摘要
锶元素加入到镁合金中能够起到变质第二相,显著细化晶粒以及提高其高温力学性能的效果,已被广泛应用于Mg-Al系镁合金中。综述了国内外在含锶Mg-Al系合金中的第二相研究现状,实验研究结果和第一性原理计算结果均表明,随着Sr含量的增加,Mg-Al系合金中将首先出现Al-Sr相(Al_4Sr相和/或Al_2Sr相),然后再出现Mg-Sr相((Mg,Al)_(17)Sr_2相)和/或Mg-Al-Sr三元相。但是,其中Mg-Al-Sr三元相的结构和类型尚存在争议。综述相图热力学计算以及第一性原理计算方法在含锶Mg-Al系合金中第二相研究方面的结果,将第一性原理计算与相图热力学模拟有机结合起来,可以获得更为准确的含锶镁合金二元或三元系相图。
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 Al_4Sr and Al_2Sr, form at first, and then Mg-Sr phases, such as(Mg,Al)_(17)Sr_2 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.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2017年第9期1757-1767,共11页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51474043)
科技部国际合作资助项目(2014DFG52810)
中国博士后科学基金资助项目(2015M582575)
四川省国际科技合作与交流计划资助项目(2016HH0014)~~
关键词
镁合金
锶
第二相
第一性原理
相图计算
magnesium alloys
strontium
secondary phases
first-principles
calphad calculation
