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Study and methods of analysis of mechanically alloyed Cu–Mo powders

AGUILAR, C and ORDONEZ, S and MARIN, J and CASTRO, F and MARTINEZ, V (2007) Study and methods of analysis of mechanically alloyed Cu–Mo powders. Materials Science and Engineering: A, 464 (1-2). p. 288. ISSN 09215093

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The microstructural evolution during mechanical alloying of Cu and Mo was studied. The aim of this work is to study the effect of the milling time on the formation of the solid solution of molybdenum in copper, employing variable amounts of Mo (1 and 8 at.%). The milling was performed under an inert argon atmosphere in a SPEX 8000D mill. Milling times of 4, 8, 25, 50, 75 and 100 h were used keeping a constant ball to powder ratio of 10–1. The effects of milling parameters such as milling time and composition on the synthesis and structure of Cu–Mo powders were investigated using XRD, nanohardness, differential scanning calorimetry (DSC) and TEM. The results show that the grain size and particle size of powders decrease with increasing milling time. Grain size in samples with 8 at.% Mo approached a minimum value of 20 nm after 50 h, and in samples with 1 at.% Mo, 30 nm after 75 h of milling. Nanohardness shows a maximum about 4 GPa for the alloy with 8 at.% of Mo and 100 h of milling. The measured crystallite size by TEM is in good agreement with the value calculated by XRD. Thermal analyses (DSC) showed the temperature intervals where the dynamic recrystallization would take place. According to these results this phenomenon would happen near 350 °C.

Item Type:Article
Subjects:Material Science > Nanofabrication processes and tools
ID Code:7369
Deposited By:M T V
Deposited On:09 Nov 2009 14:30
Last Modified:09 Nov 2009 14:30

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