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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
 [1];  [2];  [2];  [1];  [3];  [1];  [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
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

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