Heterogeneous Nb-Based Nuclei for the Grain Refinement of Al-Si Alloys

Bolzoni, Leandro; Babu, N. Hari

doi:10.1007/s11837-016-1855-8

Cited by 8 publications

(1 citation statement)

References 22 publications

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“…Several studies have been reported on the grain-refining efficiency of AlxNb-yB master alloys on grain refinement of commercial Al-Si alloys. [16][17][18][19][20] Although research studies have been carried out on the grain refinement of AlSi alloys using Al-Nb-B master alloys, very little emphasis has been laid on optimizing the casting process parameters during the synthesis of Al-Nb-B master alloys meant for grain refinement of Al-Si alloys. The aim of this publication is to study the effect of casting process parameters such as sources of Nb, reaction times, effects of stirring on synthesis and microstructures of Al-Nb-B master alloys.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Casting Process Parameters for Synthesis of Al-Nb-B Master Alloy

Jha

Mandal

Srirangam

2018

JOM

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Al-Nb-B master alloys were synthesized using commercial pure aluminum, niobium, and KBF 4 salts. Two different sources of Nb (pure Nb powder and Al60%Nb powder) were used to prepare the master alloy. Casting process parameters such as reaction time and melt stir time interval were varied to enhance the formation of in situ intermetallic particles in the master alloys. The size, shape and distribution of intermetallic particles in these master alloys were studied using microscopy techniques. The results show that the Al-5Nb-1B master alloy prepared with Al-60%Nb powders has a uniform distribution of intermetallic particles as compared to the master alloy prepared with pure Nb powders. Increase in boron content from 1 wt.% to 2 wt.% in the master alloys resulted in a higher fraction of intermetallic particles. Among all the master alloys synthesized, Al-5Nb-2B was observed to have the highest number of well-distributed intermetallic particles which could act as potential grain refiners of aluminum alloys.

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