High-temperature compression tests were performed on a Ni-base superalloy with a multi-phase microstructure. Particular attention was given on the influence of the η phase on recrystallization of ATI 718Plus®. The compression tests were performed at two temperatures over a variety of strains and strain rates. Meta-dynamic recrystallization was studied by exposing the samples to a set dwell time at the test temperature after deformation. Electron backscatter diffraction (EBSD) was used to investigate the microstructures after the tests. Secondary electron imaging (SEI) and scanning transmission electron microscopy (STEM) were utilized in order to investigate the deformation behavior of η and obtaining a detailed understanding of the recrystallization mechanism. The secondary η phase was found to increase the recrystallized fraction compared to η free tests. However, clusters of thin lamellar η inhibited recrystallization. The flow curve softening was distinctly stronger in the microstructure containing precipitates. It could be shown by SE images that this was due to the breakage and realignment of η. In addition, η was also found to accommodate the stresses by a remarkable deformation without breaking up. This was considered to be due to the composite nature of the precipitate as well as the ongoing recrystallization in the surrounding matrix.

在具有多相微结构的镍基高温合金上进行了高温压缩试验。特别注意了η相对ATI718Plus®重结晶的影响。压缩测试是在两种温度下以各种应变和应变速率进行的。通过将样品在变形后的测试温度下暴露于设定的停留时间来研究亚动态重结晶。测试后，使用电子背散射衍射（EBSD）研究微观结构。为了研究η的变形行为并获得对重结晶机理的详细了解，利用了二次电子成像（SEI）和扫描透射电子显微镜（STEM）。中学与无η试验相比，发现η相增加了重结晶分数。但是，薄层η的团簇抑制了重结晶。在包含沉淀物的微观结构中，流动曲线软化明显更强。SE图像可以表明这是由于η的断裂和重新排列所致。另外，还发现η通过显着的变形而承受应力而不会破裂。认为这是由于沉淀物的复合性质以及周围基质中正在进行的重结晶所致。