Effects of modifying the hypoeutectic AlMg5Si2Mn alloy via addition of Al10Sr and/or Al5TiB

P Snopiński,M Król,T Wróbel,K Matus,A Woźniak,T Tański,P Palček

doi:10.1007/s43452-020-00147-6

P Snopiński, M Król + Show 5 more

Open Access

https://doi.org/10.1007/s43452-020-00147-6

Copy DOI

Abstract

This work demonstrates that the combined addition of Al10Sr and Al5TiB master alloys to the AlMg5Si2Mn effectively refines the grain microstructure and partially modifies the eutectic Mg2Si phase. Thorough spectroscopic characterization reveals that the grain refinement effect is due to Al3Ti particles acting as nucleation sites for α-Al grains, and the increased nucleation temperature of α-Al is due to Al10Sr addition. It is also determined that TiB2 particles can act as nucleation substrates for the primary Mg2Si phase. The prepared alloy sample with the finest microstructure (treated with both Al10Sr and Al5TiB) exhibits the greatest corrosion resistance among all tested samples.

Highlights

AlMg5Si2Mn is a non-heat-treatable 5xxx series aluminum foundry alloy that contains Mg and Si as major alloying elements
Our results clearly indicate that even minimal amounts of Al10Sr and/or Al5TiB master alloys added to the base AlMg5Si2Mn alloy decrease the grain size and alter the size and morphology of the eutectic M g2Si phase
We investigated the influence of the combined addition of Al10Sr and Al5TiB on the microstructure of AlMg5Si2Mn alloy

Summary

Introduction

AlMg5Si2Mn is a non-heat-treatable 5xxx series aluminum foundry alloy that contains Mg and Si as major alloying elements. An important approach to enhancing the functionality of these alloys involves controlling the Recently, many investigations have been conducted to refine the microstructure and improve the mechanical properties of Al–Mg–Si alloys or Al–Mg2Si composites by applying methods such as rapid cooling [6], melt superheating [7], hot extrusion [8], pre-homogenization deformation treatment [9], or chemical modification [10]. Among these strategies, chemical modification is a simple and cost-effective approach to microstructure enhancement and Mg2Si particle refinement.

Methods

Results

Discussion

Conclusion