The authors report an unexpected anisotropy in tensile properties of a polycrystalline nickel-base superalloy after hot extrusion. The tensile strength of longitudinal specimens (parallel to extrusion direction) is 170–276 MPa higher than that of the transverse counterparts at the temperature ranging from 25 to 750°C. Microstructural investigation excludes possible causes leading to this phenomenon such as variation in the grain size, texture, and γ′ precipitates in two orientations. However, further transmission electron microscopy observation reveals that plenty of twins uniquely exist in longitudinal tensile samples after deformation which are probably responsible for the mechanical gap between the two orientations.
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This work was supported by the National High-Tech Research and Development Program of China (863 Program under agreement/grant no. 2012AA03A514). The authors are grateful to Dr. Yan Chong at Lawrence Berkeley National Laboratory for the fruitful discussion.
The supplementary material for this article can be found at https://doi.org/10.1557/mrc.2019.146.
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Liu, X., Huang, Z. & Jiang, L. Anisotropic behavior of tensile properties in a hot-extruded polycrystalline nickel-base superalloy. MRS Communications 9, 1349–1354 (2019). https://doi.org/10.1557/mrc.2019.146