Mechanism of improving strength and damping properties of powder-extruded Al/Zn composite after diffusion annealing

作者：Zhang, Zhi-hao; Xiao, Fei; Wang, You-wei; Jiang, Yan-bin^*

来源：Transactions of Nonferrous Metals Society of China, 2018, 28(10): 1928-1937.

DOI：10.1016/S1003-6326(18)64838-1

• aluminum matrix composites
• fiber reinforcement
• mechanical properties
• damping properties

In order to develop high strength, high damping and low density Al matrix composites, the Al/Zn composite bar samples with Zn mass fraction of 10%-40% were prepared by powder extrusion. The tensile strength and damping properties of the samples are improved by controlling both the Zn/Al diffusion degree and the precipitation of the interfacial phases. The results show that the tensile strength of the samples with Zn mass fraction of 10%-30% increases with the increases of both the Zn content and annealing temperature. When the Zn mass fraction increases to 40%, the tensile strength of the sample remains basically unchanged or decreases slightly, and the plasticity decreases gradually. Alloying of Al matrix and the formation of Zn/Al interface layer are mainly responsible for improving the strength of the annealed samples. The damping properties increase with the increases of both the Zn content and annealing temperature. The Zn/Al eutectoid lamella eliminates the detrimental effects on damping properties due to both alloying of the Al matrix and reduction of pure Zn in the Al matrix. The Al-30% Zn sample annealed at 350 degrees C for 0.5 h has good comprehensive properties, including the tensile strength of 330 MPa, the elongation to failure of 10% and the room-temperature damping properties (tan theta) of 0.025.

• 出版日期2018-10
• 单位北京科技大学