A MICROMECHANICAL MODEL FOR γ-TiAl BASE PST CRYSTALS
来源期刊：Acta Metallurgica Sinica2005年第6期
论文作者：G.K. Hu J.L. Su
Key words：TiAl alloy; crystal plasticity; micromechanical model; yield surface;
Abstract: An analytical micromechanical method is proposed to examine the dependence of plastic deformation on the microstructure for a PST crystal. The sub-domain rnicrostructure of the γ phase and the effect of the α2 phase are taken into account by a proper micromechanical formulation,the dislocation slip and twinning deformation mechanisms are considered in the context of crystal plasticity. The model can well predict the dependence of stress-strain relations on loading angle with respect to the microstructure. The influence of the twinning and lamellar spacing on the deformation behavior and biaxial yield surfaces for PST crystals are also examined.
G.K. Hu1，J.L. Su2
(1.Department of Applied Mechanics, Beijing Institute of Technology, Beijing 100081, China;
2.School of Mechanics-Electrics Engineering, Fujian Agriculture and Forestry University,Fuzhou 350002, China)
Abstract:An analytical micromechanical method is proposed to examine the dependence of plastic deformation on the microstructure for a PST crystal. The sub-domain rnicrostructure of the γ phase and the effect of the α2 phase are taken into account by a proper micromechanical formulation,the dislocation slip and twinning deformation mechanisms are considered in the context of crystal plasticity. The model can well predict the dependence of stress-strain relations on loading angle with respect to the microstructure. The influence of the twinning and lamellar spacing on the deformation behavior and biaxial yield surfaces for PST crystals are also examined.
Key words:TiAl alloy; crystal plasticity; micromechanical model; yield surface;
【全文内容正在添加中】
