通过时Mg-12Gd-3Y-0.5Zr合金进行单向拉伸试验,检验晶粒尺寸、温度和应变率对合金力学性能的影响.通过退火处理可以获得不同晶粒尺寸((9.63±0.69)～(94.24士2.41)μm)的试样,拉伸温度分别为20℃、-25℃和-50℃.当温度足够低时,塑性变形由滑移主导的变形方式向孪生主导过渡；同样的情况可在晶粒尺寸变大时发生.变形机制的转变导致Hall-Petch关系中斜率的变化.采用Zener-Hollomon参量来描述温度、应变率对孪生的综合影响.实验结果表明,随着Z参量的变大,孪生发生率增大；当Z值足够大时,变形机制发生转变.
参考文献
| [1] | Christian J W;Mahajan S .Deformation twinning[J].Progress in Materials Science,1995,39(1-2):1. |
| [2] | Mordike B L;Ebert T .Magnesium:Properties-applications-potential[J].Materials Science and Engineering,2001,302(01):37. |
| [3] | Y.N. Wang;J.C. Huang .The role of twinning and untwinning in yielding behavior in hot-extruded Mg-Al-Zn alloy[J].Acta materialia,2007(3):897-905. |
| [4] | X.L. Wu;N.R. Tao;Q.M. Wei .Microstructural evolution and formation of nanocrystalline intermetallic compound during surface mechanical attrition treatment of cobalt[J].Acta materialia,2007(17):5768-5779. |
| [5] | Wang JT;Yin DL;Liu JQ;Tao J;Su YL;Zhao X .Effect of grain size on mechanical property of Mg-3Al-1Zn alloy[J].Scripta materialia,2008(1):63-66. |
| [6] | Obara T;Yoshinga H;Morozumi S .{ 1122 } 《 (1) (1)23》 Slip system in magnesium systeme[J].Acta Metal],1973,21(07):845. |
| [7] | Rajesh Korla;Atul H. Chokshi .Strain-rate sensitivity and microstructural evolution in a Mg–Al–Zn alloy[J].Scripta materialia,2010(9):913-916. |
| [8] | Jain A;Agnew S .Modeling the temperature dependent effect of twinning on the behavior of magnesium alloy AZ31B sheet[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2007,462(1-2):29. |
| [9] | M. A. MEYERS;O. VOHRINGER;V. A. LUBARDA .THE ONSET OF TWINNING IN METALS: A CONSTITUTIVE DESCRIPTION[J].Acta materialia,2001(19):4025-4039. |
| [10] | 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. |
| [11] | Xiao G H;Tao N R;Lu K .Effect of strain,strain rate and temperature on deformation twinning in a Cu-Zn alloy[J].Scripta Materialia,2008,59(09):975. |
| [12] | Fatemi-Varzaneh S M;Zarei-Hanzaki A;Haghshenas M .A study on the effect of therrno-mechanical parameters on the deformation behavior of Mg-3Al-1Zn[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2008,497(1-2):438. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%