The Effects of Sintering Temperature on the Densification of Mechanically Alloyed W-Brass Composites

Baba Gowon; Kahtan S. Mohammed; Shamsul Baharin Bin Jamaluddin; Zuhailawati Hussain; Polycarp Evarastics

doi:10.4236/ojmetal.2015.53003

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Open Journal of Metal > Vol.5 No.3, September 2015

The Effects of Sintering Temperature on the Densification of Mechanically Alloyed W-Brass Composites ()

Baba Gowon^1,2*, Kahtan S. Mohammed¹, Shamsul Baharin Bin Jamaluddin¹, Zuhailawati Hussain³, Polycarp Evarastics¹

¹School of Materials Engineering, Universiti Malaysia Perlis (UniMAP), D/A Pajabat Pos Besar, Kangar, Malaysia.
²Department of Metallurgical and Materials Engineering, Federal Polytechnic, Idah, Nigeria.
³School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Malaysia.

DOI: 10.4236/ojmetal.2015.53003 PDF HTML XML 3,227 Downloads 4,110 Views Citations

Abstract

Prealloyed (PA) and premixed (PM) W-brass with the composition of 60 wt% W, 1 wt% Ni and 39 wt% brass was sintered at the temperature of 800°C, 920°C and 1000°C each. As a result of difficulties in the densification of W-Cu and W-Cu alloys, mechanical alloying (MA) and activated sintering were combined. The powders were mechanically alloyed for 13 hours to produce nanosized W grains embedded in brass. The microstructure and properties of these composites with increase in sintering temperature has been studied. Both prealloyed and premixed composites sintered at 800°C (solid state sintering) and 920°C (sub-solidus state sintering) have lower sintered densities and hardness. The densification rate in the premixed composites was observed to be higher than that of the prealloyed composites. Their densification and properties increased with the increase in the sintering temperature. Premixed composite sintered at 1000°C had 91.0% sintered density, 180 Hv microhardness against 76.0% and 133 Hv respectively for prealloyed composite at the same temperature. The values of electrical conductivity in both prealloyed and premixed composites increased with increase in temperature.

Keywords

W-Brass, Temperature, Densification, Prealloy, Hardness

Share and Cite:

Gowon, B. , Mohammed, K. , Jamaluddin, S. , Hussain, Z. and Evarastics, P. (2015) The Effects of Sintering Temperature on the Densification of Mechanically Alloyed W-Brass Composites. Open Journal of Metal, 5, 19-26. doi: 10.4236/ojmetal.2015.53003.

Conflicts of Interest

The authors declare no conflicts of interest.

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