Effect of Milling Time on the Properties of Nanocrystalline CuCr50 Alloys

Abstract:

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Nanocrystalline CuCr50 alloys were fabricated by means of mechanical alloying and spark plasma sintering. The influence of milling time on the as-milled powders and properties of sintered compacts were investigated. The results show that crystallite size of powders decreases gradually with increase of milling time, while the micro-strain increases firstly then decreases correspondingly. The crystallite size is 22 nm at milling 100h.The micro-hardness of the compacts improves greatly with the increase of milling time, reaching 363HV at 150h which is about 3 times as high as that of the industrial standard (120HV), while the electrical conductivity improves gradually decline. The bulk nanocrystalline CuCr50 alloys sintered at 900°C for 5min exhibit high relative density of 96% and uniform microstructure: nanoparticles Cr with size of about 120nm are uniformly dispersed in the matrix.

Info:

Periodical:

Advanced Materials Research (Volumes 299-300)

Edited by:

Jianzhong Wang and Jingang Qi

Pages:

824-827

DOI:

10.4028/www.scientific.net/AMR.299-300.824

Citation:

K. Y. Shi et al., "Effect of Milling Time on the Properties of Nanocrystalline CuCr50 Alloys", Advanced Materials Research, Vols. 299-300, pp. 824-827, 2011

Online since:

July 2011

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Price:

$35.00

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