Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 784, Issue -, Pages 111-116Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.01.010
Keywords
Strain reversal; Titanium alloy; Stress-induced martensitic transformation; Gradient martensite; Cyclic forward-reverse torsion
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Funding
- China Scholarship Council, China [201706290055]
- National Natural Science Foundation of China, China [51275414, 51605387]
- Fundamental Research Funds for the Central Universities, China [3102015BJ (II) ZS007]
- Research Fund of the State Key Laboratory of Solidification Processing of NWPU, China [130-QP-2015]
- Seed Foundation of Innovation and Creation for Graduate Students in NWPU, China [Z2018076]
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In this study, the effect of strain reversal on the evolution of microstructure and mechanical properties was investigated. Metastable beta titanium alloy samples with single beta phase were twisted up to 360 degrees with different strain paths: monotonic torsion (MT) and cyclic forward-reverse torsion (CFRT). The results revealed CFRT with strain reversal accumulated lower dislocation density and less martensitic transformation in comparison with MT under the same accumulative strain. The stress-induced martensitic transformation (SIMT) was retarded by strain reversal and this suppression of martensitic transformation is more pronounced with the decreasing amplitude of strain reversal. It was further observed that CFRT samples with a gradient alpha '' martensite have a higher mechanical property both in strength and ductility than MT samples, which are due to interactions between alpha '' martensite and dislocation slip, especially the kinks of alpha '' martensite. (C) 2019 Elsevier B.V. All rights reserved.
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