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Materials 2013, 6(2), 437-444; doi:10.3390/ma6020437

Crystallographic Orientation Influence on the Serrated Yielding Behavior of a Single-Crystal Superalloy

1
Department of Management and Engineering, Linköping University, Linköping 58183, Sweden
2
Siemens Industrial Turbomachinery AB, Finspång 61283, Sweden
*
Author to whom correspondence should be addressed.
Received: 9 November 2012 / Revised: 10 January 2013 / Accepted: 29 January 2013 / Published: 31 January 2013
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Abstract

Since Ni-based single-crystal superalloys are anisotropic materials, their behavior in different crystal orientations is of great interest. In this study, the yielding behavior in both tension and compression for ,  and  oriented materials at 500 °C has been investigated. The  direction showed a serrated yielding behavior, a great tension/compression asymmetry in yield strength and visible deformation bands. However, the  and  directions showed a more homogeneous yielding, less tension/compression asymmetry in yield strength and no deformation bands. Microstructure investigations showed that the serrated yielding behavior of the  direction can be attributed to the appearance of dynamic strain aging (DSA) and that only one slip system is active in this direction during plastic deformation.
Keywords: single-crystals; superalloy; yield phenomena; tension/compression asymmetry; dynamic strain aging single-crystals; superalloy; yield phenomena; tension/compression asymmetry; dynamic strain aging
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Segersäll, M.; Moverare, J.J. Crystallographic Orientation Influence on the Serrated Yielding Behavior of a Single-Crystal Superalloy. Materials 2013, 6, 437-444.

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