Deformation mechanisms and mechanical behaviour of titanium beta alloys from Ti20V to Ti20V6Al. Experimental and predicted results

In the present work we have studied alloys of beta-titanium (in all cases t hese were single phase prior to plastic deformation) having compositions Ti 20VXAl where X was Varied in the range 0 to 6%. The alloys containing up to 4% aluminium deform principally by (332) <113> twinning associated with a phase transformation to the phase omega(s). Crystallographic slip intervene s later, preferentially on planes of the type (110). Alloys containing 5 % or more aluminium deform principally by crystallographic slip. The choice o f active deformation modes is confirmed by the good prediction of the cold rolling texture. Correlations between the deformation processes and the mec hanical properties confirm that there is a sound basis for optimizing the m echanical behaviour of these alloys.