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作 者:王飞[1] 李克[1] 余啸[1] 詹美清[1] 吴尚敏[1] 周耐根[1]
机构地区:[1]南昌大学机电工程学院
出 处:《特种铸造及有色合金》2013年第4期370-373,共4页Special Casting & Nonferrous Alloys
基 金:国家自然科学基金资助项目(51264032);江西省自然科学基金资助项目(20114BAB206037);教育部留学回国人员科研启动基金资助项目(第44批)
摘 要:利用ICP、SEM、EDS等分析手段,研究了Mn元素对碳质细化Mg-3Al合金剂效果的影响。通过对细化处理前后的镁合金铸态组织的显微分析发现,Mn元素对Mg-3Al合金凝固组织有良好的晶粒细化效果。添加0.32%的Mn可使Mn-3Al平均晶粒尺寸减小到66μm,但进一步增加Mn含量,细化效果不再明显。分析认为,当Mn含量较小时,细小的球状和杆状AlMn相可与Al4C3一起作为α-Mg的有效形核核心。随着Mn含量增大,过饱和的溶质Mn、Al与Al4C3、Al-C-O等碳化物相互作用,形成更多粗大的十字花瓣状Al-Mn-C-O相,减少了有效形核核心数目,导致晶粒粗化。Effects of manganese on heterogeneous nucleation and grain refinement of Mg-3Al alloys with carbon inoculation were investigated by using ICP, SEM and EDS, and so on. As-cast microstructure of the Mg-Al alloy after and before Mn addition was observed. The results show that the addition of Mn element can refine effectively the grain size in Mg-3Al alloys. The average grain size of primary Mg in the Mg-Al alloy can be refined to about 66 μm with 0.32% Mn addition. However, the grain size is coarsened with further increasing in manganese content. It is found that small rod-like or particle AlMn phases, which can act as possible nucleating substrate of primary Mg grain, is formed with the Mn content lower than 0.32%. With increasing in Mn content, supersaturated Mn and Al elements can react with Al4C3 and Al-C-O particles in the melt and subsequently large cross petal-like Al-Mn-C-O phases are formed, leading to the coarseness of primary Mg grain as a result of the decrease of effective heterogeneous nuclei.
分 类 号:TG146.22[一般工业技术—材料科学与工程]
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