TiAu and TiPt high temperature shape memory alloys

Author

Wadood, Abdul ; Yamabe-Mitarai, Yoko

Author_Institution

High Temp. Mater. Unit, Nat. Inst. for Mater. Sci. (NIMS), Tsukuba, Japan

fYear

2014

fDate

14-18 Jan. 2014

Firstpage

1

Lastpage

4

Abstract

Equiatomic TiAu and TiPt exhibit thermo-elastic martensitic phase transformation at high temperature. Phase transformation temperatures of TiPt (A_f=1057°C) are about 400°C higher than TiAu (A_f=624°C). However TiAu and TiPt exhibit partial shape memory effect and very low strength (e.g. ~120MPa for TiAu and ~20MPa for TiPt) in B2 phase region. So these alloys cannot be used for high temperature applications without improving their shape memory properties and strength in B2 phase region. Zirconium (Zr) belongs to same group IV as titanium (Ti). However atomic radius of Zr (1.58Å) is larger than Ti (1.47Å). So it was expected that partial substitution of Ti with Zr will improve the high temperature strength and shape memory properties of TiAu and TiPt alloys. Then in this study, we shall compare the effect of partial substitution of Ti with Zr on high temperature strength and shape memory properties of TiAu and TiPt high temperature shape memory alloys.

Keywords

gold alloys; high-temperature effects; martensitic transformations; platinum alloys; shape memory effects; thermoelasticity; titanium alloys; B2 phase region; TiAu; TiPt; atomic radius; high temperature strength; high-temperature shape memory alloys; partial shape memory effect; partial substitution effect; phase transformation temperature; thermoelastic martensitic phase transformation; Shape; Shape memory alloys; Solids; Temperature; Temperature measurement; Zirconium;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Sciences and Technology (IBCAST), 2014 11th International Bhurban Conference on

Conference_Location

Islamabad

Type

conf

DOI

10.1109/IBCAST.2014.6778107

Filename

6778107