|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Material Design Approaches and Experiences IV
||Multi-scale Simulation towards the Understanding of the Microstructure Evolution and Fracture Behavior in Titanium Alloys
||Dongsheng Xu, Jinhu Zhang, Chunyu Teng, Hao Wang, Jianke Qiu, Jiafeng Lei, Rui Yang
|On-Site Speaker (Planned)
Titanium alloys are widely used in aero-engine, but due to the large scattering of fatigue life, over-sized design have been utilized, which reduces significantly the energy efficiency of engine and performance of planes. Multi-scale simulations were carried out in order to understand the microstructure formation and fatigue behavior under different conditions. The effects of temperature, external stress on structure characteristics were studied via phase field simulation. The fatigue crack nucleation mechanisms were investigated utilizing atomistic calculation. The defect formation upon cyclic deformation simulation shows that point defects and dislocation loops on slip planes lower the strength of the lattice, and may promote fatigue crack nucleation and propagation. The phase field simulations reveal that variant shape, fraction and texture are strongly influenced by the external stress. These understanding gained by simulations have provided important data for the practical design of thermal mechanical procedure of some engineering alloys.
||Planned: TMS Journal: JOM