Dispersed-phase martensitic transformation controlled deformation behavior of two-phase metallic materials

被引:14
|
作者
Grujicic, M
Sankaran, N
机构
[1] Department of Mechanical Engineering, Clemson University, Clemson
基金
美国国家科学基金会;
关键词
D O I
10.1016/S0020-7683(97)00012-7
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
A constitutive model which describes transformation plasticity accompanying stress-assisted martensitic transformation in two-phase material systems consisting of a stable matrix and a transforming dispersed phase is developed. The model consists of two parts: (a) a transformation thermodynamics/kinetics law describing the evolution of the transformed fraction of dispersed particles and (b) a constitutive law describing plastic flow resistance of the evolving three-phase (matrix phase, dispersed parent phase, dispersed product phase) composite material. The model is constructed in such a way that it can be readily implemented in a finite element program suitable for the analysis of boundary value problems. The model is used to analyze the uniaxial tensile behavior of the two-phase gamma Ti-Al matrix/beta (Ti-Al-V-Fe) phase system in order to rationalize an experimentally observed nearly 100% increase in tensile ductility of the material due to the martensitic transformation in the beta phase. The model is also used to study the uniaxial tensile behavior of beta/alpha two phase Ti-10V-2Fe-3Al (wt.%) alloy characterized by a sigmoidal stress-strain curve. A reasonably good agreement is obtained between the model predictions and the experimental data. (C) 1997 Elsevier Science Ltd.
引用
收藏
页码:4421 / 4446
页数:26
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