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品组织的形成机理.结果表明:Al-6Si-2Mg合金的非枝品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人机制: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,断裂晶粒不断磨圆热化形成近球形组织.
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