Journal
ACTA MATERIALIA
Volume 154, Issue -, Pages 45-55Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2018.05.034
Keywords
Titanium alloys; Tensile behavior; Martensitic transformation; Strain hardening; High-energy X-ray diffraction
Funding
- National Key Research and Development Program of China [2017YFA0403804]
- National Natural Science Foundation of China [51471032, 51527801]
- Fundamental Research Funds for the Central Universities [06111020]
- Fundamental Research Fund at the State Key Laboratory for Advanced Metals and Materials [2016Z-01, 2016Z-12, 2016Z-19]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Science [DE-AC02-06CH11357]
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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](alpha '') axis toward the tensile direction. Our investigations provide in-depth understanding of the mechanism of the excellent plasticity with ultra-low strain hardening in beta-type titanium alloys. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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