中文摘要：

通过脉冲激光重熔Zr55All 0Ni5Cu30非晶合金和Zr65Al7.5Ni10Cu17.5非晶合金,分析了具有不同玻璃形成能力的非晶合金热影响区晶化行为的差异。结果表明,玻璃形成能力稍差的Zr65Al7.5Ni10Cu17.5非晶合金比玻璃形成能力强的Zr55All 0Ni5Cu30非晶合金热影响区晶化严重。激光重熔Zr55Al10Ni5Cu30非晶合金4次后,热影响区仅有稀疏的球状晶粒析出;而激光重熔Zr65Al7.5Ni10Cu17.5非晶合金1次时,热影响区布满球状晶粒,激光重熔4次后,晶化晶粒长大明显,且在球状晶粒的内部呈现树枝状放射生长形态。激光重熔热影响区非晶合金的晶化行为与该合金的玻璃形成能力密切相关。玻璃形成能力越高,越有利于保持热影响区的非晶状态。

英文摘要：

Crystallization in the heat-affected zone with nominal composition of Zr55All 0Ni5Cu30 and Zr65Al7.5Ni10Cu17.5,which has different glass forming abilities,is investigated during pulsed Nd∶YAG laser remelting processing.It is found that the crystallization in the heat-affected zone for Zr65Al7.5Ni10Cu17.5 alloy with low glass forming ability is more severe than that for Zr55All 0Ni5Cu30 alloy.There are only small number of micron-scale spherical grains sparsely formed in heat-affected zone,even Zr55All0Ni5Cu30 alloy is laser remelted repeatedly by four times.However,the heat-affected zone is almost fully covered with the spherical grains when Zr65Al7.5Ni10Cu17.5 alloy is laser remelted once.When Zr65Al7.5Ni10Cu17.5 alloy is laser remelted by four times,the size of spherical grains increase obviously,and there exhibits a radial dendritic growth in the spherical grain.Crystallization in the heat-affected zone for bulk metallic glasses during pulsed Nd∶YAG laser remelting mainly depends on the glass forming ability of the alloy,and the high glass-forming ability is in favor of keeping the heat-affected zone under amorphous state.