Al-0.27Zr-0.064B实验合金的设计、熔炼及其变形特征

The design, casting of an experimental Al-Zr-B alloy and its deformation characteristics

为研究等截面通道角形挤压过程中超细晶粒结构形成的机理及晶界变化过程 ,专门设计并熔铸了含微量Zr和B元素的Al 0 .2 7wt %Zr 0 .0 6 4wt%B合金 ,合金晶界上分布有大量的B2 Zr细小化合物颗粒 ,晶内几乎没有B2 Zr粒子。通过室温轧制、热锻以及随后的退火实验表明 ,B2 Zr具有很高稳定性 ,且再结晶后B2 Zr仍位于原变形后的位置 ,不随退火再结晶时新形成晶界的迁移而迁移 。

To study the formation mechanism of ultra-fine grain microstructure in the process of equal channel angular pressing, we have deigned and cast Al-0.27wt% Zr-0.064wt% B alloy specially. In this alloy, there is a large amount of fine B2Zr compound on its grain boundary, while there is little B2Zr can be seen in its grain. Annealing experiments after room-temperature-rolling and forging respectively show that B2Zr compound is highly stable, 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.