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％.
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 1 2 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%.
参考文献
| [1] | 刘龙飞;姜炳春;赵俊;卢立伟.冲击载荷下AZ31镁合金的变形行为和组织演变[J].机械工程材料,2015(1):24-28. |
| [2] | 张蓉;罗裴.AZ61镁合金的热压缩变形行为及组织演变[J].机械工程材料,2014(8):11-15,43. |
| [3] | Yoshihito Kawamura;Kentaro Hayashi;Akihisa Inoue.Rapidly Solidified Powder Metallurgy Mg_(97)Zn_1Y_2 Alloys with Excellent Tensile Yield Strength above 600 MPa[J].Materials transactions,20017(7):1172-1176. |
| [4] | Xu, C.;Zheng, M.Y.;Xu, S.W.;Wu, K.;Wang, E.D.;Kamado, S.;Wang, G.J.;Lv, X.Y..Ultra high-strength Mg-Gd-Y-Zn-Zr alloy sheets processed by large-strain hot rolling and ageing[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2012:93-98. |
| [5] | 郑梁 .Zn及变形工艺对Mg-6Gd-3Y-0.5Zr合金微观组织、织构及力学性能的影响[D].中南大学,2011. |
| [6] | 张松;袁广银;卢晨;丁文江.长周期结构增强镁合金的研究进展[J].材料导报,2008(2):61-63,81. |
| [7] | 高岩 .Mg-Y-Gd-Zn-Zr镁合金组织、性能及其蠕变行为研究[D].上海交通大学,2009. |
| [8] | K. Hagihara;N. Yokotani;Y. Umakoshi.Plastic deformation behavior of Mg_(12)YZn with 18R long-period stacking ordered structure[J].Intermetallics,20102(2):267-276. |
| [9] | Y.M. Zhu;A.J. Morton;J.F. Nie.The 18R and 14H long-period stacking ordered structures in Mg-Y-Zn alloys[J].Acta materialia,20108(8):2936-2947. |
| [10] | Y.M. Zhu;A.J. Morton;J.F. Nie.Growth and transformation mechanisms of 18R and 14H in Mg-Y-Zn alloys[J].Acta materialia,201219(19):6562-6572. |
| [11] | Xu, S.W.;Kamado, S.;Honma, T..Effect of homogenization on microstructures and mechanical properties of hot compressed Mg-9Al-1Zn alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20116(6):2385-2393. |
| [12] | X.H. Shao;Z.Q. Yang;X.L. Ma.Strengthening and toughening mechanisms in Mg-Zn-Y alloy with a long period stacking ordered structure[J].Acta materialia,201014(14):4760-4771. |
| [13] | Michiaki Yamasaki;Kenji Hashimoto;Koji Hagihara.Effect of multimodal microstructure evolution on mechanical properties of Mg-Zn-Y extruded alloy[J].Acta materialia,20119(9):3646-3658. |
| [14] | C. Xu;M.Y. Zheng;S.W. Xu.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: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2012:40-44. |
| [15] | M. Matsuda;S. Ii;Y. Kawamura.Interaction between long period stacking order phase and deformation twin in rapidly solidified Mg_(97)Zn_1Y_2 alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20041/2(1/2):447-452. |
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