Experimental study of the ternary magnesium–aluminium–strontium system

Mechanical Properties and Microstructure of Magnesium-Aluminum Based Alloys Containing Strontium

“…When the Sr/Al ratio was very low, there was an insufficient amount of Sr to bind all the Al atoms and the excess Al would form the Mg 17 Al 12 phase. These results were confirmed by Parvez et al 7) who investigated 22 alloys in the Mg-Al-Sr system. They found that Al 4 Sr and -Mg were the dominating phases.…”

“…In the past decade, new types of Mg-Al-Sr-based alloys like AJ50X, AJ52X and AJ62X have been successfully developed by adding various amount of Sr to the AM50 commercial magnesium alloy by Noranda Inc. (Table 1). [5][6][7][8][9] The Mg-AlSr-based alloys (AJ alloys) are found to have superior creep performance and tensile strength at temperatures as high as 175 C. Among these alloys, Mg-6Al-2.4Sr (AJ62X) exhibits an optimum combination of creep resistance and excellent castability, and AJ62LX has better ductility than other AJ alloys. Yusuke et al found that Ca addition of more than 1 mass% to AM50 alloy not only significantly improved creep resistance but also enhanced casting crack tendency.…”

“…The microstructure of AJ alloys was found to be characterized by a lamellar Al 4 Sr-(Mg) phase that formed at the interdendritic/grain boundary region of the primary magnesium matrix. [5][6][7][8][9] Mg-5Al-2Sr (AJ52X) had a ternary phase that was tentatively named as Al 3 Mg 13 Sr. When the strontium level was low in AJ62X, the volume fraction of Al 4 Sr was reduced.…”

“…The effect of strontium on the microstructure of AZ31 magnesium alloy was investigated by Zeng et al 19) The phase diagrams of Sr-containing magnesium alloys are important base for investigation on the compounds of Mg-Sr based alloys. However, only limited work has been done on the phase diagrams of magnesium alloys containing Sr. 7,20,21) In 2003, Koray et al 20) calculated the liquidus projection of the ternary Mg-Al-Sr system, and the calculated phase diagram exhibited substantial disagreement with the experimental data. The extended solubility between the solid phases was not considered in the thermodynamic assessment.…”

“…[1][2][3][4] Therefore, a lot of ways are being investigated in the world in order to further improve the mechanical properties and processing performances of the magnesium alloys. [5][6][7][8][9][10][11][12][13][14][15][16] Alloying is an important method used by many researchers. In recent years, Mg-Al-Sr alloy system has emerged as potential heat-resistant Mg-alloys.…”