In situ synchrotron X-ray diffraction investigations of the physical mechanism of ultra-low strain hardening in Ti-30Zr-10Nb alloy
Journal Article
·
· Acta Materialia
- Univ. of Science and Technology Beijing, Beijing (China). State Key Lab. for Advanced Metals and Materials
- Beihang Univ, Beijing (China). School of Materials Science and Engineering
- Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
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.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Key Research and Development Program of China; National Natural Science Foundation of China (NNSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1480849
- Alternate ID(s):
- OSTI ID: 22744684
OSTI ID: 1496406
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 154; ISSN 1359-6454
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Martensitic transformation, shape memory effect and superelasticity of Ti–xZr–(30–x)Nb–4Ta alloys
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journal | September 2019 |
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