Abstract The mechanical behaviors of commercially pure titanium (CP-Ti) sheets under uniaxial and reverse loadings along various in-plane directions are investigated by crystal plasticity modeling together with experiments. The elastic viscoplastic self-consistent (EVPSC) crystal plasticity model, that incorporates an enhanced twinning and detwinning (TDT) scheme to consider multiple twinning modes, is employed for the crystal plasticity modeling. The in-plane anisotropic, the tension-compression asymmetric, and the unique work hardening behaviors of the CP-Ti sheets are ascribed to available deformation mechanisms. In addition to various deformation slips (e.g., prismatic, basal and pyramidal c + a slips), deformation twinning and detwinning of extension ( { 10 1 ¯ 2 } ) and contraction ( { 11 2 ¯ 2 } ) twinning modes are deliberated in particular. The effect of the mechanisms on the evolution of the stress strain relation, hardening rate, texture, relativity activities, and twin volume fractions, etc. is explored. It is found that twinning and detwinning of both extension and contraction twins, as well as deformation slips, affect significantly the behaviors of the CP-Ti sheets. The modeling results agree well with the corresponding experiments. The difference of the mechanical behaviors between the two sheets and the difference among various loading conditions are ascribed to the different combination of the operative deformation mechanisms, especially the contribution from twinning and detwinning of extension and contraction twins.

中文翻译：

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商业纯钛板的孪生和解孪行为

摘要 通过晶体塑性建模和实验研究了商业纯钛（CP-Ti）板在沿不同面内方向的单轴和反向载荷下的力学行为。弹性粘塑性自洽 (EVPSC) 晶体塑性模型用于晶体塑性建模，该模型结合了增强孪生和解孪 (TDT) 方案以考虑多种孪晶模式。CP-Ti 板的面内各向异性、拉压不对称和独特的加工硬化行为归因于可用的变形机制。除了各种变形滑移（例如，棱柱形、基底和金字塔形 c + a 滑移），特别考虑了拉伸（{10 1¯ 2 } ）和收缩（ { 11 2¯ 2 } ）孪生模式的变形孪生和解孪生。探讨了这些机制对应力应变关系、硬化速率、织构、相对性活动和孪晶体积分数等演化的影响。结果表明，拉伸和收缩孪晶的孪晶和解孪晶以及变形滑移对 CP-Ti 片材的行为有显着影响。建模结果与相应的实验吻合良好。两种板材力学行为的差异以及不同加载条件下的差异归因于变形操作机制的不同组合，特别是拉伸和收缩孪晶的孪生和解孪作用。探讨了这些机制对应力应变关系、硬化速率、织构、相对性活动和孪晶体积分数等演化的影响。发现拉伸和收缩孪晶的孪晶和解孪晶以及变形滑移对 CP-Ti 片材的行为有显着影响。建模结果与相应的实验吻合良好。两种板材力学行为的差异以及不同加载条件下的差异归因于变形操作机制的不同组合，特别是拉伸和收缩孪晶的孪生和解孪作用。探讨了这些机制对应力应变关系、硬化速率、织构、相对性活动和孪晶体积分数等演化的影响。结果表明，拉伸和收缩孪晶的孪晶和解孪晶以及变形滑移对 CP-Ti 片材的行为有显着影响。建模结果与相应的实验吻合良好。两种板材力学行为的差异以及不同加载条件下的差异归因于变形操作机制的不同组合，特别是拉伸和收缩孪晶的孪生和解孪作用。结果表明，拉伸和收缩孪晶的孪晶和解孪晶以及变形滑移对 CP-Ti 片材的行为有显着影响。建模结果与相应的实验吻合良好。两种板材力学行为的差异以及不同载荷条件下的差异归因于变形作用机制的不同组合，特别是拉伸和收缩孪晶的孪生和解孪的贡献。结果表明，拉伸和收缩孪晶的孪晶和解孪晶以及变形滑移对 CP-Ti 片材的行为有显着影响。建模结果与相应的实验吻合良好。两种板材力学行为的差异以及不同加载条件下的差异归因于变形作用机制的不同组合，特别是拉伸和收缩孪晶的孪生和解孪作用。 2。 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?