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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Bibliographic Details
Published inScripta materialia Vol. 64; no. 8; pp. 725 - 728
Main Authors Bigelow, G.S., Garg, A., Padula II, S.A., Gaydosh, D.J., Noebe, R.D.
Format Journal Article
LanguageEnglish
Published 01.04.2011
Subjects
Martensitic transformations
Nickel base alloys
Precipitation
Shape memory
Superelasticity
Thermal cycling
Titanium compounds
Transformation temperature
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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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ISSN:1359-6462
DOI:10.1016/j.scriptamat.2010.12.028