含鍶Mg-Al系鎂合金中第二相研究述評(píng)

含鍶Mg-Al系鎂合金中第二相研究述評(píng)Review of secondary phases in strontium-contained Mg-Al series magnesium alloys

鍶元素加入到鎂合金中能夠起到變質(zhì)第二相，顯著細(xì)化晶粒以及提高其高溫力學(xué)性能的效果，已被廣泛應(yīng)用于Mg-Al系鎂合金中。綜述了國(guó)內(nèi)外在含鍶Mg-Al系合金中的第二相研究現(xiàn)狀，實(shí)驗(yàn)研究結(jié)果和第一性原理計(jì)算結(jié)果均表明，隨著Sr含量的增加，Mg-Al系合金中將首先出現(xiàn)Al-Sr相(Al4Sr相和/或Al2Sr相)，然后再出現(xiàn)Mg-Sr相((Mg,Al)17Sr2相)和/或Mg-Al-Sr三元相。但是，其中Mg-Al-Sr三元相的結(jié)構(gòu)和類型尚存在爭(zhēng)議。綜述相圖熱力學(xué)計(jì)算以及第一性原理計(jì)算方法在含鍶Mg-Al系合金中第二相研究方面的結(jié)果，將第一性原理計(jì)算與相圖熱力學(xué)模擬有機(jī)結(jié)合起來(lái)，可以獲得更為準(zhǔn)確的含鍶鎂合金二元或三元系相圖。

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)17Sr2 and 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.

全文下載：https://pan.baidu.com/s/1bpi2o0J