My research interest is Titanium (Ti) alloys as high temperature materials used in jet engine. Ti alloys is useful to reduce weight of transportation because of their lightweight. In particular, most of my recent works focus on the investigation of high temperature shape-memory Ti-alloy. Ti forms intermetallic compounds with platinum group metals, such as Pt and Pd. The melting temperatures of these intermetallic compounds are very high and their martensitic transformation temperatures related with shape memory effect are also high. We are preparing a lot of compounds and investigating their phase transformation and shape recovery. My first work in NIMS was ultra-high temperature materials using Iridium, one of platinum group metals. I have developed ultra-high temperature materials which can be used around 1800 degree Celsius because the melting temperature of Ir is very high (2,443 degrees Celsius). Ir is used as an engine plug of the cars and crucibles to make single-crystal sapphire for LED. Oxidation resistance is very important to use Ir in such high temperature, then, improvement of oxidation resistance of Ir is also investigated. Platinum group metals are very valuable and limited materials, but they are widely used in industries because of their superior properties. I have developed techniques to use their properties effectively.