Influence of Microtexture on Early Plastic Slip Activity in Ti-6Al-4V Polycrystals

被引：46

作者：

Hemery, Samuel ^{[1
]}

Van Truong Dang ^{[1
]}

Signor, Loic ^{[1
]}

Villechaise, Patrick ^{[1
]}

机构：

[1] CNRS ENSMA Univ, UPR CNRS 3346, Inst Pprime, ENSMA Teleport 2,Dept Phys & Mech Mat, 1 Ave Clement Ader,BP 40109, F-86961 Futuroscope, France

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2018年 / 49A卷 / 06期

关键词：

FATIGUE-CRACK-INITIATION; HIGH-CYCLE FATIGUE; ALPHA/BETA-TITANIUM-ALLOY; DWELL-FATIGUE; CRYSTAL PLASTICITY; CELLULAR-AUTOMATON; TI-ALLOYS; CRYSTALLOGRAPHIC ORIENTATION; DEFORMATION MECHANISMS; FINITE-ELEMENT;

D O I：

10.1007/s11661-018-4569-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Microtextured regions are known to influence the fatigue performance of titanium alloys. Previous studies revealed that crack initiation, accounting for most of the fatigue life, is triggered by slip activity. The influence of microtextured regions on the early plastic slip activity was presently investigated by means of an in situ tensile test performed inside a scanning electron microscope on a bimodal Ti-6Al-4V polycrystalline specimen. A slip trace analysis was carried out in several regions with different crystallographic textures to highlight potentially different deformation behaviors. Significant stress heterogeneities were revealed through an early slip activation in microtextured regions with a predominant [0001] orientation. This point was shown to be related to a locally increased resolved shear stress. Consequences on behavior under cyclic loadings are finally discussed.

引用

页码：2048 / 2056

页数：9

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