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Title: In situ synchrotron X-ray diffraction investigations of the physical mechanism of ultra-low strain hardening in Ti-30Zr-10Nb alloy

Abstract

A warm-rolled, metastable beta-type Ti-30Zr-10Nb alloy exhibited a peculiar two-stage yielding behavior under uniaxial tensile loading, showing a first plastic stage with obvious strain hardening at 0.4%-10.4% strain and a second plastic stage with ultra-low strain hardening at 10.4%-23.5% strain. In situ high-energy X-ray diffraction (HE-XRD) was used to reveal the stress-induced martensitic transformation scenarios and physical mechanism of the different strain hardening rates. It was found that the deformation-induced phase transformation dominated the onset of the first plastic stage corresponding to the selection of favorable martensitic variants, and their elastic interaction contributed to the obvious strain hardening. HE-XRD experiments further verified that the ultra-low strain hardening rate in the second plastic stage was related to an interesting superelasticity of the martensite, which was characterized by the reversible, stress-induced reorientation of the martensite variants. This reorientation of the martensite variants was primarily due to the rigid lattice rotation of similar to 23 degrees about the [110](α '') axis toward the tensile direction. Here, our investigations provide in-depth understanding of the mechanism of the excellent plasticity with ultra-low strain hardening in beta-type titanium alloys.

Authors:
 [1];  [2];  [2];  [1];  [3];  [1]; ORCiD logo [2]
  1. Univ. of Science and Technology Beijing, Beijing (China). State Key Lab. for Advanced Metals and Materials
  2. Beihang Univ, Beijing (China). School of Materials Science and Engineering
  3. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Natural Science Foundation of China (NNSFC); National Key Research and Development Program of China
OSTI Identifier:
1480849
Alternate Identifier(s):
OSTI ID: 1496406
Grant/Contract Number:  
[AC02-06CH11357; 51471032; 51527801; 06111020]
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
[ Journal Volume: 154; Journal Issue: C]; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; high-energy X-ray diffraction; martensitic transformation; strain hardening; tensile behavior; titanium alloys

Citation Formats

Zhu, Z. W., Xiong, C. Y., Wang, J., Li, R. G., Ren, Y., Wang, Y. D., and Li, Y. In situ synchrotron X-ray diffraction investigations of the physical mechanism of ultra-low strain hardening in Ti-30Zr-10Nb alloy. United States: N. p., 2018. Web. doi:10.1016/j.actamat.2018.05.034.
Zhu, Z. W., Xiong, C. Y., Wang, J., Li, R. G., Ren, Y., Wang, Y. D., & Li, Y. In situ synchrotron X-ray diffraction investigations of the physical mechanism of ultra-low strain hardening in Ti-30Zr-10Nb alloy. United States. doi:10.1016/j.actamat.2018.05.034.
Zhu, Z. W., Xiong, C. Y., Wang, J., Li, R. G., Ren, Y., Wang, Y. D., and Li, Y. Tue . "In situ synchrotron X-ray diffraction investigations of the physical mechanism of ultra-low strain hardening in Ti-30Zr-10Nb alloy". United States. doi:10.1016/j.actamat.2018.05.034. https://www.osti.gov/servlets/purl/1480849.
@article{osti_1480849,
title = {In situ synchrotron X-ray diffraction investigations of the physical mechanism of ultra-low strain hardening in Ti-30Zr-10Nb alloy},
author = {Zhu, Z. W. and Xiong, C. Y. and Wang, J. and Li, R. G. and Ren, Y. and Wang, Y. D. and Li, Y.},
abstractNote = {A warm-rolled, metastable beta-type Ti-30Zr-10Nb alloy exhibited a peculiar two-stage yielding behavior under uniaxial tensile loading, showing a first plastic stage with obvious strain hardening at 0.4%-10.4% strain and a second plastic stage with ultra-low strain hardening at 10.4%-23.5% strain. In situ high-energy X-ray diffraction (HE-XRD) was used to reveal the stress-induced martensitic transformation scenarios and physical mechanism of the different strain hardening rates. It was found that the deformation-induced phase transformation dominated the onset of the first plastic stage corresponding to the selection of favorable martensitic variants, and their elastic interaction contributed to the obvious strain hardening. HE-XRD experiments further verified that the ultra-low strain hardening rate in the second plastic stage was related to an interesting superelasticity of the martensite, which was characterized by the reversible, stress-induced reorientation of the martensite variants. This reorientation of the martensite variants was primarily due to the rigid lattice rotation of similar to 23 degrees about the [110](α '') axis toward the tensile direction. Here, our investigations provide in-depth understanding of the mechanism of the excellent plasticity with ultra-low strain hardening in beta-type titanium alloys.},
doi = {10.1016/j.actamat.2018.05.034},
journal = {Acta Materialia},
number = [C],
volume = [154],
place = {United States},
year = {2018},
month = {5}
}

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