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OALib Journal期刊
ISSN: 2333-9721
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波浪型倾斜板振动过程中合金组织的形成机理
Keywords: 材料合成与加工工艺,波浪型倾斜板,振动
Abstract:
？研究了波浪型倾斜板振动过程中al-6si-2mg合金的组织演化规律和球形晶组织的形成机理.结果表明:al-6si-2mg合金的非枝晶组织形成过程主要受到两种机制的作用.第一种机制是熔体爆发形核和球状长大机制:倾斜板为形核提供了足够大的过冷度和异质形核基础,使熔体爆发形核,熔体均匀的成分场和温度场使部分晶粒球状生长;第二种机制是枝晶臂颈缩断裂和磨圆熟化机制:流动和振动使晶粒低熔点处颈缩断裂,断裂晶粒不断磨圆熟化形成近球形组织.
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