Journal
JOURNAL OF MATERIALS RESEARCH
Volume 24, Issue 1, Pages 217-226Publisher
MATERIALS RESEARCH SOC
DOI: 10.1557/JMR.2009.0010
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Funding
- Hungarian TeT Foundation (KPI) [F-47/2006]
- Hungarian Scientific Research Fund [K67692, K71594]
- Hungarian Academy of Sciences
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Ultrafine-grained samples were produced front a Ni nanopowder by hot isostatic pressing (HIP) and spark plasma sintering (SPS). The microstructure and mechanical behavior of the two specimens were compared. The grain coarsen in observed during the SPS procedure was moderated due to a reduced temperature and time of consolidation compared with HIP processing. The smaller grain-size and higher nickel-oxide content in the SPS-processed sample resulted in a higher yield strength. Compression experiments showed that the specimen produced by SPS reached a maximal flow stress at a small strain, which was followed by a long steady-state softening while the HIP-processed sample hardened until failure. It was revealed that the softening of the SPS-processed sample resulted front microcracking along the grain boundaries.
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