7085铝合金的热处理工艺
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摘要
采用金相显微镜、扫描电镜、电子万能试验机等分析手段对在实验室熔铸的7085铝合金的铸态组织、均匀化退火组织、固溶处理后的组织、固溶时效后的力学性能及断口形貌进行了检测分析。结果表明,采取430℃×12 h+475℃×24 h的双级均匀化退火处理能够完全消除枝晶偏析,Zn原子完全溶解到基体中;在470℃固溶处理时,除少部分粗大第二相外,大部分第二相均回溶到基体中,固溶效果最好; 470℃×120 min固溶+120℃×24 h时效处理后合金的力学性能最佳,屈服强度、抗拉强度、伸长率分别为541 MPa、592 MPa、13. 85%,断口形貌为以穿晶断裂为主的混合型断裂。
The microstructure of as-cast,homogenization annealing and solution treatment of 7085 aluminum alloy prepared in laboratory,the mechanical properties and fracture morphology of the alloy after solution and aging were analyzed by means of metallographic microscope,scanning electron microscope and electronic universal testing machine. The results show that the two-stage homogenization heat treatment process of 430 ℃ × 12 h + 475 ℃ × 24 h can completely eliminate the dendritic segregation and Zn atoms can be completely dissolved into the matrix. Except for a few coarse second phases,the most second phase is redissolved into the matrix when solution temperature is 470 ℃,and the best solution effect can be obtained. After solution treated at 470 ℃ for 120 min and aged at 120 ℃ for 24 h,the mechanical properties is the best with a yield strength of 541 MPa,a tensile strength of 592 MPa,a productivity of 13. 85% and a fracture morphology of mixed fracture dominated by transgranular fracture.
The microstructure of as-cast,homogenization annealing and solution treatment of 7085 aluminum alloy prepared in laboratory,the mechanical properties and fracture morphology of the alloy after solution and aging were analyzed by means of metallographic microscope,scanning electron microscope and electronic universal testing machine. The results show that the two-stage homogenization heat treatment process of 430 ℃ × 12 h + 475 ℃ × 24 h can completely eliminate the dendritic segregation and Zn atoms can be completely dissolved into the matrix. Except for a few coarse second phases,the most second phase is redissolved into the matrix when solution temperature is 470 ℃,and the best solution effect can be obtained. After solution treated at 470 ℃ for 120 min and aged at 120 ℃ for 24 h,the mechanical properties is the best with a yield strength of 541 MPa,a tensile strength of 592 MPa,a productivity of 13. 85% and a fracture morphology of mixed fracture dominated by transgranular fracture.
引文
[1]王春华,张涛,尹红霞,等.时效处理对7075铝合金组织与性能的影响[J].金属热处理,2017,42(9):87-90.Wang Chunhua, Zhang Tao, Yin Hongxia, et al. Effect of aging treatment on microstructure and properties of 7075 aluminum alloy[J].Heat Treatment of Metals,2017,42(9):87-90.
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[10]周学浩,孙有平,张扬扬,等.均匀化处理对Al-Mg-Si-Cu合金铸态组织与性能的影响[J].金属热处理,2017,42(6):93-96.Zhou Xuehao,Sun Youping,Zhang Yangyang,et al. Effect of homogenizing treatment on microstructure and mechanical properties of as-cast Al-Mg-SiCu alloy[J]. Heat Treatment of Metals,2017,42(6):
[2]刘义伦,羿九火,杨大炼,等.固溶温度对7075铝合金组织及高周疲劳性能的影响[J].金属热处理,2016,41(3):1-7.Liu Yilun, Yi Jiuhuo, Yang Dalian, et al. Effects of solution temperature on microstructure and high cycle fatigue performance of 7075aluminum alloy[J]. Heat Treatment of Metals,2016,41(3):1-7.
[3]房洪杰,孙杰,刘慧,等.复合添加Cr、Mn、Ti对7136铝合金组织及力学性能的影响[J].金属热处理,2017,42(4):53-57.Fang Hongjie,Sun Jie,Liu Hui,et al. Effect of Cr,Mn,Ti content on microstructure and mechanical properties of 7136 aluminum alloy[J]. Heat Treatment of Metals,2017,42(4):53-57.
[4] Yang Qunying,Liu Wenyi,Zhang Zhiqing,et al. Hot deformation behavior and processing maps of AA7085 aluminum alloy[J]. Rare Metal Materials and Engineering,2018,47(2):409-415.
[5]张江斌,李承波,何克准,等.超厚7085铝合金板时效工艺优化[J].金属热处理,2018,43(1):179-183.Zhang Jiangbin,Li Chengbo,He Kezhun,et al. Optimization of aging process for ultra-thickness 7085 aluminum alloy plate[J]. Heat Treatment of Metals,2018,43(1):179-183.
[6]Li Dongfeng, Zhang Duanzheng, Liu Shengdan, et al. Dynamic recrystallization behavior of 7085 aluminum alloy during hot deformation[J]. Transactions of Nonferrous Metals Society of China,2016,26(6):1491-1497.
[7]孙杰,房洪杰,刘慧,等.微量稀土Ce对7085铝合金组织和性能影响[J].中国稀土学报,2017,35(4):501-507.Sun Jie,Fang Hongjie,Liu Hui,et al. Effect of trace rare earth Ce on microstructure and properties of 7085 aluminum alloy[J]. Journal of the Chinese Society of Rare Earths,2017,35(4):501-507.
[8]曲世永,李民,史春丽,等. Al-8. 0Zn-2. 3Cu-2. 0Mg-0. 2Zr铝合金的均匀化及固溶处理[J].金属热处理,2017,42(6):114-118.Qu Shiyong,Li Min,Shi Chunli,et al. Homogenizing and solution of Al-8. 0Zn-2. 3Cu-2. 0Mg-0. 2Zr aluminum alloy[J]. Heat Treatment of Metals,2017,42(6):114-118.
[9]房洪杰,孙杰,汪洪波,等.微量稀土元素Ce对7136铝合金微观组织和性能的影响[J].中国稀土学报,2016,34(3):313-319.Fang Hongjie,Sun Jie,Wang Hongbo,et al. Effects of trace of Ce element on microstructure and properties of 7136 aluminum alloy[J].Journal of the Chinese Society of Rare Earths,2016,34(3):313-319.
[10]周学浩,孙有平,张扬扬,等.均匀化处理对Al-Mg-Si-Cu合金铸态组织与性能的影响[J].金属热处理,2017,42(6):93-96.Zhou Xuehao,Sun Youping,Zhang Yangyang,et al. Effect of homogenizing treatment on microstructure and mechanical properties of as-cast Al-Mg-SiCu alloy[J]. Heat Treatment of Metals,2017,42(6):