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《Journal of University of Jinan(Science and Technology)》 2008-03
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Ni-Al-Fe-Nb Powders Preparated by Mechanicalalloyin

WANG Jun,LI Jia,LI Hong-feng,WEN Yu(School of Materal Science and Engineering,University of Jinan,Jinan 250022,China)  
The characteristics of morphologies and changes of the microstructures in mechanically alloyed Ni-30mol%Al-14mol%Fe-2mol%Nb mixed powder were investigated.We uses QM-ISP2 planet type ball mill to carry on the high-energy ball grinding for 30 hours.The results showed that the width and intensity of X-ray diffraction spectrum increased with ball milling time,which was caused by the reduction of crystal size and the increase of microstrain.With the prolongation of milling time,the crystal size of mixed the powder reduced,while its lattice constant and lattice distortion increased gradually.Powder Ni-30mol%Al-14mol%Fe-2mol%Nb mixture ball ground for 5h namely starts to alloy,but it still maintained the original structure.When ball ground for10h,Al in the sample nearly vanished,the majority of Fe atoms transformed from the original bcc structure to fcc structure.When ball grinding time is 30h,Fe,Al,Nb mutually alloyed,and the sample became even solid solution.The obtained powders looks like near sphere or sphere,and the thermostahility of the obtained compound powder is good.
【Fund】: 国家自然科学基金(50573034);; 山东省博士基金(2006BS04028)
【CateGory Index】: TB383.3
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