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材料工程  2010 

Ba对原位自生Mg2Si/Mg-Zn-Si复合材料组织与力学性能的影响

, PP. 63-68

Keywords: Ba,Mg2Si,变质,异质形核

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Abstract:

研究添加0.1%~2.0%Ba(质量分数,下同)对高Si原位自生Mg2Si/Mg-Zn-Si复合材料组织和力学性能的影响.结果表明随着Ba含量的增加,初生Mg2Si由树枝晶转变为多面体颗粒,其尺寸先减小后增大;汉字状共晶Mg2Si也先减少后增加;复合材料的力学性能显著改善.当Ba含量为1.0%时,其细化变质效果最好,合金的综合力学性能最佳,这是由于Ba的加入形成了大量细微的BaMg2Si2粒子可作为初生Mg2Si的异质形核核心,从而细化变质了Mg2Si;当Ba含量过高(>1.0%),BaMg2Si2相聚集长大导致了过变质现象,力学性能下降.变质为细小多边形的Mg2Si颗粒减少了加载时应力集中与裂纹产生、扩展;其弥散分布阻碍了变形时位错运动,因此强化了复合材料.

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