Effect of carbon based additive on the formation of Mg2Ni-based Nano-crystallites synthesized using high energy ball milling |
Paper ID : 1591-UFGNSM-FULL |
Authors: |
sajjad haghanifar1, seyed farshid kashani bozorg *2 1ghalamchi institute,between Saba & Felestin ,enghelab av.,tehran,iran 2department of metallurgy and materials engineering,faculty of engineering,university of tehran |
Abstract: |
High energy ball milling of three initial ternary powder mixture of 〖Mg〗_1.9 NiC_0.1, 〖Mg〗_1.7 NiC_0.3 and 〖Mg〗_1.5 NiC_0.5 has been carried out in pure argon atmosphere for the synthesis of nano-crystalline powders based on 〖Mg〗_2 Ni intermetallic compound. A planetary ball mill was employed using a ball to powder weight ratio of 20:1 for various milling time of 5, 10, 15, 20 and 30 hours. Characterization of the crystal structure of the milled products using X-ray diffractometry exhibited the formation of 〖Mg〗_2 Ni - based nano-crystallites after ~ 5 milling hours for the 〖Mg〗_1.9 NiC_0.1 powder mixture. But, the formation of 〖Mg〗_2 Ni-based nano-crystallites has been occurred in the case of 〖Mg〗_1.7 NiC_0.3 and 〖Mg〗_1.5 NiC_0.5after 15 and 20 milling hours, respectively. These results show that with increasing the value of carbon in initial mixture of powder, formation kinetics of 〖Mg〗_2 Ni-based nano-crystallites is decreased. Increasing milling time resulted in decreasing mean crystallite size and increasing the lattice strain in all of powder mixture. |
Keywords: |
Mg2Ni, Nano-crystalline, High energy ball miling, C. |
Status : Paper Accepted (Poster Presentation) |