考虑两种硬化方式的钛合金α相物理本构模型  

Physical constitutive model of titanium alloy α phase considering two hardening modes

作　　者：杨泽昆 吴建军[1] 闫晶 喻忠平 赵彦娇 谢海南 YANG Ze-kun;WU Jian-jun;YAN Jing;YU Zhong-ping;ZHAO Yan-jiao;XIE Hai-nan(School of Mechanical Engineering,Northwestern Polytechnical University,Xi′an 710072,China;AVIC Manufacturing Technology Institute,Beijing 100024,China)

机构地区：[1]西北工业大学机电学院,陕西西安710072 [2]中国航空制造技术研究院,北京100024

出　　处：《塑性工程学报》2023年第8期176-181,共6页Journal of Plasticity Engineering

基　　金：基础加强计划重点基础研究项目(2020-JCJQ-ZD-188-01);陕西省重点研发计划项目(S2020-YF-ZDCXL-ZDLGY-0029)。

摘　　要：针对钛合金中的α相,推导了引起背应力的几何必需位错的演化方程,该方程包含位错的存储项与湮灭项,同时将几何必需位错与背应力联系起来,从物理机制层面解释了背应力的演化。此外,建立了同时考虑由于位错纠缠导致的各向同性硬化和背应力引起的运动硬化的物理本构模型,利用室温下纯钛的相关实验数据对本构模型进行了验证。结果表明,所提出的本构模型能很好地预测纯钛的应力-应变曲线;与几何必需位错相关的背应力具有较高的准确性,统计存储位错的变化符合相应规律,证实了该物理本构模型具有很好的适用性,为今后采用混合规则建立钛合金的多尺度本构模型以及嵌入仿真软件寻求最优的工艺参数提供了参考。For the α phase in titanium alloy,the evolution equation of the geometrically necessary dislocations causing back stress was deduced.The equation includes the storage term and annihilation term of dislocations,and the geometrically necessary dislocations were related to back stress at the same time.The evolution of back stress was explained from the aspect of physical mechanism.In addition,the physical constitutive model considering isotropic hardening caused by dislocation entanglement and kinematic hardening caused by back stress was established,and the constitutive model was verified by the relevant experimental data of pure titanium at room temperature.The results show that the proposed constitutive model can predict the stress-strain curves of pure titanium well,the back stress related to geometrically necessary dislocations has high accuracy,and the changes of statistically stored dislocations conform to corresponding laws,which confirms that the physical constitutive model has good applicability and provides reference for establishing the multi-scale constitutive model of titanium alloy by the mixing rule and embedding the simulation software to find the optimal process parameters in the future.

关 键 词：本构模型 加工硬化 几何必需位错 背应力 

分 类 号：TG146.23[一般工业技术—材料科学与工程]