近β钛合金中两相组织不协调变形行为的晶体塑性有限元研究

稀有金属, 2015, 44(3): 532-537.

近β钛合金中两相组织不协调变形行为的晶体塑性有限元研究

唐斌 ^1, , 谢韶 ^2, , 刘毅 ^3, , 韩逢博 ^4, , 寇宏超 ^5, , 李金山 ^6,

1.西北工业大学凝固技术国家重点实验室,陕西西安,710072

2.西北工业大学凝固技术国家重点实验室,陕西西安,710072

3.昆明贵金属研究所,云南昆明,650221

4.西北工业大学凝固技术国家重点实验室,陕西西安,710072

5.西北工业大学凝固技术国家重点实验室,陕西西安,710072

6.西北工业大学凝固技术国家重点实验室,陕西西安,710072

基金项目: the "111" Project of China (B08040) National Fund of the State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals (SKL-SPM-201212)

关键词：晶体塑性 , 有限元模拟 , 变形行为 , 钛合金

Crystal Plasticity Finite Element Study of Incompatible Deformation Behavior in Two Phase Microstructure in Near β Titanium Alloy

Keywords： crystal plasticity , finite element simulation , deformation behavior , titanium alloy

基于晶体塑性模型,研究了近β钛合金中(α+β)两相组织的不协调变形行为.首先,双晶体模型的计算结果表明(α+β)两相组织中的塑性变形是不协调的,而且α相的变形行为与晶体取向和加载方向密切相关.另外,通过耦合三维Voronoi几何模型,探讨了近β钛合金中球状初生α相对宏观力学响应的影响.利用该CPFE-VT数值模型,研究发现α相与β相的不协调变形导致了合金强度随α相体积分数的增加而成线性降低.此外,β基体中α相的分布对合金应力-应变响应也有较大的影响.针对具有两相组织的近β钛合金建立的晶体塑性有限元模型为钛合金组织控制技术的发展以及性能预测提供了重要的途径.

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