MECHANISM OF TEXTURE FORMATION DURING DYNAMIC RECRYSTALLIZATION OF TI-49 MOL-PERCENT-AL

Uniaxial compression tests were conducted in the temperatures ranging from 1223 to 1473 K and strain rates from 2.0 x 10(-5) s(-1) to 1.0 x 10(-3) s(-1). The characteristics of the texture formed during dynamic recrystallization were investigated by calculating an orientation dis tribution function. The formation of a fiber texture with the main com ponent (032) was confirmed. The examination of texture sharpness at th e true strain of about-1.8 showed that the fiber texture became sharpe r with a decrease in peak stress which appeared in true stress-true st rain curves. When the peak stress was relatively low, the texture deve loped monotonously with increasing strain even after dynamically recry stallized grains totally occupied the specimens. It was concluded that strain induced grain boundary migration contributed to the formation of new grains and resulted in the development of the texture.