铈对AZ31镁合金铸态组织的影响

The effect of Ce addition on As-cast microstructures of AZ31 magnesium alloy

研究了Ce对AZ31镁合金铸态组织的影响。研究结果表明:添加0.5～1.5wt%Ce到AZ31镁合金中不但不能细化合金的晶粒,反而使合金的晶粒变得粗大,并且粗化趋势受Ce加入量的影响较大。当添加0.5wt%Ce到AZ31镁合金中后,合金的平均晶粒尺寸从最初的60μm增大到164μm。此后,随着Ce加入量从0.5wt%增加到1.5wt%,合金的平均晶粒尺寸又开始逐渐减小,但仍大于未添加Ce合金的平均晶粒尺寸。

Various opinions still exist regarding the grain refinement of magnesium alloys resulting from Ce addition. We investigate effect of Ce addition on the as-cast microstructures of AZ31 magnesium alloy. The research results indicate that adding from 0. 5 wt% to 1. 5 wt% Ce to AZ31 magnesium alloy does not effectively refine the alloy grains; instead, the opposite effect results, causing obvious grain coarsening. The coarsening trend is related to the amount of Ce. After adding 0.5 wt%/60 Ce to AZ31 magnesium alloy, the average alloy grain size increases from 60 μm to 164 μm. Furthermore, increasing the amount of Ce added from 0.5 wt% to 1.5 wt% causes the average grain size to decrease gradually. The average grain size of AZ31 magnesium alloy with and additional 1.5 wt% Ce still exceeds that of the AZ31 magnesium alloy without additional Ce, however.