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Title: Unraveling submicron-scale mechanical heterogeneity by three-dimensional X-ray microdiffraction

Abstract

Shear banding is a ubiquitous phenomenon of severe plastic deformation, and damage accumulation in shear bands often results in the catastrophic failure of a material. Despite extensive studies, the microscopic mechanisms of strain localization and deformation damage in shear bands remain elusive due to their spatial-temporal complexities embedded in bulk materials. Here we conducted synchrotron-based X-ray microdiffraction (μXRD) experiments to map out the 3D lattice strain field with a submicron resolution around fatigue shear bands in a stainless steel. Both in situ and postmortem μXRD results revealed large lattice strain gradients at intersections of the primary and secondary shear bands. Such strain gradients resulted in severe mechanical heterogeneities across the fatigue shear bands, leading to reduced fatigue limits in the high-cycle regime. The ability to spatially quantify the localized strain gradients with submicron resolution through μXRD opens opportunities for understanding the microscopic mechanisms of damage and failure in bulk materials.

Authors:
 [1];  [1];  [1];  [2];  [3];  [4];  [3];  [1];  [1];  [3];  [5]
+ Show Author Affiliations
  1. Univ. of Science and Technology Beijing (China). State Key Lab. for Advanced Metals and Materials
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
  3. Northeastern Univ., Shenyang (China). Key Lab. for Anisotropy and Texture of Materials. School of Materials Science and Engineering
  4. Chongqing Univ. (China). School of Materials Science and Engineering
  5. Georgia Inst. of Technology, Atlanta, GA (United States). Woodruff School of Mechanical Engineering
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Science and Technology Beijing (China); Northeastern Univ., Shenyang (China)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NNSFC); Fundamental Research Funds for the Central Universities (China); State Key Lab. for Advanced Metals and Materials (China); China Postdoctoral Science Foundation
OSTI Identifier:
1439808
Grant/Contract Number:  
AC02-06CH11357; 51231002; 51471032; 51527801; 06111020; FRF-TP-14-047A1; 2014Z-01; 2014M560884
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 115; Journal Issue: 3; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; fatigue; shear band; X-ray microdiffraction; damage mechanism; strain gradient

Citation Formats

Li, Runguang, Xie, Qingge, Wang, Yan-Dong, Liu, Wenjun, Wang, Mingguang, Wu, Guilin, Li, Xiaowu, Zhang, Minghe, Lu, Zhaoping, Geng, Chang, and Zhu, Ting. Unraveling submicron-scale mechanical heterogeneity by three-dimensional X-ray microdiffraction. United States: N. p., 2017. Web. doi:10.1073/pnas.1711994115.
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Li, Runguang, Xie, Qingge, Wang, Yan-Dong, Liu, Wenjun, Wang, Mingguang, Wu, Guilin, Li, Xiaowu, Zhang, Minghe, Lu, Zhaoping, Geng, Chang, & Zhu, Ting. Unraveling submicron-scale mechanical heterogeneity by three-dimensional X-ray microdiffraction. United States. doi:10.1073/pnas.1711994115.
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Li, Runguang, Xie, Qingge, Wang, Yan-Dong, Liu, Wenjun, Wang, Mingguang, Wu, Guilin, Li, Xiaowu, Zhang, Minghe, Lu, Zhaoping, Geng, Chang, and Zhu, Ting. Thu . "Unraveling submicron-scale mechanical heterogeneity by three-dimensional X-ray microdiffraction". United States. doi:10.1073/pnas.1711994115. https://www.osti.gov/servlets/purl/1439808.
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@article{osti_1439808,
title = {Unraveling submicron-scale mechanical heterogeneity by three-dimensional X-ray microdiffraction},
author = {Li, Runguang and Xie, Qingge and Wang, Yan-Dong and Liu, Wenjun and Wang, Mingguang and Wu, Guilin and Li, Xiaowu and Zhang, Minghe and Lu, Zhaoping and Geng, Chang and Zhu, Ting},
abstractNote = {Shear banding is a ubiquitous phenomenon of severe plastic deformation, and damage accumulation in shear bands often results in the catastrophic failure of a material. Despite extensive studies, the microscopic mechanisms of strain localization and deformation damage in shear bands remain elusive due to their spatial-temporal complexities embedded in bulk materials. Here we conducted synchrotron-based X-ray microdiffraction (μXRD) experiments to map out the 3D lattice strain field with a submicron resolution around fatigue shear bands in a stainless steel. Both in situ and postmortem μXRD results revealed large lattice strain gradients at intersections of the primary and secondary shear bands. Such strain gradients resulted in severe mechanical heterogeneities across the fatigue shear bands, leading to reduced fatigue limits in the high-cycle regime. The ability to spatially quantify the localized strain gradients with submicron resolution through μXRD opens opportunities for understanding the microscopic mechanisms of damage and failure in bulk materials.},
doi = {10.1073/pnas.1711994115},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 3,
volume = 115,
place = {United States},
year = {2017},
month = {12}
}
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DOI:  10.1073/pnas.1711994115
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    Development of Intergranular Residual Stress and Its Implication to Mechanical Behaviors at Elevated Temperatures in AL6XN Austenitic Stainless Steel
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