Deformation behavior of CP-titanium: Experiment and crystal plasticity modeling

作者：Wronski M; Kumar M Arul^*; Capolungo L; McCabe R J; Wierzbanowski K; Tome C N

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2018, 724: 289-297.

DOI：10.1016/j.msea.2018.03.017

• Crystal plasticity
• Twin variant selection
• Titanium
• Dislocation density

The deformation behavior of commercially pure titanium is studied using experiments and a crystal plasticity model. Compression tests along the rolling, transverse, and normal-directions, and tensile tests along the rolling and transverse directions are performed at room temperature to study the activation of slip and twinning in the hexagonal closed packed titanium. A detailed EBSD based statistical analysis of the microstructure is performed to develop statistics of both {10-12} tensile and {11-22} compression twins. A simple Monte Carlo (MC) twin variant selection criterion is proposed within the framework of the visco-plastic self-consistent (VPSC) model with a dislocation density (DD) based law used to describe dislocation hardening. In the model, plasticity is accommodated by prismatic, basal and pyramidal slip modes, and {10-12} tensile and {11-22} compression twinning modes. The VPSC-MC model successfully captures the experimentally observed activation of low Schmid factor twin variants for both tensile and compression twins modes. The model also predicts macroscopic stress-strain response, texture evolution and twin volume fraction that are in agreement with experimental observations.

• 出版日期2018-5-2
• 单位Los Alamos