科研之友
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摘要
In recent years, Sr alloying/micro-alloying was widely used in Mg-Al-based magnesium alloys due to the benefits on modification of secondary phases, grain size refinement and improvement of elevated temperature properties. The recent research works on secondary phases in strontium-contained Mg-Al series magnesium alloys were summarized. With the Sr contents increasing, Al-Sr phases, such as Al4Sr and Al2Sr, form at first, and then Mg-Sr phases, such as (Mg,Al)17Sr2and Mg-Al-Sr ternary phases form, which are confirmed by both of the experimental and modelling results. However, the structure and stoichiometry of the Mg-Al-Sr ternary phase are still controversial. At the same time, the results on mechanical properties and stability of the Sr-containing secondary phases, which were calculated by using CALPHAD thermodynamic modeling and first-principles calculations methods, respectively, also were reviewed. In addition, it is considered that combining these two simulation methods, more accurate binary or ternary phase diagrams of Mg-Al-Sr series could be obtained.
