Phase transformation mechanism of Ti-6Al-4V titanium alloy induced by tensile deformation
Phase transition behavior plays a crucial role on the plastic deformation and mechanical prop-erties of titanium alloy.Therefore,it is very necessary to study the phase transition behavior and further reveal the corresponding mechanism of titanium alloy.In this paper,a novel heat treatment process was successfully used to introduce a fine β grain martensite structure into Ti-6Al-4V titanium alloy.Deform-ation-induced HCP phase to FCC phase transition behavior under tensile loading conditions was dis-covered,and the corresponding phase transition mechanism was revealed.The crystallographic orienta-tion relationship between the HCP phase and the newly formed FCC phase is:(0002)HCP‖(11(1))FCC and<2(1)(1)0>HCP ‖<011>FCC.The phase transition mechanism is proposed based on the crystallo-graphic orientation relationship between the two phases:1/3<10(1)0>type Shockley partial dislocations slip on every two(0001)atomic basal planes.This phase transition mechanism was further verified by first principles that calculated the change of(0001)<10(1)0>stacking fault energy during HCP to FCC phase transition.
NETL
NSTL
万方数据
