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研究生:黃中佐
研究生(外文):Zhong-Zuo Huang
論文名稱:鋁合金高溫變形阻抗陡降臨界溫度之銅、矽及鎳效應探討
論文名稱(外文):Effect of Copper, Silicon, and Nickel on the Softening Temperature in Plastic Deformation Resistance of Al Alloys at Elevated Temperatures
指導教授:陳立輝陳立輝引用關係
指導教授(外文):Li-Hui Chen
學位類別:碩士
校院名稱:國立成功大學
系所名稱:材料科學及工程學系碩博士班
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2003
畢業學年度:91
語文別:中文
論文頁數:93
中文關鍵詞:鋁矽鋁銅鋁鎳
外文關鍵詞:AC8A2218Al-NiAl-CuAl-Si
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本研究以鋁-鎳合金(Al-Al3Ni)、鋁-矽系合金(Al-4Si,AC8A)、鋁-銅系合金(2218)等三種不同的合金系統探討第二相顆粒對鋁合金高溫變形阻抗及其陡降臨界溫度之影響,並以純鋁1070作為比對材。此外,本研究將自行配置Al-4Cu-4Ni-4Si-1Mg合金(簡稱4441),作進一步探討比較。
根據室溫到300 ℃拉伸試驗的結果可知,隨著溫度的升高,流應力都有下降的趨勢,而當測試溫度大於臨界溫度時,流應力急遽下降。此外,第二相顆粒包括晶出顆粒及析出顆粒對變形阻抗能力都會有提升的功用,而析出強化效應又較晶出相的散佈強化更能提高材料的高溫變形阻抗。
對陡降臨界溫度的提升而言,不論是晶出相顆粒或析出相顆粒,對臨界溫度都有提升的作用。在晶出相顆粒中,本研究發現矽晶與Al3Ni的添加均能導致臨界軟化溫度上升,且矽晶的效應較大。而析出相顆粒比晶出相顆粒更有效提升臨界軟化溫度。
Several commercial Al alloy systems, including Al-Al3Ni, Al-Si (Al-4Si and AC8A), Al-Cu (2218), were chosen in this study to investigate the plastic deformation resistance at elevated temperatures and the softening feature. Pure Al (1070) was also examined for comparison. In addition, an Al-4Cu-4Ni-4Si-1Mg, designated as 4441, was also prepared for understanding the combined effect of Cu, Ni, and Si.
According to the results of tensile tests from room temperature to 300oC, the flow stress of all the samples descends slightly before a critical temperature for a drastic drop in the strength (softening temperature). Second phase particles, including Si, Al3Ni, and precipitates, are able to improve the high temperature strength and rise the softening temperature. It can be found that the increasing effect of the precipitates on the softening temperature and the deformation resistance is more significant than Si and Al3Ni particles. However, Al alloys with the addition of Si particles exhibit a higher softening temperature than those with Al3Ni. Interestingly, large amount of Si and Al3Ni additions seems to have no effect on the critical temperature for softening.
Comparing AC8A to Al-4Si, the results indicate that adding small amount of the precipitation hardening elements (Cu, Mg) increases high temperature strength but not softening temperature. On the other hand, adding Al3Ni and Si particles into the precipitation hardening Al-Cu alloys is not capable of improving both the high temperature deformation resistance and softening temperature.
中文摘要……………………………………………………I
英文摘要……………………………………………………II
總目錄………………………………………………………III
表目錄………………………………………………………VI
圖目錄………………………………………………………VII
第一章 前言………………………………………………1
第二章 文獻回顧…………………………………………2
2-1 鋁-鎳合金之基本特性……………………………2
2-2 商用鋁-矽(-鎂)合金之基本特性……………3
2-3 商用鋁-銅(-鎂)合金之基本性質……………4
2-4 鋁合金高溫變形阻抗軟化現象……………………5
第三章 實驗過程…………………………………………13
3-1 材料準備……………………………………………13
3-2 實驗方法……………………………………………14
3-2-1 微組織觀察……………………………………14
3-2-2 X-ray相鑑定分析……………………………15
3-2-3 溫區拉伸測試…………………………………15
3-2-4 破斷面觀察……………………………………16
3-2-5 次表面觀察……………………………………16
第四章 實驗結果…………………………………………23
4-1 微觀組織觀察………………………………………23
4-1-1 1070合金………………………………………23
4-1-2 Al-Al3Ni合金………………………………23
4-1-3 Al-4Si合金……………………………………24
4-1-4 鋁-矽AC8A合金………………………………24
4-1-5 鋁-銅2218合金………………………………25
4-1-6 4441合金………………………………………25
4-2 純鋁1070之基本拉伸性質…………………………26
4-2-1 流應力對溫度之關係…………………………26
4-2-2 延伸率對溫度之關係…………………………26
4-3 Al-Al3Ni合金室溫到300 ℃拉伸性質…………27
4-3-1 抗拉強度與溫度之關係………………………27
4-3-2 相同應變量之流應力與溫度之關係…………27
4-3-3 總延伸率對溫度之關係………………………28
4-3-4 均勻延伸率對溫度之關係……………………29
4-3-5 室溫到300 ℃之拉伸變形破斷面觀察………29
4-3-6 室溫到300 ℃之拉伸變形次表面觀察………29
4-4 Al-4Si合金室溫到300℃拉伸性質………………29
4-4-1 抗拉強度對溫度之關係………………………30
4-4-2 相同應變量之流應力與溫度之關係…………30
4-4-3 總延伸率對溫度之關係………………………31
4-4-4 均勻延伸率對溫度之關係……………………31
4-4-5 室溫到300 ℃之拉伸變形次表面觀察………31
4-5 鋁矽合金AC8A室溫到300 ℃拉伸性質……………31
4-5-1 抗拉強度與溫度之關係………………………32
4-5-2 相同應變量之流應力與溫度之關係…………32
4-5-3 總延伸率對溫度之關係………………………33
4-5-4 均勻延伸率對溫度之關係……………………33
4-5-5 室溫到300 ℃之拉伸變形破斷面觀察………33
4-5-6 室溫到300 ℃之拉伸變形次表面觀察………34
4-6 Al-Cu合金2218室溫到300 ℃的拉伸性質………34
4-6-1 抗拉強度與溫度之關係………………………34
4-6-2 相同應變量之流應力與溫度之關係…………35
4-6-3 總延伸率對溫度之關係………………………35
4-6-4 均勻延伸率對溫度之關係……………………36
4-6-5 室溫到300 ℃之拉伸變形破斷面觀察………36
4-6-6 室溫到300 ℃之拉伸變形次表面觀察………36
4-7 4441合金室溫到300 ℃的拉伸性質………………37
4-7-1 流應力對溫度之關係…………………………37
4-7-2 延伸率對溫度之關係…………………………38
4-7-3 拉伸變形次表面觀察…………………………38
第五章 討論………………………………………………84
5-1 陡降臨界溫度與成分關係…………………………84
5-2 高溫阻抗與合金組成關係…………………………85
第六章 結論………………………………………………88
第七章 參考文獻…………………………………………89
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