Intermittent plasticity in individual grains: A study using high energy x-ray diffraction

被引:22
作者
Chatterjee, K. [1 ]
Beaudoin, A. J. [1 ,2 ]
Pagan, D. C. [2 ]
Shade, P. A. [3 ]
Philipp, H. T. [4 ]
Tate, M. W. [4 ]
Gruner, S. M. [2 ,4 ,5 ]
Kenesei, P. [6 ]
Park, J. -S. [6 ]
机构
[1] Univ Illinois, Mech Sci & Engn, Urbana, IL 61801 USA
[2] Cornell Univ, CHESS, Ithaca, NY 14853 USA
[3] US Air Force, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA
[4] Cornell Univ, Lab Atom & Solid State Phys, Ithaca, NY 14853 USA
[5] Cornell Univ, Kavli Inst Nanoscale Sci, Ithaca, NY 14853 USA
[6] Argonne Natl Lab, Adv Photon Source, Lemont, IL 60439 USA
来源
STRUCTURAL DYNAMICS-US | 2019年 / 6卷 / 01期
基金
美国国家科学基金会;
关键词
DEFORMATION; SLIP; EVOLUTION; STRENGTH; FLOW;
D O I
10.1063/1.5068756
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Long-standing evidence suggests that plasticity in metals may proceed in an intermittent fashion. While the documentation of intermittency in plastically deforming materials has been achieved in several experimental settings, efforts to draw connections from dislocation motion and structure development to stress relaxation have been limited, especially in the bulk of deforming polycrystals. This work uses high energy x-ray diffraction measurements to build these links by characterizing plastic deformation events inside individual deforming grains in both the titanium alloy, Ti-7Al, and the magnesium alloy, AZ31. This analysis is performed by combining macroscopic stress relaxation data, complete grain stress states found using far-field high energy diffraction microscopy, and rapid x-ray diffraction spot measurements made using a Mixed-Mode Pixel Array Detector. Changes in the dislocation content within the deforming grains are monitored using the evolution of the full 3-D shapes of the diffraction spot intensity distributions in reciprocal space. The results for the Ti-7Al alloy show the presence of large stress fluctuations in contrast to AZ31, which shows a lesser degree of intermittent plastic flow. (C) 2019 Author(s).
引用
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页数:13
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