The Development of Al-4%B-2%Sr Master Alloy for Refining and Eutectic Silicon Modification in Al-Si-Mg Cast Alloys
Keywords:
Master alloys,, Modification,, Grain refinement,, CastingAbstract
The objective of this research is to development of Al-4%B-2%Sr master alloy for refining and modification of eutectic silicon. Efficiency comparison of Al-4%B-2%Sr master alloy in grain refinement and eutectic modification in Al-Si-Mg cast alloy with different additions (1, 2, 3 and 4.0 wt.%) and constant holding time (30 min) were investigated. The XRD studies show AlB2, SrB6 and Al4Sr intermetallic compound in a-Al matrix. The results show that the addition 4 wt.% of Al-4%B-2%Sr master alloy leads to refining efficiency than 1, 2 and 3 wt.% addition, while eutectic silicon was fully modified into globular morphology. The analyze of macrostructure show that the average grain size of alloy decreased with increasing the master alloy content.
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