冷轧铜板再结晶織构的形成

电解纯铜经88.7％冷轧后,所形成的轧制织构除稳定的(110)112]舆(112)111]外,还存在着一种(3,6,11)533]织构。在较低温度下退火时,再结晶织构主要为(100)001]、(358)352]和舆(100)001]成孪生取向的(122)212]织构。随着退火温度的增加,(358)352]织构逐渐减弱,立方织构(100)001]则逐渐加强;当退火温度达到900℃时,开成了集中的(100)001]织构。冷轧铜板在退火的过程中,具有(100)001]再结晶晶粒首先形成,然后普遍地发生同位再结晶。其中具有(100)001]取向的晶粒,继续发生选择性的生长,最后形成了集中的立方织构。本支中对轧制织构舆其再结晶织构取向间的关系也进行了分析,再结晶织构一般可认为是原有织构沿某一个111]轴旋转45°,22°或38°的结果。同时,根据上述几何关系所绘出的理想极图舆实际测定的结果也是符合的。试验结果指出,不同加热速度和不同加热程序对形成最终的再结晶织构,不发生显著的影响,而退火温度对再结晶织构的形成起着主要的作用。

THE DEVELOPMENT OF RECRYSTALLIZATION TEXTURE OF COLD-ROLLED COPPER STRIPS

The rolling texture of electrolytic copper after a reduction of thickness 88.7% can be described as (110) 112], (112) 111] and a texture (3,6,11) 533]. During annealing at lower temperature, the recrystallization texture was found to be (100) 001] + (358) 352] plus a (122) 212] texture which is a twin position with respect to (100) 001] texture. Together with the raising of the annealing temperature, a decrease of (358) 352] texture and on increase of (100) 001] texture was observed. When annealing temperature reached to 900℃, a nearly perfect cubic texture was developed.During annealing at higher temperature (900℃), grains having (100) 001] oriention appeared first. Then, an overall "recrystallization in situ" took place and the (100) 001] grains tended to grow selectively at the expense of the others. Finally, a concentrated (100) 001] texture was produced.The geometric relationship between the rolling texture and the recrystallization texture was investigated. In general, the change from the rolling texture to the recrystallization texture may be suggested as a rotation of 45°, 22°, 38° about a common 111] axis. The ideal pole-figures, constructed according to the above relationship were found to be in good agreement with the experimental results.It was found that the different rate of heating and the different annealing procedures produced no signeficant effect on the final recrystallization texture. The temperature of annealing, however, was the main factor contributing to the development of the recrystallization texture.