含锶Mg-Al系镁合金中第二相研究述评

发布时间：2018-12-18 02:53

【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。
[Abstract]:The addition of strontium into magnesium alloys can modify the second phase, refine the grains and improve the mechanical properties at high temperature. It has been widely used in Mg-Al magnesium alloys. The research status of the second phase in strontium-containing Mg-Al alloys at home and abroad is reviewed. The experimental results and first principle calculation results show that with the increase of Sr content, The Al-Sr phase (Al_4Sr phase and / or Al_2Sr phase) and then the Mg-Sr phase (Mg,Al) _ (17) Sr_2 phase) and / or Mg-Al-Sr ternary phase will appear in the Mg-Al alloy. However, the structure and type of Mg-Al-Sr ternary phase are still controversial. The results of phase diagram thermodynamics calculation and first-principle calculation method in the study of the second phase in strontium containing Mg-Al alloy are summarized. The first principle calculation and the thermodynamic simulation of phase diagram are organically combined. A more accurate binary or ternary phase diagram of strontium-containing magnesium alloy can be obtained.
【作者单位】：四川工程职业技术学院材料工程系;重庆大学国家镁合金材料工程技术研究中心;重庆理工大学材料科学与工程学院;中国核动力研究设计院核燃料及材料国家重点实验室;
【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)~~
【分类号】：TG146.22

【相似文献】