论文部分内容阅读
本文研究了气体保护条件下,常规熔铸的Mg-Gd-Y-Zr合金中夹杂物的形貌、分布及形成原因,并通过计算分析了夹杂物的沉降行为.结果表明,Mg-Gd-Y-Zr合金中有MgO或Y的氧化物为主的球状、簇状、不规则状、线状的复合夹杂物和含熔剂夹杂物,夹杂物的平均尺寸为12.7μm,平均体积分数为0.26%.夹杂物出现的频率随其尺寸增大而急剧减小,尺寸在20μm以下的夹杂物占夹杂物总体积接近85%,尺寸在45μm以下的夹杂物占96%.计算结果表明,夹杂物沉降速率与其尺寸和密度相关;夹杂物密度增大,可使镁合金中夹杂物的最大尺寸减小,计算得到的合金中最大夹杂物的尺寸与实验结果基本一致.
In this paper, the morphology, distribution and causes of inclusions in conventional cast Mg-Gd-Y-Zr alloys under gas protection conditions were studied, and the settlement behavior of inclusions was analyzed.The results show that Mg-Gd-Y - Zr alloy MgO or Y oxide-based spherical, tufted, irregular, linear composite inclusion and flux inclusion, the average size of inclusions was 12.7μm, the average volume fraction of 0.26% The frequency of inclusions decreases sharply with the increase of their size.The inclusions below 20μm account for 85% of the total volume of inclusions and 96% of the inclusions below 45μm.The calculation results show that the inclusions settle The rate is related to its size and density. When the inclusion density is increased, the maximum size of inclusions in the magnesium alloy can be reduced. The size of the largest inclusions in the alloy is basically consistent with the experimental results.