摘要
在对等通道角挤压中模具通道夹角、挤压路线和挤压温度研究的基础上,确定了实验中的理想工艺。研究发现,AZ91镁合金经过一个道次的等通道角挤压后,材料中就有大量的超细晶粒出现。随着道次数增加,超细晶粒比例逐渐增多。AZ91镁合金经过225℃四道次+180℃二道次的挤压后,屈服强度和抗拉强度分别达到290MPa和417MPa,伸长率达到8.45%。
Based on the investigation of die angle, pressing route and pressing temperature, the optimum parameters were chosen in the experiments of equal channel angular pressing (ECAP). It was found that a great deal of ultra-fine grains appear in AZ91 just after one pass of ECAP. With the increase of pass number, the proportion of ultra-fine grain increases. After ECAP with 4 passes at 225℃and 2 passes at 180℃, the yield strength and ultimate tensile strength of AZ91 increases to 290MPa and 417MPa respectively, and elongation increases to 8.45%.
出处
《热加工工艺》
CSCD
北大核心
2006年第13期13-16,共4页
Hot Working Technology