STUDY OF THE ALPHA'' PHASE TEXTURE OBTAINED BY MARTENSITIC BETA-ALPHA'' PHASE-TRANSFORMATION INDUCED BY TENSILE TEST IN A SHEET OF TI5AL2SN4ZR4MO2CR1FE

The purpose was to investigate the texture development of the alpha '' orthorhombic martensite phase induced by stress within a commercial s heet of Ti5Al2Sn4Zr4Mo2Cr1Fe. First, the experimental textures of the initial b.c.c. phase, then of the b.c.c. phase and the alpha '' marten site phase after a uniaxial deformation were determined from pole figu res. Comparison of the alpha '' experimental texture with a alpha '' t exture, simulated with no variant selection from the b.c.c. texture of the initial beta matrix clearly shows that a strong variant selection was induced by stress. In order to better understand the formation of this alpha '' orthorhombic texture, texture transformations were simu lated according to different variant selection assumptions. As a resul t, it was shown that the alpha '' orthorhombic texture is formed by th e variants favourably oriented with respect to stresses induced during tensile test. (C) 1998 Acta Metallurgica Inc. Published by Elsevier S cience Ltd. Ali rights reserved.