不同时效状态下Al-Zn-Mg-Zr-Sc合金的应力腐蚀行为
Stress Corrosion Behavior of Al-Zn-Mg-Zr-Sc Alloy in Different Aging States
摘 要
采用慢应变速率拉伸试验研究了单级和双级时效态Al-Zn-Mg-Zr-Sc合金在不同应变速率以及不同腐蚀介质条件下的应力腐蚀开裂(SCC)敏感性, 观察了断口形貌, 讨论了应变速率和时效状态对合金SCC敏感性的影响。结果表明: 应变速率和时效状态对合金SCC敏感性的影响很大, 低应变速率下合金的SCC敏感性指数均大于高应变速率下的; 单级时效态合金的应力腐蚀敏感性指数均大于双级时效态合金的; 合金经双级时效处理后, 晶界沉淀相粗化, 可有效降低吸附于晶界的氢原子浓度, 使合金的耐应力腐蚀性能提高。
时效工艺
应力腐蚀
应变速率
腐蚀介质
Al-Zn-Mg-Zr-Sc alloy
aging process
stress corrosion
strain rate
corrosion medium
Abstract
The stress corrosion cracking (SCC) susceptibility of Al-Zn-Mg-Zr-Sc alloy at single-stage and two-stage aging states was investigated by slow strain rate tension (SSRT) tests at different strain rates and corrosion mediums. The fracture morphology of the tested alloy was observed, and the effects of strain rate and aging state on SCC sensitivity of the tested alloy were discussed. The results show that strain rate and aging state had severe influences on SCC susceptibility of the tested alloy. At lower strain rate, the alloy was more sensitive to stress corrosion. SCC susceptibility index of single-stage aged alloy was larger than that of two-stage aged alloy. After two-stage aging treatment, the coarsening of precipitates at the grain boundaries could effectively reduce the concentration of hydrogen atoms adsorption on grain boundary and increase the stress corrosion resistance of the alloy.
中图分类号 TG1 DOI 10.11973/jxgccl201611020
所属栏目 材料性能及应用
基金项目 湖南省教育厅科学研究项目(14C0379)
收稿日期 2016/1/30
修改稿日期 2016/9/22
网络出版日期
作者单位点击查看
备注聂辉文(1968-), 女, 湖南娄底人, 教授, 硕士。
引用该论文: NIE Hui-wen,ZENG Xiao-ling,NIE Jun-hong,WEI Li-li. Stress Corrosion Behavior of Al-Zn-Mg-Zr-Sc Alloy in Different Aging States[J]. Materials for mechancial engineering, 2016, 40(11): 98～102
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[J]. 机械工程材料, 2016, 40(11): 98～102
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参考文献
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【2】SENKOV O N, SHAGIEV M R, SENKOVA S V, et al. Precipitation of Al3(Sc, Zr) particles in an Al-Zn-Mg-Cu-Sc-Zr alloy during conventional solution heat treatment and its effect on tensile properties［J］. Acta Materialia, 2008, 56 (15): 3723-3738.
【3】DESCHAMPS A, TEXIERB G, RINGEVAL S, et al. Influence of cooling rate on the precipitation microstructure in a medium strength Al-Zn-Mg alloy［J］. Materials Science and Engineering A, 2009, 501(1/2): 133-139.
【4】JAMES C, WILLIAMS J C, STARKE E A. Progress in structural materials for aerospace systems［J］. Acta Materiala, 2003, 51(19): 5775-5799.
【5】李文斌, 潘清林, 肖艳苹, 等. 含钪 Al-Zn-Cu-Mg-Zr合金的腐蚀行为和电化学阻抗谱特征［J］. 中南大学学报(自然科学版), 2011, 42(9): 2642-2650.
【6】李文斌, 潘清林, 邹亮, 等. 含Sc的超高强Al-Zn-Cu-Mg-Zr合金的晶间腐蚀和剥落腐蚀行为［J］. 航空材料学报, 2008,28(1): 53-58.
【7】肖静, 尹志民, 黄继武.微量钪对Al-Zn-Mg-Mn-Zr合金组织与性能的影响［J］. 中南大学学报(自然科学版), 2008, 39(5): 975-979.
【8】谢优华. Zr对超高强铝合金铸态组织和晶粒度的影响［J］. 中国有色金属学报, 2002, 12(3): 130-134.
【9】何昌德,任建平,徐兵,等. 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.
【10】黄元春,朱弘源,肖政兵. 时效工艺对3003铝合金阴极箔组织、比电容和表面腐蚀形貌的影响［J］. 机械工程材料,2013,37(1): 25-28, 46.
【11】SEAMANS G M. Evidence for crack-arrest markings on intregranular stress corrosion fracture surfaces in Al-Zn-Mg alloys［J］. Metallurgical and Materials Transactions A, 1980, 11(5): 846-850.
【12】HARDWICK D A, THOMPSON A W, BERNSTEIN I M. Effect of copper content and microstructure on the hydrogen embrittlement of Al-6Zn-2Mg alloys［J］. Metallurgical and Materials Transactions A, 1983, 14(12): 2517-2526.
【13】NAJJAR D, MAGNIN T, WARNER T J. Influence of critical surface defects and localized competition between anodic dissolution and hydrogen effects during stress corrosion cracking of a 7050 aluminium alloy［J］. Materials Science and Engineering A, 1997, 238(2): 293-302.
【14】马少华,回丽,许良,等. 空气环境对预腐蚀2XXX系铝合金疲劳性能的影响［J］. 机械工程材料,2015,39(3): 65-70.
【15】李文斌, 潘清林, 刘俊生,等. 含Sc超高强Al-Zn-Mg-Cu-Zr合金的回归再时效处理制度［J］. 中国有色金属学报, 2009, 19(9): 1533-1538.
【16】张新明, 李慧中, 陈明安. 热处理对2519铝合金应力腐蚀开裂敏感性的影响［J］. 中国有色金属学报, 2006, 16(10): 1743-1748.
【17】肖艳萍. 含Sc超高强Al-Zn-Mg-Cu-Zr合金的均匀化和腐蚀行为研究［D］. 长沙: 中南大学, 2010.
【18】蒙多尔福 L F. 铝合金的组织与性能［M］. 王祝堂译. 北京: 冶金工业出版社, 1976.
【19】GALVELE J R, de MIHELI M S. Mechanism of intergranular corrosion of Al-Cu alloys［J］. Corrosion Science, 1970, 10 (11): 795-807.
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