均匀化退火时间和轧制道次对镁钆钇锌锆合金组织及拉伸性能的影响
Effects of Homogenization Annealing Time and Rolling Passes on Microstructure and Tensile Properties of Mg-Gd-Y-Zn-Zr Alloy
摘 要
对铸态Mg-6Gd-3Y-1Zn-0.5Zr合金在510 ℃进行不同保温时间的均匀化退火处理, 之后再在450 ℃下进行1～5道次的轧制, 研究了均匀化退火时间和轧制道次对合金组织及拉伸性能的影响。结果表明: 与退火12 h的合金相比, 退火40 h合金中片层状LPSO相的数量明显增多, 这导致其强度和塑性较低; 随着轧制道次增加, 合金中的再结晶体积分数增大, 合金的强度和塑性逐渐提高; 合金在510 ℃退火40 h后再经5道次轧制后具有最佳的拉伸性能, 屈服强度为271 MPa, 抗拉强度为340 MPa, 伸长率为9.0%。
均匀化退火
轧制
拉伸性能
magnesium alloy
homogenization annealing
rolling
tensile property
Abstract
As-cast Mg-6Gd-3Y-1Zn-0.5Zr alloy was homogenization annealed at 510 ℃ for different holding time, and then rolled at 450 ℃ with 1-5 passes. The effects of homogenization annealing time and rolling passes on microstructure and tensile properties of the alloy were investigated. The results show that, comparison with the alloy being annealed for 12 h, the amount of lamellar LPSO phase in the alloy being annealed for 40 h was more, which leads to its strength and ductility were far less than those of the alloy being annealed for 12 h. With the increase of rolling passes, the volume fraction of recrystallized grains increased, accompanied by the improvement of strength and ductility. After being rolled at 450 ℃ for 5 passes, the alloy being annealed for 40 h exhibited the best tensile properties, with yield strength of 271 MPa, tensile strength of 340 MPa and elongation of 9.0%.
中图分类号 TG146.2 DOI 10.11973/jxgccl201607003
所属栏目 试验研究
基金项目
收稿日期 2015/6/23
修改稿日期 2016/4/27
网络出版日期
作者单位点击查看
备注宫敏利(1981-), 女, 陕西户县人, 讲师, 硕士。
引用该论文: GONG Min-li,LIU Chu-ming,ZHOU Xiao-jie. Effects of Homogenization Annealing Time and Rolling Passes on Microstructure and Tensile Properties of Mg-Gd-Y-Zn-Zr Alloy[J]. Materials for mechancial engineering, 2016, 40(7): 13～17
宫敏利,刘楚明,周小杰. 均匀化退火时间和轧制道次对镁钆钇锌锆合金组织及拉伸性能的影响[J]. 机械工程材料, 2016, 40(7): 13～17
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【7】张松, 袁广银, 卢晨, 等. 长周期结构增强镁合金的研究进展［J］.材料导报, 2008, 22(2): 61-63.
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【10】ZHU Y M, MORTON A J, NIE J F. The 18R and 14H long-period stacking ordered structures in Mg-Y-Zn alloys［J］. Acta Materialia, 2010, 58(8): 2936-2947.
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【13】SHAO X H, YANG Z Q, MA X L. Strengthening and toughening mechanisms in Mg-Zn-Y alloy with a long period stacking ordered structure［J］. Acta Materialia, 2010, 58(14): 4760-4771.
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【15】XU C, ZHENG M Y, XU S W, et al. Microstructure and mechanical properties of rolled sheets of Mg-Gd-Y-Zn-Zr alloy: as-cast versus as-homogenized［J］. Journal of Alloys and Compounds, 2012, 528: 40-44.
【16】MATSUDA M, LI S, KAWAMURA Y, et al. Interaction between long period stacking order phase and deformation twin in rapidly solidified Mg97Zn1Y2 alloy［J］. Materials Science & Engineering A, 2004, 386: 447-452.
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