Effects of Al 2O 3 addition on the microstructure and properties of Ni activated sintered W matrix composites

Ö Utku Demirkan, Aziz Genç*, M. Lütfi Öveçoǧlu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

In the present investigation, fabrication of high dense (> 97.8%) W matrix composites with increased microhardness values were investigated. W and W-1 wt.% Ni powders were mechanical alloyed for 18 h and sintered at 1400°C for 1 h under Ar, H 2 gas flowing conditions in order to investigate the effects of 1 wt.% Ni addition on the densification and properties of W. The effects of Al 2O 3 particles additions on the microstructural and physical properties of the sintered W-1 wt.% Ni sample were investigated. A 92.59% relative density value of the sintered W sample increased to 99.47% with the addition of 1 wt.% Ni. Moreover, despite the observed grain growth, microhardness values significantly increased from 2.81 ± 0.34 GPa to 4.07 ± 0.16 GPa with the addition of 1 wt.% Ni. The relative density values of the sintered W-1 wt.% Ni sample slightly decreased with increasing Al 2O 3 additions, a relative density value of 97.81% was measured for the W-1 wt.% Ni sample reinforced with 2 wt.% Al 2O 3 particles. As the average grain size of W in the sintered W-1 wt.% Ni sample decreased from 4.41 ± 1.71 μm to 1.29 ± 0.39 μm with the addition of 2 wt.% Al 2O 3 particles, the microhardness of the sample increased to 5.98 ± 0.31 GPa.

Original languageEnglish
Pages (from-to)33-38
Number of pages6
JournalInternational Journal of Refractory Metals and Hard Materials
Volume32
DOIs
Publication statusPublished - May 2012

Funding

The authors would like to express their gratitude to State Planning Organization (DPT) for funding the project entitled “Advanced Technologies in Engineering” with the project number 2001K120750 out of which the main infrastructure of the Particulate Materials Laboratories was founded. The present study is one of the outcomes of a research project entitled “Development of Tungsten based Hybrid Composites via Activated Sintering and Mechanical Alloying using High Energy Milling at Cryogenic and Ambient Conditions and Related Characterization Investigations” funded by the Scientific and Research Council of Turkey (TÜBİTAK) with the project number 110M130 .

FundersFunder number
DPT2001K120750
Scientific and Research Council of Turkey
TÜBİTAK110M130
Devlet Planlama Örgütü

    Keywords

    • Activated sintering
    • Al O
    • Mechanical alloying
    • W

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