Microstructure and mechanical behavior of ultrafine-grained Ni processed by different powder metallurgy methods

J. Gubicza, H. Q. Bui, F. Fellah, G. F. Dirras

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Ultrafine-grained samples were produced from 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 coarsening 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 from microcracking along the grain boundaries.

Original languageEnglish
Pages (from-to)217-226
Number of pages10
JournalJournal of Materials Research
Volume24
Issue number1
DOIs
Publication statusPublished - 2009

Fingerprint

Spark plasma sintering
powder metallurgy
Powder metallurgy
sparks
sintering
hot isostatic pressing
Hot isostatic pressing
microstructure
Microstructure
softening
Microcracking
Nickel oxide
nickel oxides
consolidation
Coarsening
yield strength
Plastic flow
Consolidation
Yield stress
Grain boundaries

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics

Cite this

Microstructure and mechanical behavior of ultrafine-grained Ni processed by different powder metallurgy methods. / Gubicza, J.; Bui, H. Q.; Fellah, F.; Dirras, G. F.

In: Journal of Materials Research, Vol. 24, No. 1, 2009, p. 217-226.

Research output: Contribution to journalArticle

@article{48dbf792c6f34a3fab9dce2677f67791,
title = "Microstructure and mechanical behavior of ultrafine-grained Ni processed by different powder metallurgy methods",
abstract = "Ultrafine-grained samples were produced from 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 coarsening 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 from microcracking along the grain boundaries.",
author = "J. Gubicza and Bui, {H. Q.} and F. Fellah and Dirras, {G. F.}",
year = "2009",
doi = "10.1557/jmr.2009.0010",
language = "English",
volume = "24",
pages = "217--226",
journal = "Journal of Materials Research",
issn = "0884-2914",
publisher = "Materials Research Society",
number = "1",

}

TY - JOUR

T1 - Microstructure and mechanical behavior of ultrafine-grained Ni processed by different powder metallurgy methods

AU - Gubicza, J.

AU - Bui, H. Q.

AU - Fellah, F.

AU - Dirras, G. F.

PY - 2009

Y1 - 2009

N2 - Ultrafine-grained samples were produced from 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 coarsening 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 from microcracking along the grain boundaries.

AB - Ultrafine-grained samples were produced from 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 coarsening 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 from microcracking along the grain boundaries.

UR - http://www.scopus.com/inward/record.url?scp=61749103413&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=61749103413&partnerID=8YFLogxK

U2 - 10.1557/jmr.2009.0010

DO - 10.1557/jmr.2009.0010

M3 - Article

VL - 24

SP - 217

EP - 226

JO - Journal of Materials Research

JF - Journal of Materials Research

SN - 0884-2914

IS - 1

ER -