Study of grain-level deformation and residual stresses in Ti-7Al under combined bending and tension using high energy diffraction microscopy (HEDM)

被引：58
作者：
Chatterjee, K. [1 ]
Venkataraman, A. [2 ]
Garbaciak, T. [1 ]
Rotella, J. [2 ]
Sangid, M. D. [2 ]
Beaudoin, A. J. [1 ]
Kenesei, P. [3 ]
Park, J-S. [3 ]
Pilchak, A. L. [4 ]
机构：
[1] Univ Illinois, Dept Mech Sci & Engn, 1206 W Green St, Urbana, IL 61801 USA
[2] Purdue Univ, Sch Aeronaut & Astronaut Engn, 701 W Stadium Ave, W Lafayette, IN 47907 USA
[3] Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Lemont, IL 60439 USA
[4] US Air Force, Res Lab, Mat & Mfg Directorate AFRL RXCM, Wright Patterson AFB, OH 45433 USA
来源：
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES | 2016年 / 94-95卷
关键词：
High energy diffraction microscopy; Ti-7Al alloy; Stress gradient; Stress triaxiality; Slip tendency; X-RAY-DIFFRACTION; TI-6AL-4V TITANIUM-ALLOY; TI-AL ALLOYS; ELASTIC-CONSTANTS; CRYSTAL PLASTICITY; INDIVIDUAL GRAINS; FRACTURE LOCUS; STRAIN TENSOR; SINGLE-GRAIN; CREEP;
D O I：
10.1016/j.ijsolstr.2016.05.010
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
In-situ high energy diffraction microscopy (HEDM) experiments are carried out to analyze the state of combined bending and tension in a Ti-7Al alloy under room temperature creep. Grain-level elastic strain tensors are evaluated from HEDM data. Atomistic calculations are used to predict elastic constants of Ti-7Al, to be used in determination of stress from strain. The stress gradient and residual stresses are successfully determined, which allows the demarcation between macroqmicro-level residual stresses. A cluster of three neighboring grains are identified that highlight the variation of mean and effective stress between grains. Crystallographic orientations and slip characteristics are analyzed for the selected grains. It is inferred that the interfaces between loaded grains with markedly different stress triaxiality and slip tendency are potential spots for material damage. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：35 / 49
页数：15
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