Journal
MATERIALS CHARACTERIZATION
Volume 79, Issue -, Pages 76-83Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2013.02.013
Keywords
Nickel; Powder metallurgy; Microstructure; Mechanical properties
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Funding
- French National Research Agency (ANR) in the framework of the MIMIC Project [ANR 09-BLAN-0010]
- Agence Nationale de la Recherche (ANR) [ANR-09-BLAN-0010] Funding Source: Agence Nationale de la Recherche (ANR)
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The present work focuses on room temperature mechanical properties and deformation mechanisms of bulk polycrystalline nickel processed from a high purity micrometre-sized powder by means of spark plasma sintering. Optimisation of the conditions yielded bulk samples having a relative density ranging from 97 to about 99% and an average grain size in the range 5-45 mu m. EBSD experiments were carried out to characterise the microstructure of as-processed sample before and after room temperature compression tests. The microstructure investigations prior to compression tests revealed a high density of high-angle grain boundaries (HAGBs); a large fraction of them are Sigma 3 boundaries (20 to 52% depending on the sample), the majority of which are twin boundaries (TBs). Compression tests (at a strain rate of 10(-3) s(-1)) at fixed amount of strains (5, 8 and 50%) result in an increase of the amount of low-angle grain boundaries, probably as a consequence of an intense dislocation activity. As for HAGBs, the more prominent effects occur for Sigma 3 boundaries and TBs for which a sharp decrease in the course of deformation is found. This was attributed to interaction with dislocations that possibly induce misorientation changes across boundaries (e.g., TBs) as well as their partial disruption as evidenced by EBSD investigations. (c) 2013 Elsevier Inc. All rights reserved.
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