个人信息Personal Information
学历：博士研究生毕业
学位：工学博士学位
性别：男
学科：力学. 航空宇航科学与技术. 材料科学与工程. 机械工程. 冶金工程. 先进制造. 航空工程. 材料工程. 冶金工程. 机械工程. 固体力学
多尺度与微纳米力学，梯度结构材料，界面力学，固体本构关系，应变梯度理论，晶体塑性有限元，离散位错动力学，分子动力学，高熵合金，大数据与机器学习，材料基因，极端力学，高性能材料
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2021-10-16 博士毕业生赵建锋论文“Laser shock peened Ti-6Al-4V alloy: experiments and modeling ”被International Journal of Mechanical Sciences 期刊接受发表
Highlights
•LSP induces more prolonged elastic-plastic transition in tensile deformation of Ti-6Al-4 V alloy.
•Accurate modeling is obtained using a deformation-mechanism-based constitutive model.
•Residual stress distinctly weakens the initial yielding due to the premature yielding of substrate.
•Grain refinement enhances both the yielding and strain hardening.
Abstract
Systematical microstructure characterization, mechanical testing and constitutive modeling were carried out to quantify the effects of residual stress and grain refinement on tensile properties of Ti-6Al-4 V alloy treated by laser shock peening (LSP). Microstructure characterization showed that grain size is refined to nanoscale in the outmost surface. Meanwhile, LSP treatment introduced a maximum compressive residual stress of 600 MPa in the surface region. The macroscopic tensile test indicated a more prolonged elastic-plastic transition in the LSP-treated Ti-6Al-4 V alloy than the as-received one. As a result, the 0.2% offset yield strength of the LSP-treated Ti-6Al-4 V alloy was reduced by about 52 MPa, while the flow strength at the subsequent strain hardening stage was enhanced. To quantitatively evaluate the individual influence of gradient microstructure and residual stress on the tensile response, we established a deformation-mechanism-based and size-dependent constitutive model. Implementation of the constitutive model demonstrated that the surface grain refinement enhances both the initial yielding and strain hardening of LSP-treated Ti-6Al-4 V alloy. In contrast, the residual stress has a significant weakening effect on the initial yielding but has little influence on its strain hardening behavior. The established microstructure and deformation mechanism-based model can help guide the LSP processing to further improve the mechanical performance of Ti-6Al-4 V alloy.