Effect of ageing the R-phase in Ti-Ni based alloys

M. Kozuma, Y. Murakami, K. Otsuka

Research output: Contribution to conferencePaper

5 Citations (Scopus)

Abstract

The R-phase in a Ti-47.75at%Ni-1.5at%Fe alloy was investigated to find whether or not it shows the martensite ageing effect as is the case in other thermoelastic alloys. The effect of ageing the R-phase was examined on the reverse transformation temperature to the B2 parent phase, the critical stress for the rearrangement of R-phase variants and the Young's modulus, which are the typical parameters to exhibit a remarkable change with the martensite ageing. All the parameters were confirmed to remain unchanged even by the low temperature (around room temperature) ageing for more than 72 hr., which is quite in contrast to the case for the ζ2′ martensite in a Au-49.5at%Cd alloy, despite the close crystal structures to each other. The electric resistance measurements suggested that the lower vacancy concentration in a Ti-47.75at%Ni-1.5at%Fe alloy, compared with that for the ζ2′ martensite in a Au-49.5at%Cd alloy, is responsible for the absence of the martensite ageing effect in the R-phase.

Original languageEnglish
Pages233-238
Number of pages6
Publication statusPublished - 1998 Jan 1
EventProceedings of the 1996 International Conference on Displacive Phase Transformations and their Applications in Materials Engineering - Urban, IL, USA
Duration: 1996 May 81996 May 9

Other

OtherProceedings of the 1996 International Conference on Displacive Phase Transformations and their Applications in Materials Engineering
CityUrban, IL, USA
Period96/5/896/5/9

ASJC Scopus subject areas

  • Engineering(all)

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    Kozuma, M., Murakami, Y., & Otsuka, K. (1998). Effect of ageing the R-phase in Ti-Ni based alloys. 233-238. Paper presented at Proceedings of the 1996 International Conference on Displacive Phase Transformations and their Applications in Materials Engineering, Urban, IL, USA, .