摘要
采用等离子旋转电极雾化技术制备球形CuAl10Fe3铜合金粉末,利用激光粒度分析仪、O&N分析仪、扫描电子显微镜(SEM)、X射线衍射(XRD)仪和纳米压痕仪对CuAl10Fe3铜合金粉末的粒径分布、氧氮含量、微观形貌、组织物相及纳米硬度和弹性模量特性进行表征。结果表明,CuAl10Fe3粉末的体积平均粒径(D 50)为74μm,松装密度、振实密度和流动性分别为4.45 g/cm^3、4.6 g/cm^3、16.3 s/50 g;其平均氧、氮含量分别为0.024%和0.004%,其中氧含量随CuAl10Fe3粉末粒度的减小而增大,氮含量则基本保持一致。XRD分析表明,CuAl10Fe3粉末主要由α相、马氏体β′相和少量的富铁K相组成。大粒径粉末的表面形貌为快速凝固形成的花瓣状胞状树枝晶。随着粉末粒度的减小,表面形貌由胞状树枝晶向平面晶转变,截面形貌则由大块胞晶向细条状晶转变,且小粒径颗粒截面组织明显细化,纳米硬度和弹性模量也增大。
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 ( D 50 ) of 74 μm, the loose density of 4.45 g/cm 3, the tap density of 4.6 g/cm 3, 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.
作者
黄柯
赵阳
张昌松
王晓明
常青
邱六
关雪飞
HUANG Ke;ZHAO Yang;ZHANG Changsong;WANG Xiaoming;CHANG Qing;QIU Liu;GUAN Xuefei(Department of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi'an 710021;National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing 100072;Yantai Lingshi Software Technology Co. , Ltd. , Yantai 264000)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2019年第22期3783-3788,共6页
Materials Reports
基金
国家重点研发计划(2018YFB1105800)~~
关键词
球形铜合金粉末
等离子旋转电极雾化法
快速凝固
纳米压痕
sphercial copper alloy powders
plasma rotating electrode process (PREP)
rapid solidification
nano-indentation
