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Si与Mg含量对离心铸造原位颗粒增强Al-xSi-yMg复合材料组织与耐磨性能的影响

, PP. 155-164

Keywords: 初晶Si,初晶Mg2Si,体积分数,耐磨性能,离心铸造

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Abstract:

采用离心铸造方法制备了不同Si、Mg含量的Al-xSi-yMg复合材料筒状铸件,考察了不同成分铸件的宏观组织和微观组织,并测试了不同成分铸件的耐磨性能,分析并计算了Al-xSi-yMg合金中形成初晶颗粒的条件。结果表明:除Al-15Si-5Mg外,其他各成分铸件内侧均形成了含有初晶Si或Mg2Si颗粒的增强层,外侧为不含颗粒的非增强层。不同成分Al-xSi-yMg铸件中形成的初晶颗粒、颗粒增强层的相对厚度值(k)以及颗粒的体积分数各不相同。随着铸件内层初晶颗粒体积分数的逐渐增加,材料的耐磨性能显著提高。计算结果表明,当x≥12.8+0.49y且y≥5时(15≤x≤30,y≤8),合金中形成初晶Si、Mg2Si两种颗粒;当x<12.8+0.49y且y≥5时,合金中只形成初晶Mg2Si颗粒;当x≥12.8+0.49y且y<5时,合金中只形成初晶Si颗粒;当x<12.8+0.49y且y<5时,合金中不形成初晶颗粒。

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