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Anisotropic behavior of tensile properties in a hot-extruded polycrystalline nickel-base superalloy

Published online by Cambridge University Press:  06 November 2019

Xiaotao Liu Open the ORCID record for Xiaotao Liu [Opens in a new window] ,
Zaiwang Huang  and
Liang Jiang
Xiaotao Liu
Affiliation:
State Key Laboratory for Powder Metallurgy, Central South University, Changsha, Hunan410083, China National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA94720, USA
Zaiwang Huang*
Affiliation:
State Key Laboratory for Powder Metallurgy, Central South University, Changsha, Hunan410083, China
Liang Jiang
Affiliation:
State Key Laboratory for Powder Metallurgy, Central South University, Changsha, Hunan410083, China Institute for Advanced Studies in Precision Materials, Yantai University, Yantai, Shandong264005, China
*
Address all correspondence to Zaiwang Huang at [email protected]
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Abstract

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.

Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 4 , December 2019 , pp. 1349 - 1354
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Copyright
Copyright © Materials Research Society 2019

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