Load-biased shape-memory and superelastic properties of a precipitation strengthened high-temperature Ni50.3Ti29.7Hf20 alloy
A slightly Ni-rich NiTi-20Hf (at.%) alloy was aged for 3h at 550 not equal to to form a homogeneous distribution of 10-20nm precipitates. To determine the effect of such structures on the martensite-austenite transformation, preliminary load-biased shape-memory and superelastic properties were measu...
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Published in | Scripta materialia Vol. 64; no. 8; pp. 725 - 728 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
01.04.2011
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Subjects | |
Online Access | Get full text |
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Summary: | A slightly Ni-rich NiTi-20Hf (at.%) alloy was aged for 3h at 550 not equal to to form a homogeneous distribution of 10-20nm precipitates. To determine the effect of such structures on the martensite-austenite transformation, preliminary load-biased shape-memory and superelastic properties were measured. The alloy exhibited reasonably high transformation temperatures, near-perfect dimensional stability and a work output as high as 18.7Jcm super(-3) during load-biased thermal cycling. Isothermal stress cycling of the austenite between 180 and 220 degree C resulted in near-perfect superelastic behavior up to 3% applied strain. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1359-6462 |
DOI: | 10.1016/j.scriptamat.2010.12.028 |