Microstructural characterizations of Ni activated sintered W-2 wt% TiC composites produced via mechanical alloying

A. Genç; S. Coşkun; M. L. Öveçoǧlu

doi:10.1016/j.jallcom.2010.03.008

Microstructural characterizations of Ni activated sintered W-2 wt% TiC composites produced via mechanical alloying

A. Genç^*, S. Coşkun, M. L. Öveçoǧlu

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

Istanbul Technical University

Research output: Contribution to journal › Article › peer-review

37 Citations (Scopus)

Abstract

Blended W-2 wt% TiC powders were mechanically alloyed (MA'd) for 3 h, 6 h, 12 h and 24 h in a Spex Mixer/mill at room temperature. 1 wt% Ni was added as sintering aid after mechanical alloying to investigate the coupled effects of MA and activated sintering. MA'd powders were sintered at 1400 °C for 1 h under Ar, H₂ gas flowing conditions. Microstructural and phase characterizations of MA'd powders and sintered samples were carried out via SEM, TEM and XRD analyses. Whereas XRD investigations on MA'd powders revealed stable W and WC phases, those on sintered samples showed the presence of Ni in addition to the matrix W phase. TEM investigations on MA'd and sintered samples revealed the presence of the matrix W, TiC_0.62, Ni₄W and W₂C particles. Relative density values were about 94.2% for all sintered composites which did not change with MA, indicating that distribution of Ni is the dominant factor on densification. Microhardness values of the sintered composites varied between 5.4 GPa and 6.0 GPa which increased with increasing MA duration.

Original language	English
Pages (from-to)	80-89
Number of pages	10
Journal	Journal of Alloys and Compounds
Volume	497
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2010.03.008
Publication status	Published - 14 May 2010

Funding

The authors wish to thank Ms. Çiğdem Çakır Konak for her help in the SEM and TEM investigations and Dr. Özgür Duygulu for his help in TEM investigations. This study has been a part of a project entitled “Development of polymer composite and sinter products using tungsten based nanostructured and nanocomposite powders fabricated via mechanical alloying and mechanochemical techniques” with the project number 105M065 funded by the Scientific and Research Council of Turkey (TÜBİTAK). Further, we would like to express our 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.

Funders	Funder number
DPT	2001K120750
Scientific and Research Council of Turkey
TÜBİTAK
Devlet Planlama Örgütü

Keywords

Activated sintering
Mechanical alloying
Microstructure
Transmission electron microscopy (TEM)
W-TiC

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10.1016/j.jallcom.2010.03.008

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title = "Microstructural characterizations of Ni activated sintered W-2 wt\% TiC composites produced via mechanical alloying",

abstract = "Blended W-2 wt\% TiC powders were mechanically alloyed (MA'd) for 3 h, 6 h, 12 h and 24 h in a Spex Mixer/mill at room temperature. 1 wt\% Ni was added as sintering aid after mechanical alloying to investigate the coupled effects of MA and activated sintering. MA'd powders were sintered at 1400 °C for 1 h under Ar, H2 gas flowing conditions. Microstructural and phase characterizations of MA'd powders and sintered samples were carried out via SEM, TEM and XRD analyses. Whereas XRD investigations on MA'd powders revealed stable W and WC phases, those on sintered samples showed the presence of Ni in addition to the matrix W phase. TEM investigations on MA'd and sintered samples revealed the presence of the matrix W, TiC0.62, Ni4W and W2C particles. Relative density values were about 94.2\% for all sintered composites which did not change with MA, indicating that distribution of Ni is the dominant factor on densification. Microhardness values of the sintered composites varied between 5.4 GPa and 6.0 GPa which increased with increasing MA duration.",

keywords = "Activated sintering, Mechanical alloying, Microstructure, Transmission electron microscopy (TEM), W-TiC",

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AU - Genç, A.

AU - Coşkun, S.

AU - Öveçoǧlu, M. L.

PY - 2010/5/14

Y1 - 2010/5/14

N2 - Blended W-2 wt% TiC powders were mechanically alloyed (MA'd) for 3 h, 6 h, 12 h and 24 h in a Spex Mixer/mill at room temperature. 1 wt% Ni was added as sintering aid after mechanical alloying to investigate the coupled effects of MA and activated sintering. MA'd powders were sintered at 1400 °C for 1 h under Ar, H2 gas flowing conditions. Microstructural and phase characterizations of MA'd powders and sintered samples were carried out via SEM, TEM and XRD analyses. Whereas XRD investigations on MA'd powders revealed stable W and WC phases, those on sintered samples showed the presence of Ni in addition to the matrix W phase. TEM investigations on MA'd and sintered samples revealed the presence of the matrix W, TiC0.62, Ni4W and W2C particles. Relative density values were about 94.2% for all sintered composites which did not change with MA, indicating that distribution of Ni is the dominant factor on densification. Microhardness values of the sintered composites varied between 5.4 GPa and 6.0 GPa which increased with increasing MA duration.

AB - Blended W-2 wt% TiC powders were mechanically alloyed (MA'd) for 3 h, 6 h, 12 h and 24 h in a Spex Mixer/mill at room temperature. 1 wt% Ni was added as sintering aid after mechanical alloying to investigate the coupled effects of MA and activated sintering. MA'd powders were sintered at 1400 °C for 1 h under Ar, H2 gas flowing conditions. Microstructural and phase characterizations of MA'd powders and sintered samples were carried out via SEM, TEM and XRD analyses. Whereas XRD investigations on MA'd powders revealed stable W and WC phases, those on sintered samples showed the presence of Ni in addition to the matrix W phase. TEM investigations on MA'd and sintered samples revealed the presence of the matrix W, TiC0.62, Ni4W and W2C particles. Relative density values were about 94.2% for all sintered composites which did not change with MA, indicating that distribution of Ni is the dominant factor on densification. Microhardness values of the sintered composites varied between 5.4 GPa and 6.0 GPa which increased with increasing MA duration.

KW - Activated sintering

KW - Mechanical alloying

KW - Microstructure

KW - Transmission electron microscopy (TEM)

KW - W-TiC

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DO - 10.1016/j.jallcom.2010.03.008

M3 - Article

AN - SCOPUS:77950920353

SN - 0925-8388

VL - 497

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JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 1-2

ER -

Microstructural characterizations of Ni activated sintered W-2 wt% TiC composites produced via mechanical alloying

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Keywords

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