7050铝合金双级双峰时效沉淀相的析出过程及作用
Precipitation Process and Effect of Precipitated Phases of 7050 Aluminum Alloy Two-Stage Double Peak Aging
摘 要
研究了7050铝合金双级双峰时效的第二级时效时沉淀相的析出过程及作用。结果表明: 合金在第二级时效的硬化第一峰主要由细小、均匀的GP区贡献, 而第二峰由晶内细小的η′相与粗大GP区共同作用, 后者的强化效果要优于前者的; 第二峰峰值时析出的η′相细小均匀地分布于晶内, 间距非常小, 体积分数较大, GP区粗大; 随着时效进一步深入, 晶界上的η′相开始聚集粗化, 开始转变为平稳的η相, GP区消失。
双级双峰时效
沉淀相析出
7050 aluminum alloy
two-stage double peak aging
precipitated phase precipitation
Abstract
The precipitation process and effect of precipitated phases at second-stage aging of 7050 aluminum alloy two-stage double peak aging were studied. The results show that the first-peak of alloy second-stage aging was hardened mainly by fine and uniform GP zone and the second-peak was hardened by fine intragranular η′phases and bulky GP zone, the strengthening effect of the latter was better than the former. The η′ phases which precipitated at peak value of second-stage peak distributed in intragranular uniformly, and η′ phases had very small spacing and large volume fraction, the GP zone was bulky. The η′ phases started to gather and coarsen then change to steady η phases with aging going along further, the GP zone disppeared.
中图分类号 TG146.2
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收稿日期 2010/6/12
修改稿日期 2010/11/23
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备注何昌德(1967-), 男, 浙江台州人, 高级工程师, 学士。
引用该论文: HE Chang-de,REN Jian-ping,XU Bing,YANG Pu-xin. Precipitation Process and Effect of Precipitated Phases of 7050 Aluminum Alloy Two-Stage Double Peak Aging[J]. Materials for mechancial engineering, 2011, 35(6): 38～41
何昌德,任建平,徐兵,杨普新. 7050铝合金双级双峰时效沉淀相的析出过程及作用[J]. 机械工程材料, 2011, 35(6): 38～41
被引情况:
【1】李 慧,陈 涛,赵路远,黄 俊,吴玉程, "T651态7075铝合金的显微组织与拉伸断裂机制",机械工程材料 40, 38-43(2016)
【2】聂辉文,曾小玲,聂俊红,韦莉莉, "不同时效状态下Al-Zn-Mg-Zr-Sc合金的应力腐蚀行为",机械工程材料 40, 98-102(2016)
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参考文献
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【3】MUKHOPADHYAY A K, YANG Q B, SINGH S R. The influence of zirconium on the early stages of aging of a termary Al-Zn-Mg-Cu alloy[J].Acta Metall Mater, 1994, 42(9):3083-3091.
【4】RAMGOPAL T, GOUMA P I, GRANKEL G S. Role of grain-boundary precipitates and solute-depleted zone on the intergranular corrosion of alloy 7150[J].Corrosion, 2002, 58(8):687-697.
【5】ROBSON J D. Microstructural evolution in aluminum alloy 7050 during processing[J].Materials Science and Engineering A, 2004, 382:112-121.
【6】VASUDEVAN A K, DOHERTY R D. Aluminum alloys-contemporary research and application[M].Boston: Academic Press, 1989.
【7】SONG R G, ZHANG Q Z. Heat treatment optimization for 7175 aluminum alloy by genetic algorithm[J].Materials Science and Engineering C, 2001, 17:133-136.
【8】阎大京.时效制度对7475和7050铝合金应力腐蚀及剥层腐蚀性能的影响[J].材料工程, 1993, 4(2):13-16.
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【11】KNANO M, ARAKI I, CUI Q. Precipitation behavior of 7000 alloys during retrogression and reaging treatment[J].Mater Sci and Technol, 1994, 10(7):599-602.
【12】LIN Gao-yong, ZHANG Hui. Influences of processing routine on mechanical properties and structures of 7A04 aluminum alloy thick-plates[J].Trans Nonferrous Met Soc China, 2003, 13:809-813.
【13】SRIVATSAN T S. Microstructure, tensile properties and fracture behavior of aluminum alloy 7150[J].Mater Sci Eng, 1992, 27:4772-4781.
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