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Mg在高温合金中有重要作用,能延长蠕变第二阶段及第三阶段的持续时间,得到更长的蠕变断裂时间及更高的蠕变塑性,这种作用与Mg在晶界区的偏析及其对晶界区第二相的分布及形态的改善有关~([1])。进一步研究证明,Mg不仅具有晶界偏析倾向,而且具有更大的相界偏析倾向~([2]),它可能对第二相的析出行为产生影响。但是迄今为止,对Mg的相界偏析行为及其影响因素,引起相界偏析的本质均没有更深入的研究。为了逐渐深入了解Mg的偏析行为,有必要做系统的工作,本文首先以Mg在凝固过程中的分布开始研究,以求对Mg的分布及其作用作深入了解。
Mg plays an important role in superalloy, which can prolong the duration of the second and third stages of creep, resulting in longer creep rupture time and higher creep ductility, which is in agreement with the effect of Mg in the grain boundary Segregation and its effect on the distribution and morphological improvement of the second phase in the grain boundary zone (1). Further studies have shown that Mg not only has the tendency of grain boundary segregation but also has a larger tendency of phase segregation ~ ([2]), which may affect the precipitation behavior of the second phase. However, up to now, there has been no further study on the segregation behavior of Mg and its influencing factors, which cause the nature of phase boundary segregation. In order to get a deeper understanding of the segregation behavior of Mg, it is necessary to do systematic work. In this paper, the distribution of Mg in the solidification process begins with a study in order to gain a better understanding of the distribution and the role of Mg.