Effects of Al-Sr Master Alloys on the As-Cast Microstructure of the AZ31 Magnesium Alloys

Abstract

The influence of Al-10.5%Sr master alloy, which is much cheaper than Mg-Sr master alloys, on the as-cast microstructure of the AZ31 alloy was investigated. The research results revealed that the Al-10.5%Sr master alloy produced obvious modification of the as-cast microstructure of the AZ31 alloy, and the modification efficiency increased with the holding time from 0min to 60min and the amount of Sr from 0.01% to 0.1%. Moreover, the results also showed that the Al-10.5%Sr master alloys of different states had different modification efficiency on the as-cast microstructure of the AZ31 alloy. The Al-10.5%Sr master alloys in extrusion deformation state and rapid solidification state had better modification efficiency than the Al-10.5%Sr master alloys received and in heat treatment state, which could be related to the microstructure of the Al-10.5%Sr master alloys with different states.

Effects of solutionized Al–10Sr master alloys on grain refinement of AZ31 magnesium alloy

“…For example, Srinivasan et al and Nam et al [8,9] reported the addition of Al-10Sr master alloy to a Si-containing AZ91-Mg alloy appeared to refine the microstructure, and similar results were obtained in AM50-Mg alloy and AZ91-Mg alloy by Zhao et al and Hirai et al,respectively [10,11]. In addition, Zeng et al and Chen et al [12,13], respectively, reported that adding pure Sr or Al-10Sr alloy to AZ31-Mg alloy effectively reduced its grain size, and similar results were reported by other researchers [5,6].…”

As cast microstructure and mechanical properties of Mg–6Al–1Zn–0·7Si magnesium alloys modified by Sn and Sr additions

“…Considering that the mechanisms for grain refinement of the Sn or Sr containing Mg-Al based alloys have been described in detail in Refs. [15][16][17][18][19][20][21][22], and that the present work mainly focuses on the modification and refinement of the Mg 2 Si phase, therefore, the effects of Sr and Sn additions on the grain refinement of the Mg-6Al-1Zn-0?7Si alloy need not be discussed in this article.…”

Development of New Types of Magnesium Alloys Containing Sr or RE Elements

“…Chen and co-workers [32] found that the effects of Al-Sr and Mg-Sr master alloys with different states on the refinement to magnesium alloys were very obvious. For example, the refinement efficiency of Mg-10Sr master alloy to AZ31 alloy was higher than that of the Al-10Sr master alloy (Fig.…”