钛合金双态组织高温拉伸行为的晶体塑性有限元研究

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英文篇名：CPFEM Study of High Temperature Tensile Behavior of Duplex Titanium Alloy 作者：李学雄 ; 徐东生 ; 杨锐 英文作者：LI Xuexiong;XU Dongsheng;YANG Rui;Institute of Metal Research, Chinese Academy of Sciences;University of Chinese Academy of Sciences; 关键词：材料科学基础学科 ; 变形协调性 ; 晶体塑性有限元 ; 钛合金 ; 双态组织 ; 应力应变分配 英文关键词：foundational discipline in materials science;;deformation compatibility;;CPFEM;;titanium alloy;;duplex microstructure;;distributions of micro stress and strain 中文刊名：CYJB 英文刊名：Chinese Journal of Materials Research 机构：中国科学院金属研究所;中国科学院大学; 出版日期：2019-04-25 出版单位：材料研究学报 年：2019 期：v.33 基金：国家重点研发计划(2016YFB0701304);; 中国科学院信息化专项课题(XXH13506-304)~~ 语种：中文; 页：CYJB201904001 页数：13 CN：04 ISSN：21-1328/TG 分类号：3-15

摘要

创建一个包含多变体结构特征的双态组织几何模型,提出一种变形协调性的评估方法,采用以率相关滑移为主的晶体塑性有限元本构关系,研究了具有不同组织特征的Ti-6Al-4V合金双态组织的高温拉伸行为。结果表明:在多晶变形过程中,α_p相承载了更多的应变;在变形后的样品中,出现了大致对称分布于拉伸方向两侧的高应变交叉条带;存在于α_p与β_T之间的包围结构特征,可加剧局域应变分配的差异;随着α_p相体积分数的升高应变量降低,整体应变协调性先较快降低而后平稳;随着α_s片层厚度的增加高应变条带特征弱化,整体应变协调系数升高;含双变体α_s片层团簇结构的β_T组织,其应变协调性低于含单变体和三变体的组织。
        Duplex microstructure models containing multi-variants in eachβtransformed(β_T)grains are established,and then,the high temperature tensile deformation of Ti-6Al-4V alloys with different microstructure features was investigated via the rate-dependent crystal plasticity finite element simulation by taking all slip systems in theαandβphases into consideration.The spatial distributions and time evolution of the stress and strain in various grains and phases are analyzed in detail,and a new method is proposed to evaluate quantitatively the deformation consistency.Simulation results showed thatα_punderwent higher strain distribution rather thanβ_T,and inter-crossing high strain bands formed in the duplex microstructure and distributed symmetrically with respect to the tensile direction.The surrounding structure formed betweenα_pandβ_Tgrains can enhance the differences in the local strain distribution.Increasing the volume fraction ofα_pmay reduce the strain allocation inα_p,the consistency coefficient of strain first decrease rapidly and then stabilized.As the thickness ofα_sincrease,the feature of high strain bands weakened and the consistency coefficient of strain increased.The consistency coefficient of strain forβ_(T )containing doubleα_svariants is usually lower than that with single or threeα_svariants.

引文

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