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Title: Direct measurement of critical resolved shear stress of prismatic and basal slip in polycrystalline Ti using high energy X-ray diffraction microscopy

Abstract

Knowledge of the critical resolved shear stress (CRSS) values of different slip modes is important for accurately modeling plastic deformation of hexagonal materials. Here, we demonstrate that CRSS can be directly measured with an in-situ high energy X-ray diffraction microscopy (HEDM) experiment. A commercially pure Ti tensile specimen was deformed up to 2.6% strain. In-situ far-field HEDM experiments were carried out to track the evolution of crystallographic orientations, centers of masses, and stress states of 1153 grains in a material volume of 1.1mm×1mm×1mm. Predominant prismatic slip was identified in 18 grains, where the orientation change occurred primarily by rotation around the c-axis during specimen deformation. By analyzing the resolved shear stress on individual slip systems, the estimated CRSS for prismatic slip is 96±18 MPa. Predominant basal slip was identified in 22 other grains, where the 2 orientation change occurred primarily by tilting the c-axis about an axis in the basal plane. The estimated CRSS for basal slip is 127±33 MPa. The ratio of CRSSbasal/CRSSprismatic is in the range of 1.7-2.1. From indirect assessment, the CRSS for pyramidal < c+a > slip is likely greater than 240MPa. Lastly, grain size and free surface effects on the CRSS value in different grainsmore » are also examined.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1373591
Alternate Identifier(s):
OSTI ID: 1397863
Grant/Contract Number:  
AC02-06CH11357; DESC0002001; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 132; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Critical resolved shear stress; Crystal plasticity; High-energy X-ray diffraction; In situ tension test; Titanium

Citation Formats

Wang, L., Zheng, Z., Phukan, H., Kenesei, P., Park, J. -S., Lind, J P, Suter, Robert, and Bieler, Thomas R. Direct measurement of critical resolved shear stress of prismatic and basal slip in polycrystalline Ti using high energy X-ray diffraction microscopy. United States: N. p., 2017. Web. doi:10.1016/j.actamat.2017.05.015.
Wang, L., Zheng, Z., Phukan, H., Kenesei, P., Park, J. -S., Lind, J P, Suter, Robert, & Bieler, Thomas R. Direct measurement of critical resolved shear stress of prismatic and basal slip in polycrystalline Ti using high energy X-ray diffraction microscopy. United States. doi:https://doi.org/10.1016/j.actamat.2017.05.015
Wang, L., Zheng, Z., Phukan, H., Kenesei, P., Park, J. -S., Lind, J P, Suter, Robert, and Bieler, Thomas R. Sun . "Direct measurement of critical resolved shear stress of prismatic and basal slip in polycrystalline Ti using high energy X-ray diffraction microscopy". United States. doi:https://doi.org/10.1016/j.actamat.2017.05.015. https://www.osti.gov/servlets/purl/1373591.
@article{osti_1373591,
title = {Direct measurement of critical resolved shear stress of prismatic and basal slip in polycrystalline Ti using high energy X-ray diffraction microscopy},
author = {Wang, L. and Zheng, Z. and Phukan, H. and Kenesei, P. and Park, J. -S. and Lind, J P and Suter, Robert and Bieler, Thomas R.},
abstractNote = {Knowledge of the critical resolved shear stress (CRSS) values of different slip modes is important for accurately modeling plastic deformation of hexagonal materials. Here, we demonstrate that CRSS can be directly measured with an in-situ high energy X-ray diffraction microscopy (HEDM) experiment. A commercially pure Ti tensile specimen was deformed up to 2.6% strain. In-situ far-field HEDM experiments were carried out to track the evolution of crystallographic orientations, centers of masses, and stress states of 1153 grains in a material volume of 1.1mm×1mm×1mm. Predominant prismatic slip was identified in 18 grains, where the orientation change occurred primarily by rotation around the c-axis during specimen deformation. By analyzing the resolved shear stress on individual slip systems, the estimated CRSS for prismatic slip is 96±18 MPa. Predominant basal slip was identified in 22 other grains, where the 2 orientation change occurred primarily by tilting the c-axis about an axis in the basal plane. The estimated CRSS for basal slip is 127±33 MPa. The ratio of CRSSbasal/CRSSprismatic is in the range of 1.7-2.1. From indirect assessment, the CRSS for pyramidal < c+a > slip is likely greater than 240MPa. Lastly, grain size and free surface effects on the CRSS value in different grains are also examined.},
doi = {10.1016/j.actamat.2017.05.015},
journal = {Acta Materialia},
number = C,
volume = 132,
place = {United States},
year = {2017},
month = {5}
}

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