Influence of chromium and impurities on the grain- refining behavior of aluminum |
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Authors: | A Arjuna Rao B S Murty M Chakraborty |
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Affiliation: | (1) Department of Metallurgical and Materials Engineering, 721 302 Kharagpur, India;(2) Indian Institute of Technology, 721 302 Kharagpur, India |
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Abstract: | The grain-refining behavior of high purity aluminum (HPA1) and commercial purity aluminum (CPA1) containing Fe and Si as impurities
(<0.2 wt pct each) has been studied with and without the presence of Cr in small and large quantities (0.2 and 2 wt pct).
The Al-5Ti-lB master alloy ingot (0.2 wt pct) was used as a grain refiner. The emphasis was on the influence of individual
elements and their interactions with the other elements on the grain-refining behavior of Al. Good grain refinement with insignificant
fading in CPA1 was observed in comparison to HPA1. Similar results were obtained with a small concentration of Cr in HPA1
in HPA1-0.2 wt pct Cr alloy. The CPA1 and HPA1-0.2 wt pct Cr alloy have given the best grain-refining results among all the
cases studied. A combination of small quantities of Fe, Si, and Cr (CPA1-0.2 wt pct Cr) has shown early and significant fading.
A large concentration of Cr (2 wt pct) has shown a poisoning effect irrespective of the presence or absence of impurities
such as Fe and Si in Al. Thus, Cr was found to be beneficial for grain refinement at smaller concentrations in the absence
of impurities. But at higher concentrations of Cr, it had an adverse effect,i.e., led to coarser grain sizes both in the presence and absence of impurities. |
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