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(英文)  

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

作　　者：唐斌[1] 谢韶 刘毅[2] 韩逢博[1] 寇宏超[1] 李金山[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072 [2]昆明贵金属研究所,云南昆明650221

出　　处：《稀有金属材料与工程》2015年第3期532-537,共6页Rare Metal Materials and Engineering

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

摘　　要：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。The incompatibility of plastic deformation in a near β titanium alloy with（α ＋ β） two phases microstructure was analyzed based on the crystal plasticity finite element（CPFE） model. The bicrystal simulation results show that the plastic deformation in the（α ＋ β） two phases microstructure is incompatible, and the deformation behavior of α phase is significantly affected by the crystal orientation and loading direction. In addition, through coupling with three-dimensional（3D） Voronoi tessellation（VT） geometric model, the effect of globular primary α phase in the β matrix on the macroscopic mechanical response was discussed. Based on the CPFE-VT model, it is found that the incompatibility of plastic deformation between the α and β phases can result in a linear reduction of the macroscopic strength with the increase of the volume fraction of α phase. Furthermore, the distribution of primary α phase also plays an important role in the stress-strain response. The proposed model for near β titanium alloy can yield important informations for the microstructure controlling and the performance prediction.

关 键 词：晶体塑性 有限元模拟 变形行为 钛合金 

分 类 号：TG146.23[一般工业技术—材料科学与工程]