研究了不同Al Ti C加入量对Al 7Si 1.5Cu Mg合金的晶粒细化效果。试验发现,随着Al Ti C加入量的增加,枝晶αAl晶粒越细小,组织也越均匀,合金的综合力学性能得到提高;当Al Ti C加入量w为2.6%时,枝晶αAl晶粒接近最小,继续提高Al Ti C加...研究了不同Al Ti C加入量对Al 7Si 1.5Cu Mg合金的晶粒细化效果。试验发现,随着Al Ti C加入量的增加,枝晶αAl晶粒越细小,组织也越均匀,合金的综合力学性能得到提高;当Al Ti C加入量w为2.6%时,枝晶αAl晶粒接近最小,继续提高Al Ti C加入量则组织变化不明显。试验表明Al Ti C中间合金是Al Si合金的良好细化剂。展开更多
A novel A1-Ti-C master alloy containing A14C3 and TiC particle clusters, which exhibits great refining potential for Mg, was prepared. With the addition of 2% A1-Ti-C master alloy, the grains transform to equiaxed cry...A novel A1-Ti-C master alloy containing A14C3 and TiC particle clusters, which exhibits great refining potential for Mg, was prepared. With the addition of 2% A1-Ti-C master alloy, the grains transform to equiaxed crystal with a diameter of （110-a：17） ~tm. The results indicate that A14C3 and TiC particle cluster, rather than a single particle, plays an important role in the refining process. Compared with the simplex smooth nucleating substrate, concave regions on the particle cluster provide easier route for the transformation from liquid Mg atoms to stable nucleus. Nucleus with a small size can also reach the critical nucleation radius when they attach on the concave regions of the substrate. A14C3 and TiC particle clusters thus become more favorable nucleating substrate for a-Mg grains.展开更多
文摘研究了不同Al Ti C加入量对Al 7Si 1.5Cu Mg合金的晶粒细化效果。试验发现,随着Al Ti C加入量的增加,枝晶αAl晶粒越细小,组织也越均匀,合金的综合力学性能得到提高;当Al Ti C加入量w为2.6%时,枝晶αAl晶粒接近最小,继续提高Al Ti C加入量则组织变化不明显。试验表明Al Ti C中间合金是Al Si合金的良好细化剂。
基金Project(DUT15JJ(G)01) supported by the Fundamental Research Funds for the Central Universities,ChinaProject(2009AA03Z525) supported by the National High-tech Research and Development Program of China
文摘A novel A1-Ti-C master alloy containing A14C3 and TiC particle clusters, which exhibits great refining potential for Mg, was prepared. With the addition of 2% A1-Ti-C master alloy, the grains transform to equiaxed crystal with a diameter of （110-a：17） ~tm. The results indicate that A14C3 and TiC particle cluster, rather than a single particle, plays an important role in the refining process. Compared with the simplex smooth nucleating substrate, concave regions on the particle cluster provide easier route for the transformation from liquid Mg atoms to stable nucleus. Nucleus with a small size can also reach the critical nucleation radius when they attach on the concave regions of the substrate. A14C3 and TiC particle clusters thus become more favorable nucleating substrate for a-Mg grains.
