Martensite-type transformations in platinum alloys

Depending on the martensitic transformation temperatures and mechanical pro perties, alloys exhibiting this phenomenon can have a wide range of applica tions. Such transformations are known to exist in the platinum system. Plat inum-iron is reported to exhibit a martensitic transformation, for example, from a disordered fee (face-centred cubic) to a bcc (body-centred cubic), or from an ordered fee to a bet (body-centred tetragonal) structure. The tr ansformation temperature is usually in the range 30 to 300 degrees C. A mar tensite-type transformation has also been observed in platinum-titanium, wh ere a B2 (ordered bcc) to B19 (orthorhombic) transformation occurs, with th e transformation temperature in the region of 1000-1070 degrees C. Martensi te transformations have been observed in other platinum systems, such as pl atinum-gallium and platinum-aluminium. This paper describes martensitic-typ e transformations in the platinum-titanium system. (C) 1999 Elsevier Scienc e S.A. All rights reserved.