双级固溶双级时效处理对7050铝合金组织与性能的影响
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摘要
通过硬度测试、电导率测试以及室温拉伸试验并结合光学显微镜(OM)、扫描电镜(SEM)、差示扫描量热法(DSC)等分析技术,研究了双级固溶(450℃,1 h+495℃,1 h)+双级时效(120℃,8 h+160℃,24 h)工艺对7050铝合金微观组织和性能的影响。结果表明:在其它条件相同的情况下,随着第二级固溶温度的升高,合金中粗大的第二相粒子更多地固溶到基体中,增强了固溶效果;随第二级时效时间的延长,合金出现了双峰时效现象。采用双级固溶+双级时效热处理工艺时,合金的综合性能优良,抗拉强度、伸长率、硬度分别为590 MPa、14.04%、191 HV。
The effects of two-step solution(450 ℃/1 h +495 ℃/1 h) and two-step aging(120 ℃/8 h +160 ℃/24 h)treatment on the microstructure and properties of 7050 Al alloys were investigated by hardness test, conductivity test and tensile test, and combined with the analysis technique of optical microscopy(OM), scanning electron microscopy(SEM),differential scanning calorimeter(DSC). The results show that when other conditions are the same, the second phase particles in the alloy are more solid solution to the matrix, and solid solution effect is enhanced with the increase of the second step solution temperature. The double peaks aging phenomenon in the alloy arises with the extension of the second step of aging time. When the two-stage solid solution and two-stage aging heat treatment process is adopted, the tensile strength, elongation,hardness of 7050 alloy are 590 MPa, 14.04% and 190 HV, respectively, and the comprehensive performance of 7050 Al alloy is optimal.
The effects of two-step solution(450 ℃/1 h +495 ℃/1 h) and two-step aging(120 ℃/8 h +160 ℃/24 h)treatment on the microstructure and properties of 7050 Al alloys were investigated by hardness test, conductivity test and tensile test, and combined with the analysis technique of optical microscopy(OM), scanning electron microscopy(SEM),differential scanning calorimeter(DSC). The results show that when other conditions are the same, the second phase particles in the alloy are more solid solution to the matrix, and solid solution effect is enhanced with the increase of the second step solution temperature. The double peaks aging phenomenon in the alloy arises with the extension of the second step of aging time. When the two-stage solid solution and two-stage aging heat treatment process is adopted, the tensile strength, elongation,hardness of 7050 alloy are 590 MPa, 14.04% and 190 HV, respectively, and the comprehensive performance of 7050 Al alloy is optimal.
引文
[1]宋仁国.高强度铝合金的研究现状及发展趋势[J].材料导报,2000(1):20-21.
[2]Heinz A,Haszler A,Keidel C E,et al.Recent development in aluminium alloys for aerospace applications[J].Materials Science and Engineering A,2000,280(1):102-107.
[3]李春梅,陈志谦,程南璞,等.超高强超高韧铝合金的热处理工艺研究[J].轻合金加工技术,2007(12):36-40.
[4]黄振宝,张新明,刘胜胆,等.固溶处理对高纯7055铝合金组织的影响[J].材料热处理学报,2006(3):54-59.
[5]张新明,游江海,黄振宝,等.固溶降温处理对7A50铝合金组织和性能的影响[J].稀有金属,2007(1):5-9.
[6]肖代红,陈康华,罗伟红.固溶热处理对AA7085铝合金组织与性能的影响[J].稀有金属材料与工程,2010(3):494-497.
[7]任建平,宋仁国.双级时效工艺对7050铝合金组织与性能的影响[J].轻工机械,2011(4):21-25.
[8]田福泉,崔建忠.双级时效对7050铝合金组织和性能的影响[J].中国有色金属学报,2006(6):958-963.
[9]张静,杨亮,左汝林.固溶时效工艺对7055铝合金组织和力学性能的影响[J].稀有金属材料与工程,2015(4):956-960.
[10]Li J,Liu W C,Yuan H,et al.Comparison of earing behavior between continuous cast and direct chill cast AA 5182aluminum alloys during cold rolling and annealing[J].J.Mater.Process.Technol.,2010,210(14):2007-2015.
[2]Heinz A,Haszler A,Keidel C E,et al.Recent development in aluminium alloys for aerospace applications[J].Materials Science and Engineering A,2000,280(1):102-107.
[3]李春梅,陈志谦,程南璞,等.超高强超高韧铝合金的热处理工艺研究[J].轻合金加工技术,2007(12):36-40.
[4]黄振宝,张新明,刘胜胆,等.固溶处理对高纯7055铝合金组织的影响[J].材料热处理学报,2006(3):54-59.
[5]张新明,游江海,黄振宝,等.固溶降温处理对7A50铝合金组织和性能的影响[J].稀有金属,2007(1):5-9.
[6]肖代红,陈康华,罗伟红.固溶热处理对AA7085铝合金组织与性能的影响[J].稀有金属材料与工程,2010(3):494-497.
[7]任建平,宋仁国.双级时效工艺对7050铝合金组织与性能的影响[J].轻工机械,2011(4):21-25.
[8]田福泉,崔建忠.双级时效对7050铝合金组织和性能的影响[J].中国有色金属学报,2006(6):958-963.
[9]张静,杨亮,左汝林.固溶时效工艺对7055铝合金组织和力学性能的影响[J].稀有金属材料与工程,2015(4):956-960.
[10]Li J,Liu W C,Yuan H,et al.Comparison of earing behavior between continuous cast and direct chill cast AA 5182aluminum alloys during cold rolling and annealing[J].J.Mater.Process.Technol.,2010,210(14):2007-2015.