Microstructure and Properties of Nano Al2O3-Cu/Cr Composite

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The nano Al2O3 -Cu/Cr composite was prepared by a simplified internal oxidation technique of the vacuum hot-press sintering-internal oxidizing method. The tensile strength and microhardness were determined respectively. The microstructures were analyzed by means of a scanning electron microscope (SEM). On the basis of above results, the main strengthening mechanisms were investigated by quantitative calculation of several strengthening effects. The experimental results show that the microhardness and tensile strength obviously increase with increased cold deformation. The main strengthening mechanisms of the nano Al2O3 -Cu/Cr composites are mainly attributed to the dispersion of the nano-scale of alumina particles and the aggregate of the Cr particle phase, of which the former can restrict the mobility of the dislocations and increase the density of dislocations. Meanwhile, the cold deformation strengthening has some important effect to a certain extent.

Info:

Periodical:

Advanced Materials Research (Volumes 284-286)

Main Theme:

Edited by:

Xiaoming Sang, Pengcheng Wang, Liqun Ai, Yungang Li and Jinglong Bu

Pages:

387-391

DOI:

10.4028/www.scientific.net/AMR.284-286.387

Citation:

B. H. Tian et al., "Microstructure and Properties of Nano Al2O3-Cu/Cr Composite", Advanced Materials Research, Vols. 284-286, pp. 387-391, 2011

Online since:

July 2011

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Price:

$35.00

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