Microstructure and mechanical properties of Mg-14Li-1Al/MWCNTs composites prepared by electrophoretic deposition and accumulative roll bonding
Microstructure and mechanical properties of Mg-14Li-1Al/MWCNTs composites prepared by electrophoretic deposition and accumulative roll bonding
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电泳沉积累积辊压制备Mg-14Li-1Al/MWCNTs复合材料的显微组织和力学性能
DOI：
10.1016/j.jmapro.2021.10.040
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发表时间：
2021-12
影响因子：
6.2
通讯作者：
Jinghuai Zhang
中科院分区：
文献类型：
--
作者：
Lin Xu;Jiahao Wang;Ruizhi Wu;Jiaxiu Wang;Huajie Wu;Yang Li;Legan Hou;Jinghuai Zhang
采用电泳沉积-累积叠轧复合（ARB）工艺制备了Mg-14 Li-1Al/MWCNTs复合材料。通过拉伸试验、显微硬度测试、光学显微镜和透射电镜等测试手段对复合材料的力学性能和显微组织进行了表征。6次ARB循环后，复合材料的屈服强度、抗拉强度和伸长率分别为213 MPa、266 MPa和21.6%。与铸态和轧制态相比，复合材料的屈服强度和抗拉强度分别提高了142.04%和82.05%，79.72%和60.24%。获得了189 kNm/kg的最高比强度。复合材料的最高显微硬度值为84.6HV，比铸态（50.7HV）和轧制态（56.5HV）分别提高了66.86%和49.73%。在Mg-14 Li-1Al/MWCNTs复合材料中观察到高密度位错、超细晶粒和均匀分散的碳纳米管。复合材料的强化主要是细晶强化和位错强化。
Mg-14Li-1Al/MWCNTs composites were prepared by electrophoretic deposition and accumulative roll bonding (ARB). The mechanical properties and microstructure was characterized by tensile test, microhardness, optical microscope and transmission electron microscope. After 6 cycles of ARB, the yield strength, ultimate tensile strength and elongation of the composite are 213 MPa, 266 MPa and 21.6%, respectively. Compared with the as-cast alloy and as-rolled alloy, the yield strength and ultimate tensile strength of the composite were increased by 142.04% and 82.05%, 79.72% and 60.24%, respectively. A highest specific strength of 189 kNm/kg was obtained. The highest microhardness value of the composite is 84.6 HV, which is 66.86% and 49.73% higher than that of the as-cast (50.7 HV) and as-rolled (56.5 HV) alloys. High density dislocations, ultrafine grains, and carbon nanotubes with uniform dispersion were observed in the Mg-14Li-1Al/MWCNTs composites. The strengthening of the composites is mainly contributed to fine grain strengthening and dislocation strengthening.
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