Optimal Selection and Control for Precipitation of alpha_2 Phase in Near a High Temperature Ti Alloys during Aging Treatment

摘要

The characteristic of the precipitation and growth of alpha_2 percent ordered phase during aging treatment in near a Ti alloys have been investigated in terms of the influences of aging temperature, aging time and aging manner. The results exhibit that aging temperatures influence the distribution of alpha_2 phase precipitated and cause the changes in growth speed of alpha_2 phase. For various aging temperatures, the time to finish precipitation of alpha_2 phase is different. The facts that various distribution characteristics and growth speed of alpha_2 ordered phase are caused by changed aging condition imply optimal selection and control for precipitation of alpha_2 ordered phase reachable. Some discussions on adoptable aging steps are presented.