%0 Journal Article
%T Ball Milling and Annealing of Co-50 at% W Powders
%A A. S. Bolokang
%A M. J. Phasha
%A D. E. Motaung
%J International Journal of Nonferrous Metallurgy
%P 41-46
%@ 2168-2062
%D 2013
%I Scientific Research Publishing
%R 10.4236/ijnm.2013.22006
%X <p style=\"text-align:justify;\">
	<span>Broadening and height reduction of X-ray diffraction peaks were observed after cold-pressing of unmilled Co-W pow</span><span>der mixture. It seems the effect of cold pressing has slightly reduced the lattice parameter of W from 3.165 to 3.143</span><span><span style=\"background-color:#ffffff;font-family:Verdana, Helvetica, Arial;white-space:normal;\">?</span><span style=\"background-color:#ffffff;font-family:Verdana, Helvetica, Arial;white-space:normal;\"></span>. Consequent annealing of unmilled compacts yielded metastable phases. Upon 10 and 20 h ball milling of Co-W powder, no alloying was obtained. </span><span>Although milling did not yield significant crystal changes in W and Co ground state struc</span><span>tures, its effect is evident during subsequent annealing. An eta phase is obtained for the first time from unmilled-an</span><span>nealed Co-W powder mixture in the absence of interstitial elements like carbon, while the milled counterpart yielded the rhombohedral Co<sub>7</sub>W<sub>6</sub>-type phase with composition deviated from stoichiometric value.</span> 
</p>
%K Ball Milling
%K Crystal Structure
%K XRD
%K Annealing
%K Co-W Powder
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=29984