The potential of near-equiatomic titanium-platinum (NiTi) alloys for high-temperature applications were studied. Alloys were created by arc melting, homogenized at 1250°C for 3 h, and then quenched with ice water. The phase transformation temperatures were investigated using differential thermal analysis (DTA) between 600°C to 1100°C at a heating and cooling rate of 10°C min-1 using a Shimadzu DTA-50 device. X-ray diffraction analysis was conducted at room temperature to high temperature from 20°-90° in 2θ using a Rigaku TTR-III X-ray diffractometer with CuKα radiation. The higher strength and shape memory properties for were related to the combined effects of solid solution strengthening and (Ti,Zr)Pt3 precipitation. It was also reported that the crystal structure of orthorhombic martensite (B19) changed to tetragonal structure with increasing Ir content in Ti50(Pt,Ir)50 alloys.
ASJC Scopus subject areas
- Metals and Alloys