李萍,吴广善,魏学峰,王薄笑天,严思梁,薛克敏.高压扭转对Al-Zn-Mg-Cu-Zr合金抗应力腐蚀性能影响[J].稀有金属材料与工程,2019,48(9):2981~2986.[Li Ping,Wu Guangshan,Wei Xuefeng,Wang Boxiaotain,Yan Siliang,Xue Kemin.Effect of high pressure torsion on stress corrosion resistance of Al-Zn-Mg-Cu-Zr aluminum alloy[J].Rare Metal Materials and Engineering,2019,48(9):2981~2986.]
高压扭转对Al-Zn-Mg-Cu-Zr合金抗应力腐蚀性能影响
投稿时间:2018-05-24??修订日期:2018-06-23
中文关键词:??Al-Zn-Mg-Cu-Zr合金??高压扭转??电化学腐蚀??抗应力腐蚀
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
??????在400 ℃下对铸态Al-Zn-Mg-Cu-Zr合金进行压强为1GPa的高压扭转和热处理实验,并利用金相显微镜、电化学工作站、慢应变速率拉伸机测试初始及变形试样的显微组织、电化学腐蚀性能及抗应力腐蚀性能。结果表明,高压扭转通过调控晶粒和第二相的尺寸与分布,可以同时提升7系铝合金的抗拉强度和抗应力腐蚀性能。铸态合金由于晶界处团聚的粗大第二相持续腐蚀,导致明显的晶间腐蚀及较差的抗应力腐蚀性能。0.5圈变形后第二相破碎及含量减少导致试样腐蚀敏感性降低,同时晶粒细化能减小面滑移而增大均值滑移模式,使HPT变形后试样的抗应力腐蚀性能显着提升。2圈变形后试样为尺寸更加细小的均匀细晶组织,其均值滑移模式相比于0.5圈变形试样进一步增强,但在剧烈点蚀与应力集中的共同作用下,抗应力腐蚀性能略有降低。
Effect of high pressure torsion on stress corrosion resistance of Al-Zn-Mg-Cu-Zr aluminum alloy
英文关键词:Al-Zn-Mg-Cu-Zr aluminium alloy??high pressure torsion??electrochemical corrosion??stress corrosion resistance
英文摘要:
??????High pressure torsion (HPT) experiment followed with heat treatment were carried out on as-received Al-Zn-Mg-Cu-Zr alloy at 400 ℃ under the pressure of 1 GPa. Optical microscope, electrochemical workstation and slow strain rate tensile machine were used for microstructure observation, electrochemical corrosion and stress corrosion resistance test for the as-received and HPT processed samples respectively. The results show that HPT processing can improve the tensile strength and stress corrosion resistance by modifying the size and distribution of grains and second phases. The second phases agglomerated at the grain boundary corrode continuously, which leads to obvious intergranular corrosion and weak stress corrosion resistance of the as-received alloy. After 0.5 turn of HPT processing, the fragmentation and content reduction of second phase lead to the decrease of corrosion sensitivity, at the same time, the planar slip reduces and homogeneous slip mode increases due to grain refinement, which synthetically results in a significant improvement of the stress corrosion resistance. The HPT processed sample with 2 turns has finer grains with uniform distribution, which leads to the further increases of homogeneous slip mode compared with 0.5 turn, but under the interaction of intense pitting and stress concentration, the resistance to stress corrosion slightly decreases.
作者单位E-mail
李萍?合肥工业大学?xuekm0721@sina.com?
吴广善?合肥工业大学??
魏学峰?合肥工业大学??
王薄笑天?合肥工业大学??
严思梁?合肥工业大学??
薛克敏?合肥工业大学?xuekm0721@sina.com?
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