.7, 0.9, 1.1). The strength of homogenized alloys are lower than non-homogenized alloys.

摘要.............................................i
Abstract.............................................ii
誌謝.............................................iii
目錄.............................................v
表目錄.............................................ix
圖目錄.............................................x
第一章 緒論.............................................1
1-1 前言.............................................1
1-2 研究動機與目的.............................................2
第二章 基礎原理與文獻回顧.............................................4
2-1 鋁合金材料特性.............................................4
2-2 熱處理.............................................5
2-3強化機構.............................................7
2-3-1細晶強化.............................................7
2-3-2加工硬化.............................................7
2-3-3固溶強化.............................................8
2-3-4析出強化.............................................9
2-4 Al-Mg-Si鋁合金.............................................9
2-4-1 Al-Mg-Si鋁合金簡介.............................................9
2-4-2 Al-Mg-Si之析出硬化.............................................10
2-4-3 Al-Mg-Si之時效析出機構.............................................11
2-5 Cr、Mn元素特性.............................................12
第三章 實驗方法與設備.............................................16
3-1 實驗材料.............................................16
3-1-1 熔煉合金.............................................16
3-1-2 澆鑄合金.............................................17
3-1-3 火花發射分光儀.............................................17
3-1-4 試件製作.............................................18
3-2 均質化處理.............................................18
3-3 高溫鍛壓.............................................18
3-4 T6處理.............................................19
3-5 硬度測試.............................................19
3-6 拉伸測試.............................................20
3-7 金相觀察.............................................21
第四章 實驗結果與討論.............................................33
4-1 鋁合金熔煉結果.............................................33
4-2 均質化處理.............................................34
4-3 硬度分析.............................................35
4-3-1 鑄材無均質化的合金之硬度分析.............................................35
4-3-2 鑄材無均質化的合金經熱壓後之硬度分析.............................................35
4-3-3 鑄材經均質化的合金之硬度分析.............................................36
4-3-4 鑄材經均質化的合金經熱壓後之硬度分析.............................................37
4-3-5 T6熱處理後之硬度分析.............................................37
4-4 拉伸試驗.............................................39
4-4-1 微量元素Cr添加之機械性質.............................................39
4-4-2 添加Cr作均質化後之機械性質.............................................40
4-4-3 微量元素Mn添加之機械性質.............................................40
4-4-4 添加Mn作均質化後之機械性質.............................................41
4-5金相分析.............................................42
4-5-1 6061合金及Cr、Mn元素添加之鑄造原材金相分析.............................................42
4-5-2 6061合金及Cr、Mn元素添加以熱鍛、時效後之金相分析.............................................43
第五章 結論.............................................84
參考文獻.............................................85

                                

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