Study on the Crystal Structure of α' Martensite in a Ti-4Al-4.5Mo Titanium Alloy

摘要

An investigation has been made on the crystal structure of a" attained in a Ti-4Al-4. 5Mo titanium alloy quenched from the α+β field. The disordered a" martensite was observed in the alloy quenched from 910°C, while the ordered a" martensite was found in the alloy quenched from 8701 and 840°C. The ordering in the crystal structure of α" marensite may be related to CSRO in the high temperature β phase. For a better fit of Mo content than the structures reported in literature,a new ordered C-centered orthorhombic crystal structure with Cmcm space group was proposed for the α"martensite.