The Microstructures And Properties Of Al-Zr-B-Er Heat-resistant Aluminum Alloy Wires Prepared By Continuous ECAE Dynamic Aging Forming

This paper aims to study the effect of the Er(rare earth element) content on the physical and mechanical properties of Al-Zr-B alloy by taking advantage of conventional optical microscope(OM), scanning electron microscope(SEM) with EDS equipments, QJ-485 D.C. double bridge, testing machine, electric heat drying box and so on. The Al-Zr-B-Er heat-resisting alloys with different Er contents were prepared by a series of mix designing, casting and continuous dynamic Equal Channel Angular Extrusion(ECAE) processes. The results were as follows:(1) The dynamic Equal Channel Angular Extrusion(ECAE) process was simulation calculated by using Defrom-3D finite element software. In the friction coefficients of 0.120 and 0.140 conditions, the stress of the extrusion billets with clearance was smaller than that without clearance. Moreover, the former condition of lower friction was more favorable to production due to lower stress and temperature changes.(2) The chemical composition of the alloy was optimized as Al-0.14Zr-0.06B-0.20 Er, which the tensile strength was 155.7 Mpa, the equivalent conductivity 60.2% IACS(20 ℃) as well as the survival rate of tensile strength 95.1%.the mechanical, conductive and heat resistant properties of the alloy wined satisfaction.(3) The aging treatment has effective improving the metallic mechanical and conductive properties. The aging temperature was separately determined as 160 ℃,180 ℃,180 ℃ and 220 ℃, and aging duration 2 h, 4 h, 6 h, 8 h, 10 h and 12 h. the best mechanical and conductive properties were obtained on the conditions of 220 ℃aging temperature and 12 h aging duration, which the tensile strength was 161.1 Mpa, the equivalent conductivity 60.2% IACS and the survival rate of tensile strength 90.31%.