High specific strength MWCNTs/Mg-14Li-1Al composite prepared by electrophoretic deposition, friction stir processing and cold rolling  

电泳沉积、搅拌摩擦加工和冷轧制备高比强度MWCNTs/Mg-14Li-1Al复合材料

作　　者：Lin XU Jia-hao WANG Rui-zhi WU Chun-bo ZHANG Hua-jie WU Le-gan HOU Jing-huai ZHANG 徐林;王佳豪;巫瑞智;张春波;武华杰;侯乐干;张景怀(哈尔滨工程大学超轻材料与表面技术教育部重点实验室,哈尔滨150001;黑河学院理学院,黑河164300;哈尔滨焊接研究院有限公司,哈尔滨150001)

机构地区：[1]Key Laboratory of Superlight Materials&Surface Technology,Ministry of Education,Harbin Engineering University,Harbin 150001,China [2]College of Science,Heihe University,Heihe 164300,China [3]Harbin Welding Institute Limited Company,Harbin 150001,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第12期3914-3925,共12页中国有色金属学报（英文版）

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)。

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。

关 键 词：metal matrix composites Mg-Li alloy multi-wall carbon nanotubes electrophoretic deposition friction stir processing ROLLING strengthening mechanism 

分 类 号：TB333[一般工业技术—材料科学与工程]