粉末冶金Al3(Zr,Ti)/Al复合材料的组织与性能

为了研究Zr含量变化对Al-Ti-Zr铝基复合材料组织与力学性能的影响,以纯Al粉末作为基体材料,纯Ti粉和纯Zr粉作为增强体材料,采用粉末冶金原位合成法在750℃烧结制备了Al-Ti-Zr复合材料。随后将烧结制备的复合材料加热到400℃进行热压变形处理,测试其组织和性能的变化。结果表明:在Al-Ti-Zr三元体系中,复合材料内部通过置换反应生成Al3(Zr,Ti)化合物;随着Zr含量的增加,复合材料的组织更加均匀、致密化,其抗拉强度、硬度逐渐增加,抗拉强度最大值为227.66 MPa,硬度最大值为132.83 HV0.025;复合材料的耐腐蚀性能随着Zr含量的增加呈现下降趋势,在Zr含量为5%时,复合材料的耐腐蚀性能最佳,其腐蚀电位为-0.67661 V,腐蚀电流密度为1.0214×10^-6 A/cm^2。

Microstructure and properties of powder metallurgy Al3(Zr,Ti)/Al composites

In order to study the effect of Zr content on microstructure and mechanical properties of Al-Ti-Zr aluminum matrix composites, Al-Ti-Zr composites were prepared by in situ powder metallurgy sintering at 750 ℃ using pure Al powder as matrix material and pure Ti powder and pure Zr powder as reinforcements. Then the sintered composites were heated to 400 ℃ for hot pressing deformation, and the microstructure and properties of the composites were tested. The results show that Al3(Zr,Ti) compounds are formed by substitution reaction in Al-Ti-Zr ternary system. With the increase of Zr content, the microstructure of the composites is more uniform and densified, the tensile strength and hardness of the composites increase gradually, and the maximum tensile strength is 227.66 MPa, the maximum hardness is 132.83 HV0.025. The corrosion resistance of the composites decreases with the increase of Zr content. When the Zr content is 5%, the corrosion resistance of the composites is the best, the corrosion potential is-0.67661 V, and the corrosion current density is 1.0214×10^-6 A/cm^2.