ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
To develop new shape memory and super-elastic alloys for medical applications, titaniumalloys using non-toxic metallic elements, such as Ta and Nb, are being actively investigated.In this study, aimed at developing new shape memory Ti alloys, we investigate the effect ofoxygen, a powerful alpha stabilizing interstitial element, on the heat treatment behavior ofTi-50mass%Ta-5mass%Zr through electrical resistivity and Vickers hardness measurementsand shape-recovery tests. Ti-50Ta-5Zr-0.14Ox and 0.33Ox alloys, and the β and α” bi-phasewas confirmed by XRD. Only the β phase was identified in the Ti-50Ta-5Zr-0.62Ox alloy.Upon isochronal heat treatment, the resistivity at LN and resistivity ratio of Zr-0.33 and0.62Ox alloys decreased up to around 523 K. In the 5Zr-0.62Ox alloy, orthorhombicmartensite and the α” and β phases were identified in the specimens heat-treated at 473 and523 K. The decreases in resistivity at liquid nitrogen temperature and resistivity ratio aredue to the formation of α” during isochronal heat treatment. The formation of α” wasconfirmed by X-ray diffraction in the 5Zr-0.62Ox alloy. The shape memory effect wasobserved in 5Zr-0.14 and 0.33Ox alloys and the shape recovery ratio of both alloys was about40% at 673 K
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.3613.pdf
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