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Phase Transformation of Ti-Ni Containing Platinum-Group Metals

Published online by Cambridge University Press:  11 February 2011

Hideki Hosoda ,
Masahiro Tsuji ,
Motoki Mimura ,
Yohei Takahashi ,
Kenji Wakashima  and
Yoko Yamabe-Mitarai
Hideki Hosoda
Affiliation:
Precision and Intelligence Laboratory (P&I Lab), Tokyo Institute of Technology (Tokyo Tech), 4259 Nagatsuta, Midori-ku, Yokohama 226–8503, Japan
Masahiro Tsuji
Affiliation:
Precision and Intelligence Laboratory (P&I Lab), Tokyo Institute of Technology (Tokyo Tech), 4259 Nagatsuta, Midori-ku, Yokohama 226–8503, Japan
Motoki Mimura
Affiliation:
Precision and Intelligence Laboratory (P&I Lab), Tokyo Institute of Technology (Tokyo Tech), 4259 Nagatsuta, Midori-ku, Yokohama 226–8503, Japan
Yohei Takahashi
Affiliation:
Precision and Intelligence Laboratory (P&I Lab), Tokyo Institute of Technology (Tokyo Tech), 4259 Nagatsuta, Midori-ku, Yokohama 226–8503, Japan
Kenji Wakashima
Affiliation:
Precision and Intelligence Laboratory (P&I Lab), Tokyo Institute of Technology (Tokyo Tech), 4259 Nagatsuta, Midori-ku, Yokohama 226–8503, Japan
Yoko Yamabe-Mitarai
Affiliation:
High-Temperature Materials Group, National Institute for Materials Science (NIMS), Sengen 1–2–1, Tsukuba, Ibaraki 305–0047, Japan
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Abstract

Since the maximum shape recovery temperature of the binary Ti-Ni alloys is limited to be around 400K, the increase in martensitic transformation temperature (Ms) of Ti-Ni should be done by alloying for the demand of high temperature applications. Although most of additional elements are known to decrease Ms of Ti-Ni, substitutional elements having large atomic size are expected to increase Ms. In this study, phase constitution, phase transformation temperature, lattice parameter of B2 phase and Vickers hardness were investigated for Ti-Ni alloys containing several platinum-group metals (PGM). The alloy systems investigated were the pseudobinary systems of TiNi-TiRh, TiNi-TiIr and TiNi-TiPt where the PGM atoms substitute for the Ni-sites of TiNi. The phase transformation and phase constitution were assessed by differential scanning calorimetry (DSC), X-ray diffraction analysis (XRD) and transmission electron microscopy (TEM). It was found by XRD that TiNi can contain a large amount of the PGMs as Ti(Ni, Rh), Ti(Ni, Ir) and Ti(Ni, Pt). Lattice parameters monotonously increase with increasing amount of PGMs. With increasing Pt content, Ms slightly decreases when less than 10mol%Pt while continuously increases as the rate of 26K/mol%Pt when more than 10mol%Pt. On the other hand, Ms decreases and then disappears with increasing Rh or Ir content. Hardness ranges from HV180 to HV570 and the maximum values in the pseudobinary systems lie around 20–30mol%PGM, suggesting solid solution hardening caused by the substitution of PGMs.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB5.51
Copyright
Copyright © Materials Research Society 2003

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References

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