ISSN:
1662-100X
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Biology
,
Technology
Notes:
NiTi shape memory alloys are a group of materials which have a lot of applicationsespecially in aerospace industries and medical equipments because of their excellent properties.Shape memory effect (SME), pseudo-elasticity (PE), high corrosion resistance and biocompatibilityis special properties of these alloys which lead to their extensive applications. The superior behaviorof NiTi alloy is due to thermoelastic martensitic phase transformation. In the present paper, two NiTishape memory alloys were prepared by non-consumable vacuum arc melting technique in copperwater cooled crucible. One of them had commercial elements and the other had high purity elements.Metallographic investigation, chemical analysis, XRD and DSC were carried out on two alloys.Metallographic observation and XRD shows that structure at ambient temperature consists ofaustenite phase besides Ti2Ni, Ni3Ti intermetallic compounds and martensite phase. Transformationinvestigation determines that the impurity such as iron in commercial alloy causes two stage phasetransformation B2→R→B19′
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/43/transtech_doi~10.4028%252Fwww.scientific.net%252FJBBTE.1.91.pdf
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