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Deformation mechanisms at intermediate creep temperatures in the Ni-base superalloy Rene 88 DT

机译:Ni基高温合金Rene 88 DT在中等蠕变温度下的变形机制

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Creep deformation substructures in superalloy Rene 88 DT have been investigated at two applied stress levels after small-strain (0.5%) creep at 650℃ using conventional and high resolution transmission electron microscopy. Clear differences in creep strength and substructures have been observed as a function of applied stress. It has been established that at intermediate temperatures microtwinning caused by the passage of Shockley partial dislocations on successive {111} planes is the dominant deformation process at low applied stress. At higher applied stress the mechanism changes to planar shearing of the matrix by 1/2 < 110 > unit dislocations and Orowan looping of the precipitates. Detailed experimental evidences for these operating processes are shown and possible explanation is provided.
机译:使用常规和高分辨率透射电子显微镜研究了在650℃小应变(0.5%)蠕变后,在两个外加应力水平下,超级合金Rene 88 DT的蠕变变形子结构。已经观察到蠕变强度和子结构的明显差异是施加应力的函数。已经确定,在中间温度下,由肖克利局部位错在连续的{111}平面上通过引起的微孪晶是在低施加应力下的主要变形过程。在较高的施加应力下,该机理通过1/2 <110>单位位错和析出物的Orowan循环转变为基体的平面剪切。显示了这些操作过程的详细实验证据,并提供了可能的解释。

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