欢迎登录材料期刊网

材料期刊网

高级检索

利用重复冲击变形技术对比研究了a钛合金Ti-2Al-2.5Zr和亚稳β钛合金Ti-10V-2Fe-3Al变形过程中的微观组织演化及纳米晶的形成机制.金相形貌、X射线衍射及透射电镜观察显示,对于Ti-2Al-2.5Zr合金,塑性变形先后经历了形变孪生、位错活动、剪切等3个过程.与之相反,对于Ti-10V-2Fe-3Al合金,马氏体相变主导着合金的变形.相变分割、剪切及逆向马氏体相变持续贡献于合金的晶粒细化.同时发现,尽管变形到应变量1.2时两类合金组织内均出现纳米晶,但是大量的透射形貌观察显示Ti-10V-2Fe-3Al合金中生成的纳米晶晶粒尺寸更小,纳米晶区域更大.这表明,变形过程中激活马氏体相变可加速材料的晶粒细化.

参考文献

[1] Valiev RZ.;Alexandrov IV.;Islamgaliev RK. .Bulk nanostructured materials from severe plastic deformation [Review][J].Progress in materials science,2000(2):103-189.
[2] Bhattacharjee A;Bhargava S;Varma VK;Kamat SV;Gogia AK .Effect of beta grain size on stress induced martensitic transformation in beta solution treated Ti-10V-2Fe-W alloy[J].Scripta materialia,2005(2):195-200.
[3] Chen, W.;Xiao, L.;Sun, Q.;Sun, J..Effect of the initial grain size on grain refinement in Ti-2Al-2.5Zr alloy subjected to multi-impact process[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2012:86-94.
[4] Chen, W.;Sun, Q.;Xiao, L.;Sun, J. .Deformation-induced microstructure refinement in primary α phase-containing Ti-10V-2Fe-3Al alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2010(27/28):7225-7234.
[5] Schoenfeld SE.;Asaro RJ.;Ahzi S. .ELASTIC-PLASTIC CRYSTAL MECHANICS FOR LOW SYMMETRY CRYSTALS[J].Journal of the Mechanics and Physics of Solids,1995(3):415-446.
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:
  • 1
    0%
  • 2
    0%
  • 3
    0%
  • 4
    0%
  • 5
    0%