Refinement effect of two rare earth borides in an Al-7Si-4Cu alloy: A comparative study
作者： Lijun Jing , Ye Pan , Tao Lu , Wenke Chai
DOI: 10.1016/J.MATCHAR.2018.09.031
关键词:
摘要: Abstract In this paper, refinement performance of Al-La-B and Al-Ce-B refiners in Al-7Si-4Cu alloy their effects on defects tensile properties were investigated. Due to the orientation relationships between rare earth borides Al, CeB6 LaB6 can act as nucleation substrate α-Al refine Al-Si-Cu casting effectively. refiner showed better refining efficacy than because lower lattice mismatch less angel difference certain relationship demonstrated by TEM analysis. Tensile prominently improved from 204.4 ± 5.9 MPa 250.6 ± 6.7 MPa as-cast state 335.7 ± 6.5 MPa 386.0 ± 7.0 MPa heat treatment owing refined microstructures much fewer shrinkage defects. However, when addition level was higher 1.0 wt%, amount gas pores significantly increased. Hence, best is considered be 1.0 wt%.
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