Influence of substitution of La by Ce on the glass forming ability and crystallization behavior of Al–Ni–La alloys
Influence of substitution of La by Ce on the glass forming ability and crystallization behavior of Al–Ni–La alloys
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DOI：
10.1016/j.jallcom.2013.04.108
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发表时间：
2013-11
影响因子：
6.2
通讯作者：
Zhongquan Zhang;X. Xiong;Wenzhe Zhou;J. Li
中科院分区：
文献类型：
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作者：
Zhongquan Zhang;X. Xiong;Wenzhe Zhou;J. Li
在相同的制备条件下对Al-Ni-(La-Ce)合金的楔形样品进行了吸铸，比较了它们的非晶形成能力和晶化行为。结果表明，La的部分替代降低了Al85.5Ni9.5La5合金的GFA，而增加了Al87.5Ni7.5La5、Al86.5Ni8.5La5、Al86Ni9La5和Al86Ni9.5La4.5合金的GFA。同时，结晶行为也发生了显着变化。玻璃形成过程中La的最佳替代含量取决于基合金的成分。基合金中Ni含量越低，需要替代的La含量越多。GFA随取代量的变化由La(Ce)中心团簇的原子堆积效率决定。
Wedge-shaped samples of Al–Ni–(La–Ce) alloys were suction cast under an identical preparation condition, and their glass forming abilities (GFAs) and crystallization behaviors were compared. It was revealed that the partial substitution of La by Ce decreases the GFA of Al85.5Ni9.5La5alloy but increases the GFAs of Al87.5Ni7.5La5, Al86.5Ni8.5La5, Al86Ni9La5and Al86Ni9.5La4.5alloys. Meantime the crystallization behavior significantly changes. The optimal substitution content of La for glass formation depends on the composition of the base alloy. The lower the Ni content in the base alloy, the more the La content to be substituted. The GFA change with the substitution content is determined by the atomic packing efficiencies of the La (Ce)-centered clusters.