Effect of Milling Time on the Properties of Nanocrystalline CuCr50 Alloys

Abstract:

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.

• Periodical: Advanced Materials Research (Volumes 299-300)
• Pages: 824-827
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.299-300.824
• Online since: July 2011
• Authors: Kun Yu Shi, Tao Shen, Li Hong Xue, Chun Hao Chen, You Wei Yan
• Keywords: Cu-Cr, Mechanical Alloying (MA), Nanocrystalline, Spark Plasma Sintering (SPS)

References

[1] P. G. Slade: IEEE Trans on CPMT. Vol. 17 (1994), p.96.

[2] F. R. Werner, S. Michael, W. Glatzle, et al: IEEE Trans on CHMT. Vol. 12 (1989), p.273.

[3] B. J. Ding, Z. M. Yang, X. T. Wang: IEEE Trans on CPMT. Vol. 19A (1996), p.76.

[4] C. Suryanarayana: Prog. Mater. Sci. Vol. 46 (2001), p.32.

[5] Y.P. Wang, B.J. Ding: IEEE Trans on CPMT. Vol. 22(1999), p.467.

[6] G.Y. Fu, Y. Niu, F. Gesmundo: Corros Sci. Vol. 45(2003), p.559.

[7] I. Lahiri, S. Bhargava: Powder Technol. Vol. 189 (2009), p.433.

[8] S.D. Dela Torre , D. Oleszak, et al: Mater. Sci. Eng. A. Vol. 276(2000), p.226.

[9] Y.Y. Chen, H.B. Yu, et al: Mater. Sci. Eng. A. Vol. 525(2009), p.166.