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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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不同制备条件下原位Mg2Si/Al复合材料的组织演变和耐磨性*
DOI: 10.3724/SP.J.1037.2013.00726, PP. 753-761
Keywords: 原位Mg2Si/Al复合材料,等温热处理,组织演变,球化,耐磨性
Abstract:
采用普通重力铸造、挤压铸造和等温热处理半固态挤压的方法制备了原位Mg2Si/Al复合材料,研究了其组织演变和耐磨性.结果表明,P孕育变质后,铸态组织中Mg2Si增强相由粗大的枝晶转变为细小的块状,经过等温热处理后的半固态组织,Mg2Si增强相分布均匀、尺寸细小,表现为规则的球形,a-Al的形貌也变得较为圆整,表现为规则的球状或椭球状.此外,等温热处理的半固态组织中的Mg2Si和a-Al尺寸还有较为明显的改变.与普通重力铸造Mg2Si/Al复合材料相比,挤压铸造复合材料的HB硬度提高了23.5%,半固态挤压复合材料的HB硬度提高了39%.在相同磨粒尺寸和载荷条件下,普通重力铸造复合材料的磨损率最大,挤压铸造复合材料的磨损率次之,半固态挤压复合材料的磨损率最小.
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