Influence of chromium and impurities on the grain-refining behavior of aluminum

摘要: The grain-refining behavior of high purity aluminum (HPA1) and commercial (CPA1) containing Fe Si as impurities (<0.2 wt pct each) has been studied with without the presence Cr in small large quantities (0.2 2 pct). Al-5Ti-lB master alloy ingot pct) was used a grain refiner. emphasis on influence individual elements their interactions other Al. Good refinement insignificant fading CPA1 observed comparison to HPA1. Similar results were obtained concentration HPA1 HPA1-0.2 alloy. have given best among all cases studied. A combination Fe, Si, (CPA1-0.2 Cr) shown early significant fading. (2 poisoning effect irrespective or absence such Thus, found be beneficial for at smaller concentrations impurities. But higher Cr, it had an adverse effect,i.e., led coarser sizes both