作　　者： (孟延军）; (尹素花）; (董中奇）; (付俊薇）; (王杨）;

机构地区： 河北工业职业技术学院材料工程系,河北石家庄050000

出　　处： 《铸造技术》 2017年第9期2205-2207,2211,共4页

摘　　要： 研究了电弧熔炼过程中LaFe_(10.5)Si_(2.5)合金的凝固行为。应用XRD和扫描电镜分析了合金组织相组成和结构。结果表明:温度梯度和成分偏析造成LaFe_(10.5)Si_(2.5)合金铸锭显微组织大致分成了五层,从样品四周到中部,析出1∶13相形貌依次为树枝状、椭圆状、柱状、等轴状和羽毛状枝晶;LaFe_(10.5)Si_(2.5)合金铸锭中1∶13相析出方式应该有两种,直接析出形成树枝状、椭圆状、柱状,1∶13相包裹α-Fe相形成包晶相析出。 Solidification behavior of LaFe_（10.5）Si_（2.5） alloys was investigated in arc melting. Phase formation and structure of LaFe_（10.5）Si_（2.5） alloys in arc melting were analyzed by means of power X-ray diffraction analysis （XRD） and scanning electron microscopy （SEM）. The results show that the microstructure of LaFe_（10.5）Si_（2.5） alloy ingot can be roughly divided into five layers caused by the temperature gradient and composition segregation. The precipitation of 1：13 phase morphology is lath shape, elliptical shape, colunmar, equiaxed grains and feather in turn fi＇om around the sample to the central. The precipitation method of 1：13 phase in LaFe_（10.5）Si_（2.5） alloy ingots should have two kinds, one is direct precipitation to form dendritic, elliptic, columnar, peritectic phase, the other is wraping precipitation to form α-Fe phase wrapped by 1：13 phase.

关 键 词： 稀土 电弧熔炼 合金