High strength and high ductility nano-Ni-Al2O3/A356 composites fabricated with nickel-plating and equal channel angle semi-solid extrusion (ECASE)
High strength and high ductility nano-Ni-Al2O3/A356 composites fabricated with nickel-plating and equal channel angle semi-solid extrusion (ECASE)
复制标题
镀镍等通道角半固态挤压（ECASE）制备高强高塑纳米Ni-Al2O3/A356复合材料
DOI：
10.1016/j.jmrt.2021.05.083
复制
发表时间：
2021-06-15
影响因子：
6.4
通讯作者：
Ran, Songjiang
中科院分区：
文献类型：
--
作者：
Wang, Tan;Zuo, Xiaoqing;Ran, Songjiang
采用镀镍、搅拌铸造和等通道角半固态挤压（ECASE）工艺制备了Ni-Al_2 O_3/A356纳米复合材料。研究了复合材料的显微组织、拉伸性能和断口形貌。显微组织观察表明，镀镍层能促进形核，打破纳米颗粒的团聚，使基体晶粒尺寸减小（63 μ m），纳米颗粒分布均匀。ECASE可以进一步细化晶粒尺寸（23 μ m）并改善纳米颗粒分散。虽然5道次可以将颗粒细化到16 μ m，但由于纳米颗粒长期存在于半固液相中，会导致颗粒重新团聚。所制备的纳米复合材料的强度和塑性都有提高，约为相应的铝基复合材料的1.2-2.5倍。由于Orowan强化和细晶粒强化，即，增加了晶界的数量并改善了颗粒对协同晶粒变形的抵抗力。同时，ECASE消除了晶界缺陷，改善了晶界结合。纳米复合材料的力学性能的提高归因于镀镍和ECASE增加的晶界控制。晶界控制，如增加晶界数量、改善颗粒与基体的粘附性和颗粒的分散性，可应用于高力学性能铝基复合材料的开发。(C)2021年，任作家。由爱思唯尔公司出版
The nano-Ni-Al2O3/A356 nanocomposites prepared with nickel-plating, stir casting, and equal channel angle semi-solid extrusion (ECASE). The microstructure, tensile property, and fracture morphology of the fabricated nanocomposites have been investigated. The microstructure observation showed the nickel-plating could stimulate nucleation and break nanoparticle aggregation, resulting the matrix grains in a smaller size (63 mu m) and the nanoparticles more uniform located on the grain boundary. The ECASE could further refine the grains size (23 mu m) and improve the nanoparticle dispersion. Although 5 passes refine the grains to 16 mu m, it would cause the particles to re-agglomerate, due to the nanoparticles exist in the semi-solid liquid phase for a long time. The fabricated nanocomposites exhibited an enhancement in both strength and ductility, about 1.2-2.5 times higher than those of the corresponding aluminum matrix composites. Due to the Orowan strengthening and fine grain strengthening, i.e., increased the number of grain boundaries and improved the resistance of particles to cooperative grain deformation. Meanwhile, the ECASE eliminated the intergranular defects and improved the grain boundary bonding. The enhanced mechanical properties of the nanocomposites were attributed to the grain boundary control increased by the nickel-plating and ECASE. The grain boundary control, such as increasing the grain boundary number, improving the particle-matrix adhesion and particle dispersion, can be applied to the development of high mechanical properties aluminum matrix composites. (C) 2021 The Authors. Published by Elsevier B.V.