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Effects of Sr additions on the microstructural stability and mechanical properties of a cast Mg–4Zn alloy
, Article Materials Science and Engineering A ; Volume 843 , 2022 ; 09215093 (ISSN) ; Asadollahi, M ; Alizadeh, R ; Mahmudi, R ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
The effects of Sr additions (0.3, 0.6 and 0.9 wt%) on the microstructural evolution, thermal stability, and mechanical properties of a cast Mg–4Zn alloy were investigated. The extent of grain growth and stability of the intermetallic compounds were studied by optical and scanning electron microscopy (SEM), respectively. Mechanical properties of the studied alloys were evaluated by shear punch testing (SPT) method and also the hardness test. Hardness and shear strength of the base alloy were increased by Sr additions in the as-cast condition, due to the grain refinement effect of Sr and also presence of the Sr-containing Mg17Sr2 and Mg70Zn25Sr5 precipitates. However, the optimum amount of Sr...