Mechanical properties and martensitic transformations in nanocrystalline Ti49.4Ni50.6 alloy produced by high-pressure torsion
Nanocrystalline alloy Ti49.4Ni50.6 (numbers indicate at.%) in the shape of a disc 20 mm in diameter has been successfully produced by high-pressure torsion. High-pressure torsion and annealings at temperatures from 400 to 550 deg C resulted in formation of nanocrystalline structures with the mean gr...
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Published in | Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 503; no. 1-2; pp. 75 - 77 |
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Main Authors | , , , , , |
Format | Conference Proceeding Journal Article |
Language | Russian English |
Published |
Kidlington
Elsevier
15.03.2009
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Online Access | Get full text |
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Summary: | Nanocrystalline alloy Ti49.4Ni50.6 (numbers indicate at.%) in the shape of a disc 20 mm in diameter has been successfully produced by high-pressure torsion. High-pressure torsion and annealings at temperatures from 400 to 550 deg C resulted in formation of nanocrystalline structures with the mean grain size (D) in the range 20-300 nm. The alloys with D = 20 nm possess very high ultimate tensile strength (more than 2000 MPa) but limited ductility. The alloys with D = 300 nm possess high ductility and enhanced ultimate tensile strength. There are areas of strain-induced transformation B2-B19' on the tensile curves, but their extent depends on the grain size. The relationship between mechanical behavior and martensitic transformation in nanocrystalline TiNi alloys is considered and discussed. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0921-5093 1873-4936 |
DOI: | 10.1016/j.msea.2008.08.044 |