1 Department of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi’an 710021 2 National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing 100072 3 Yantai Lingshi Software Technology Co., Ltd., Yantai 264000
Abstract: CuAl10Fe3 spherical copper alloy powders were prepared directly from the master electrode by the plasma rotating electrode processing (PREP). Then, the Laser particle size analyzer, O-N apparatus, scanning electron microscope (SEM) X-ray diffractometer (XRD) and nano-indentation tester were employed to characterize the particle size distribution, content of oxygen and nitrogen, micromorphology, phase composition and nano-hardness and modulus of the CuAl10Fe3 powders. It could be found from the results that the CuAl10Fe3 powders held an average particle size (D50) of 74 μm, the loose density of 4.45 g/cm3, the tap density of 4.6 g/cm3, the flowability of 16.3 s/50 g. The mean content of oxygen and nitrogen were 0.024% and 0.004%, respectively. The decrease of CuAl10Fe3 particle size would give rise to the increase of oxygen concentration and exert no obvious effect on nitrogen content. XRD patterns of the obtained CuAl10Fe3 showed that the powders were primarily composed of α phase, martensite β′phase, and a small amount iron rich K phase. As for the micromorphology of the CuAl10Fe3, powders with large particle size exhibits isometric petal-shaped cellular dendrite resulted from rapid solidification. The decrease of particle size forced the surface morphology of cell dendrites transform into planar crystals, the morphology of the cross section elements vary from the cellular crystal to the fine stripe crystal. Moreover, CuAl10Fe3, powders with small particle size presented a greatly refined cross section structure, as well as improved nano-hardness and modulus.
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2019, Vol. 33 
