Research on cold spray-friction stir processing composite additive manufacturing of CoCrFeNi/6061Al composites and influence law of reinforcement phase
CoCrFeNi high-entropy alloy particles were used as reinforcing phases to replace the traditional ceramic particles,and CoCrFe-Ni/6061Al composites were prepared by cold spray-friction stir processing composites additive manufacturing technology.The microstruc-ture of composites additive was characterized by SEM,EBSD,TEM and XRD detection techniques.The effects of different volume frac-tions of CoCrFeNi particles on the microstructure and mechanical properties of the composites were studied.The results show that cold spray-friction stir processing composites additive manufacturing eliminates a large number of micropores and microcracks generated by cold spray and realizes the additive manufacturing of uniform and dense CoCrFeNi/6061 Al composites.The addition of CoCrFeNi particles sig-nificantly refines the grains of the composites additive.Intermetallic compounds generated by the interfacial reaction between CoCrFeNi particles and Al matrix are mechanically broken into nano-particles and disperse into Al matrix.With the increase of the volume fraction of CoCrFeNi particles,the ultimate tensile strength and average microhardness of the composites additive are significantly enhanced.
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