Study on the Formation of Nano Vacancy Ordered Phases by Mechanical Alloying
T. P. Yadav1, N. K. Mukhopadhyay2, R. S. Tiwari1 and O. N. Srivastava1
1Department of Physics, Banaras Hindu University,
Varanasi-221 005 (India)
2Department of Metallurgical Engineering, Banaras Hindu University,
Varanasi-221 005 (India)
Страницы: 259-264
Аннотация
In the present investigation, the powder mixture of Al (70 at. %), Ni (15 at. %) and Cu (15 at. %) was mechanically milled in an attritor ball mill for 10, 20, 40, 60, 80 and 100 h in hexane medium at 400 rpm. The isothermal annealing of 100 h mechanically milled powder was done at 700 oC for 20, 40 and 60 h. The powders were characterized using X-ray diffraction, differential thermal analysis and transmission electron microscopy techniques. It was observed that mechanical alloying led to the formation of nano vacancy ordered (t3) phase after 80 h of milling. In the case of 100 h mechanical milling (MM) and subsequent annealing at 700 oC for 20, 40 and 60 h, powder exhibited the formation of ordered and perfect t3 phase with larger grain sizes. The phase formation and transformations in the above systems were discussed.
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