Strengthening the {0001} basal texture of α phases for extruded TNM alloy by high magnetic field heat treatment at 1290 ℃

Abstract

The effect of the magnetic field heat treatment on the high-temperature α phase orientation for extruded TNM alloy was studied. Results show that the strength of {0001} basal texture ({0001} crystal plane is parallel to the extrusion direction) increased after holding for 30 min at 1290 ℃ under the 10T magnetic field. The main reason is due to the preferred growth of α phases with <11-20> orientation (<11-20> crystal orientation is normal to the extrusion direction) during the holding time and the growth behavior of α phases with <11-20> orientation is related to the magnetic field direction. Preferred growth of α phases with <11-20> orientation is mainly by consuming adjacent α phases with <10-10> orientation during holding time at 1290 ℃ under the 10T magnetic field. If the magnetic field direction is parallel to the extrusion direction, the preferred growth of α phases with <11-20> orientation is attributed to the magnetic field inducing the increasing of grain boundary mobility. If the magnetic field direction is normal to the extrusion direction, the preferred growth of α phases with <11-20> orientation is caused by the magnetic driving force generated in grain boundaries under the 10T magnetic field.