利用平行平面正碰撞方法产生的冲击波对Mg-Gd-Y与AZ31两种典型变形镁合金加载,并对回收后的材料进行准静态压缩实验,采用金相显微镜和透射电子显微镜进行微观组织分析.冲击波加载后,原始固溶态Mg-Gd-Y合金的屈服强度增加了21 MPa,而时效峰状态合金的屈服强度仅增加4 MPa,时效处理后产生的析出相β’使合金的屈服强度增加幅度明显减少;然而,AZ31镁合金的屈服强度增加了40 MPa.Mg-Gd-Y与AZ31镁合金的冲击波加载后力学响应的差异取决于冲击波过程中两者所具有的不同变形机制,冲击波变形后Mg-Gd-Y合金中的孪晶体积分数非常少,其变形机制以位错滑移为主.相比之下,冲击波加载后的AZ31合金中产生了大量孪晶,孪生是该合金的一种重要变形机制.孪晶界在后续再加载过程中成为位错滑移的障碍,从而导致AZ31镁合金表现出更为显著的冲击波强化效果.
参考文献
[1] | 张卫东.装甲材料的发展历程[J].国外坦克,2006(10):22. |
[2] | 王渠东,丁文江.镁合金研究开发现状与展望[J].世界有色金属,2004(07):8-11. |
[3] | Lou XY;Li M;Boger RK;Agnew SR;Wagoner RH .Hardening evolution of AZ31B Mg sheet[J].International Journal of Plasticity,2007(26):44-86. |
[4] | Marko Knezevic;Amanda Levinson;Ryan Harris;Raja K. Mishra;Roger D. Doherty;Surya R. Kalidindi .Deformation twinning in AZ31: Influence on strain hardening and texture evolution[J].Acta materialia,2010(19):6230-6242. |
[5] | Seong-Gu Hong;Sung Hyuk Park;Chong Soo Lee .Role of {10–12} twinning characteristics in the deformation behavior of a polycrystalline magnesium alloy[J].Acta materialia,2010(18):5873-5885. |
[6] | Zhang K;Ma M L;Li X G;Li Y J,Bing M F .Hot derormation behavior of Mg-7.22Gd-4 84Y-1 26Nd-0 58Zr magnesium alloy[J].Rare Metals,2011,30(01):87. |
[7] | 张家振,马志新,李德富.预变形对Mg-Gd-Y-Zr合金力学性能的影响[J].稀有金属,2008(04):522-525. |
[8] | LI Yongjun,ZHANG Kui,ZHANG Ya,LI Xinggang,MA Minglong.Microstructural evolution and mechanical properties of Mg-5Y-5Gd-xNd-0.5Zr magnesium alloys at different states[J].稀有金属(英文版),2010(03):317-322. |
[9] | 倪川皓,徐强,杨素媛,王富耻.超高速碰撞AZ31镁合金和纯铁靶板弹坑底部超细晶形成机制[J].稀有金属,2011(06):818-822. |
[10] | I. Ulacia;N.V. Dudamell;F. Galvez .Mechanical behavior and microstructural evolution of a Mg AZ31 sheet at dynamic strain rates[J].Acta materialia,2010(8):2988-2998. |
[11] | 张帆,谭成文,于晓东,马红磊,王富耻,才鸿年.应变率对Mg-Gd-Y合金断裂机制的影响[J].稀有金属,2011(05):662-666. |
[12] | Matthew T. Tucker;Mark F. Horstemeyer;Phillip M. Gullett .Anisotropic effects on the strain rate dependence of a wrought magnesium alloy[J].Scripta materialia,2009(3):182-185. |
[13] | Rokhlin L L.Magnesium Alloys Containing Rare Earth Metals[M].London:taylor and Francis,2003:245. |
[14] | 张景怀,唐定骧,张洪杰,王立民,王军,孟健.稀土元素在镁合金中的作用及其应用[J].稀有金属,2008(05):659-667. |
[15] | 何兰强,马鸣龙,李兴刚,李永军,张奎.Mg-9.0Y-3.0MM-0.6Zr合金均匀化热处理研究[J].稀有金属,2011(02):164-169. |
[16] | Gray Ⅲ G T.High Pressure Shock Compression of Solids[M].New York:springer-verlag,1993 |
[17] | J. F. Nie and B. C. Muddle .CHARACTERISATION OF STRENGTHENING PRECIPITATE PHASES IN A Mg-Y-Nd ALLOY[J].Acta materialia,2000(8):1691-1703. |
[18] | Asay J R;Shahinpoor M.High-Pressure Shock Compression of Solids[M].New York:springer-verlag,1992:187. |
[19] | A. ROHATGI;K. S. VECCHIO;G. T. GRAY .A METALLOGRAPHIC AND QUANTITATIVE ANALYSIS OF THE INFLUENCE OF STACKING FAULT ENERGY ON SHOCK- HARDENING IN Cu AND Cu-Al ALLOYS[J].Acta materialia,2001(3):427-438. |
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