Journal
ACTA METALLURGICA SINICA-ENGLISH LETTERS
Volume 35, Issue 2, Pages 317-325Publisher
CHINESE ACAD SCIENCES, INST METAL RESEARCH
DOI: 10.1007/s40195-021-01253-x
Keywords
NiTi alloy; Phase transformation; Strength and ductility; Wear resistance; Cryogenic rolling
Categories
Funding
- National Natural Science Foundation of China [51931003]
- China Postdoctoral Science Foundation [2020M680223]
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The nanostructured NiTi alloy produced through cryo-rolling and post-annealing treatments shows significantly improved mechanical performance and wear resistance, attributed to the refined microstructure and high work hardening capability achieved during the preparation process.
By combining cryo-rolling and post-annealing treatments, the nanostructured NiTi alloy is produced. A differential scanning calorimetry measurement was used to test the effect of the preparation process on phase transformation. The cryo-rolling changes the tensile fracture of NiTi alloy to a ductile manner. Interestingly, the recovered structure exhibits significant strength improvement, while the tensile plasticity is still comparable to that of the coarse-grained structure. This optimized mechanical performance is due to the strengthening effect of refined microstructure and the high work hardening capability rendered by moderate dislocation density. Ball-on-plate reciprocating dry-sliding wear test reveals that the nanostructured NiTi alloy also has enhanced wear resistance, which is primarily ascribed to the high content of residue martensite formed during cryo-rolling. These results provide an effective route to optimize the mechanical and wear properties of NiTi alloys.
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