大塑性变形材料晶界研究方法的新探索

A new method of researching the grain boundary of intensely deformed materials

为研究在大塑性变形过程中超细晶粒结构形成的机理 ,设计并熔铸了含微量Zr、B的Al合金Al 0 2 7wt%Zr 0 0 6 4wt%B合金 ,该合金中晶界上分布有大量的B2 Zr细小化合物颗粒 ,晶内则几乎没有B2 Zr分布。通过室温轧制及热锻后退火实验表明B2 Zr具有很高稳定性 ,而且再结晶后B2 Zr仍位于原变形后的位置 ,不随再结晶晶界的迁移而迁移 。

It is well known that intense plastic deformations can result in significant microstructure refinement.There are several methods for intense plastic deformations,traditional technology such as cold rolling or drawing,new special deformation techniques such as high\|pressure torsion or equal channel angular pressing.There are many contradiction results about the microstructure refinement mechanism.We have designed and cast Al\|0 27wt.%Zr\|0 064wt.% B alloy for researching the formation mechanism of ultra\|fine grain microstructure in the process of intense plastic deformation.In this alloy,there is a large amount of fine B 2Zr compound on its grain boundary,while there is little B 2Zr can be seen in its grain.Annealing experiments after room\|temperature\|rolling and forging respectively show that B 2Zr compound is highly stable in this alloy,and doesn't move together with the re\|crystallized grain boundary.Conclusions can be drawn that Al\|0 27wt.%Zr\|0 064wt.% B alloy can be used for researching the grain deforming process and fining mechanism in the intense plastic deformation processing. It can be used for researching the recrystallization and the grain growth process as well.