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Preparation and characterization of different surface modified SiCp reinforced Al-matrix composites

表面改性SiC 颗粒增强Al 基复合材料的制备与表征

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Abstract

The effects of SiCp surface modifications (Cu coating, Ni coating and Ni/Cu coating) on the microstructures and mechanical properties of Al matrix composites were investigated. Surface modification of SiC particles with Cu, Ni and Cu/Ni, respectively, was carried out by electroless plating method. SiCp/Al composites were prepared by hot pressed sintering followed by hot extrusion. The results show that the surface modification of SiC particles plays an effective role, which is relative to the type of surface coating, and the interfacial bonding become stronger in the following order: untreated SiCp<Ni(Cu)-coated SiCp<Ni/Cu-coated SiCp. The Ni/Cu-coated SiCp/Al composites exhibit the best comprehensive mechanical properties, with ultimate tensile strength (σUTS) and fracture strain (εf) of 389 MPa and 6.3%, respectively. Compared with that of untreated-SiCp/Al composites, the σUTS and εf are enhanced by 19.3% and 57.5%.

摘要

本文研究了SiCp 表面改性(Cu 涂层、Ni 涂层和Ni/Cu 涂层)对Al 基复合材料组织和力学性能的 影响。采用化学镀方法对SiC 颗粒分别进行了Cu、Ni 和Cu/Ni 涂层表面改性。采用热压烧结、热挤 压法制备了SiCp/Al 复合材料, 并用扫描电镜(SEM)、能谱仪(EDS)、电子探针(EPMA)和X 射线衍射 仪(XRD)对其进行了表征。结果表明, SiC 颗粒的表面改性与表面涂层类型有关, 其界面结合强度依 次为:未处理SiCp<Ni(Cu)涂层SiCp<Ni/Cu 涂层SiCp。Ni/Cu 涂层SiCp/Al 复合材料综合力学性能最 好, 其极限拉伸强度(σUTS)为389 MPa, 断裂应变(εf)为6.3%。与未处理SiCp/Al 复合材料相比, σUTS 和εf 分别提高了19.3%和57.5%。

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Correspondence to Xiao-feng Wang  (王小锋).

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Project(2017zzts111) supported by the Fundamental Research Funds for the Central Universities, China

Contributors

WANG Xiao-feng and DONG Cui-ge have made substantial contributions to the conception or design of the work. LÜ Pin-hui conducted the literature review and wrote the first draft of the manuscript. PENG Chao-qun and WANG Ri-chu revised it critically for important intellectual content.

Conflict of interest

LÜ Pin-hui, WANG Xiao-feng, DONG Cui-ge, PENG Chao-qun and WANG Ri-chu declare that they have no conflict of interest.

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Lü, Ph., Wang, Xf., Dong, Cg. et al. Preparation and characterization of different surface modified SiCp reinforced Al-matrix composites. J. Cent. South Univ. 27, 2567–2577 (2020). https://doi.org/10.1007/s11771-020-4482-z

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