A356-3 wt% ZrB2 composite was prepared by in-situ magnetochemical reaction at x Hz(x = 0, 5, 10, 15) magnetic field frequency, and its dry sliding friction and wear properties were studied. XRD results show that the composite is composed of ZrB2 and aluminum phase. SEM analysis showed that the size and distribution of ZrB2 particles improved with the increase of frequency. The size of ZrB2 particles in the cluster is about 20–100 nm. The hardness test results showed that with the increase of frequency, the hardness of the composite increased to 235.72 Hv. The friction and wear test results show that the friction coefficient and wear rate of the composite material under 10 N load are lower than that under 5 N load, and the lowest values are 0.28112 and 0.50875, respectively. With the increase of frequency, the wear mechanism changes from adhesive wear to abrasive wear. The effect of magnetic field on in-situ reaction is discussed.

The effects of homogenization treatment on the electrical conductivity, tensile strength and microstructure of Al-B electrician round rod were investigated by means of tensile test, optical microscopy(OM), scanning electron microscopy (SEM), energy dispersive spectroscopy(EDS). The results indicate that during homogenization the grain boundary of samples became thinner, microstructure was more compact and well-distributed. As-cast Al electrician round rod has favorable comprehensive properties under homogenization at 430 for 3 h, the electrical ℃ conductivity and tensile strength reach to 58.1%IACS and 100MPa, respectively. Compared to the sample without homogenization, the electrical conductivity increased by 2.1%IACS in the case of tensile strength was not reduced. After 83% rolling processing of specimen with better comprehensive performance, the electrical conductivity and tensile strength of samples reach to 55.24%IACS and 209MPa, respectively.