摘要
Multi-wall carbon nanotubes reinforced Mg-14Li-1Al composite(MWCNTs/Mg-14Li-1Al) was prepared by the processes of electrophoretic deposition, friction stir processing, and cold rolling. The microstructure and mechanical properties of the composite were investigated. The results show that, the microhardness of the composite is up to HV 84.4, which is 91.38% higher than that of the as-cast matrix alloy(HV 44.1). The yield strength and ultimate tensile strength of the composite are 259 and 313 MPa, which are 135.45% and 115.86% higher than those of the as-cast matrix alloy, respectively, and a high specific strength of 221.98 k N·m/kg is obtained. In the composite, the MWCNTs serve as nucleation particles during the friction stir processing and cold rolling, causing dynamic recrystallization and grain refinement. Furthermore, MWCNTs hinder the movement of dislocations and transfer the load from the matrix alloy, thus improving the strength.
采用电泳沉积技术、搅拌摩擦加工和冷轧工艺制备多壁碳纳米管增强Mg-14Li-1Al复合材料(MWCNTs/Mg-14Li-1Al),研究复合材料的显微组织和力学性能。结果表明,该复合材料的显微硬度可达HV 84.4,比铸态基体合金(HV 44.1)提高了91.38%;其屈服强度和极限抗拉强度分别为259 MPa和313 MPa,分别比铸态基体合金提高了135.45%和115.86%,比强度高达221.98 k N·m/kg。MWCNTs在搅拌摩擦加工和冷轧过程中作为形核颗粒,引起动态再结晶和晶粒细化。此外,MWCNTs的加入可以阻碍位错运动和传递基体载荷,从而提高合金的强度。
基金
supported by the National Natural Science Foundation of China (Nos. 51871068, 51971071, 52011530025, and U21A2049)
the National Key Research and Development Program of China (No. 2021YFE0103200)
the Zhejiang Province Key Research and Development Program, China (No. 2021C01086)
the Fundamental Research Funds for the Central Universities, China (No. 3072021CFT1010)。
