Crystal plasticity analysis of change in incompatibility and activities of slip systems in α-phase of Ti alloy under cyclic loading

被引:18
作者
Kawano, Yoshiki [1 ]
Ohashi, Tetsuya [1 ]
Mayama, Tsuyoshi [2 ]
Kondou, Ryoji [3 ]
机构
[1] Kitami Inst Technol, Dept Mech Engn, Kitami, Hokkaido 0908507, Japan
[2] Kumamoto Univ, Dept Mat Sci & Engn, Kumamoto 8608555, Japan
[3] Univ Ryukyus, Dept Mech Syst Engn, Fac Engn, Nishihara, Okinawa 9030213, Japan
关键词
Crystal plasticity analysis; Activities of slip systems; alpha-phase; Cyclic loading; Incompatibility; TITANIUM-ALLOY; DEFORMATION-BEHAVIOR; ISOAXIAL BICRYSTALS; METAL CRYSTALS; FATIGUE; TI-6AL-4V; ORIENTATION; TEXTURE; MORPHOLOGY; INITIATION;
D O I
10.1016/j.ijmecsci.2017.09.023
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
With respect to Ti-6A1-4V alloy (Ti-64) with duplex phases constructed by alpha-phase with an hcp structure and beta-phase with a bcc structure, basal slips in alpha-phase can potentially lead to crack initiation under fatigue loading. Hence, it is necessary to quantitatively evaluate the activity of basal slip systems. However, the critical resolved shear stress (CRSS) for the basal slips in alpha-phase is equal to or slightly exceeds that for the prismatic slips, and mechanisms for the activation of slip systems are not completely understood. The present study involved conducting crystal plasticity analysis of alpha-phase subjected to cyclic loading and uniaxial tensile loading employing bicrystal models and uniaxial tensile analysis of tricrystal models. The results indicated that a trade-off relationship exists between the activities of slip systems. Specifically, the inactivation of prismatic <a> slip system in a crystal grain activates the basal slip system in the neighboring crystal grains due to the changes of incompatibility by work hardening around the grain boundary triple junction line. The changes in incompatibility can be explained by wedge disclination type deformation field. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:475 / 485
页数:11
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