INFLUENCE OF TAYLOR FACTOR M ON RECRYSTALLEATION OF THE CUBE AND CUBE-FAMILY GRAINS IN FCC METAL

摘要

It is known that main recrystallization texture of fee metal after cold rolling is {100}<001>(cube) and cube-family of such indiscrete orientation as {100)<013> , (100}<012> and further {015}<100> , (013}<100> , {012(<100> and {034}<100>,etc.. The theory that these existed in hot band and may remain as a nucleus in cold band seems to be supported by many observations with EBSD method. One of the reasons why they recrystallize more easily than other orientation grains was so supposed that subgrains within the cube bands have a size advantage compared with subgrains of other orientations. Why do they recover sooner than other orientations ? The present study calculated Taylor orientation factor M value (dislocation density) in cold rolling and made clear that the distribution of the smallest M value of fee metal under cold rolling is spotted just on the cube {100}<001> orientation in ODF coordinates. The cube(010)[001] (Φ_1=90,Φ=90,Φ_2=0) has the least M value of 1.7 in fee metal under cold rolling and M value indiscretely increases up to 2.2 from the cube, (010)[001]→(010)[106]→(010)[103]→(010)[102]→(010)[203] →(010)[9,0,11] with decrease of Φ_1, and (010)[001]→(160)[001]→(130)[001]→(6,13,0)[001] with increase ofΦ_2. The result that the cube and the cube-family have indiscrete lower M value than other orientation maysupport partly the fact that each of the cube and cube-family recovers sooner than other orientation in annealing. The report also introduces whole map of M value and partly that of bee metal.