| 7AXX铝合金的热处理工艺 |
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| 引用本文： | 张显峰,陆政,高文理,卓伟佳,陈龙.7AXX铝合金的热处理工艺[J].金属热处理,2012(2):65-69. |
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| 作者姓名： | 张显峰 陆政 高文理 卓伟佳 陈龙 |
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| 作者单位： | 北京航空材料研究院;湖南大学材料科学与工程学院 |
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| 摘 要： | 采用正交设计试验法研究了7AXX铝合金热处理工艺,结果表明:固溶温度为470℃保温时间为1 h时合金中的过剩相已得到充分溶解。双级时效中对于材料布氏硬度值的影响因子先后顺序应为:终时效温度、终时效时间、预时效时间、预时效温度。7AXX铝合金双级时效的四因素中终时效温度是影响最终性能的主要因素,随着合金终时效温度的升高材料硬度降低。经470℃×1 h固溶+110℃×4 h+150℃×8 h热处理后,合金抗拉强度为750.27 MPa;屈服强度为562.57 MPa;断后伸长率为26.43%。
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| 关 键 词： | 7AXX铝合金 热处理 双级时效 力学性能 |
Heat treatment process of 7AXX aluminum alloy |
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| ZHANG Xian-feng,LU Zheng,GAO Wen-li,ZHUO Wei-jia,CHEN Long.Heat treatment process of 7AXX aluminum alloy[J].Heat Treatment of Metals,2012(2):65-69. |
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| Authors: | ZHANG Xian-feng LU Zheng GAO Wen-li ZHUO Wei-jia CHEN Long |
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| Affiliation: | 1.Beijing Institute of Aeronautical Materials,Beijing 100095,China;2.College of Materials Science and Engineering,Hunan University,Changsha Hunan 410082,China) |
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| Abstract: | The heat treatment process of 7AXX aluminum alloy was studied using orthogonal design experiment.The results indicate that after solid solution treatments of 470 ℃×1 h,the precipitate particles of second phases decrease obviously and solute into the matrix alloy.The affecting hardness factors from strong to weak in the following order were found: second-step aging temperature,second-step aging time,first-step aging time and first-step aging temperature.The second step aging temperature is the key factor in double aging parameters,which mainly determine the final properties of 7AXX alloy.With the second-step aging temperature increasing,the alloy hardness is reduced.The reasonable heat treatment process of 7AXX alloy is two-stage aging,namely 110 ℃ for 4 hours followed by 150 ℃ for 8 h,and the ultimate tensile strength of 7AXX aluminum alloy is 750.27 MPa,the yield strength reaches 562.57 MPa,as well as the ductility reaches 26.43 %. |
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| Keywords: | 7AXX alloy heat treatment two-step aging mechanical property |
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