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CuAgZr alloy is known for its high strength and high conductivity, which are reasons for its wide application. In this work, CuAgZr powder alloys were produced by high-pressure argon gas atomisation. The results indicate that the surface morphology of the powder is a cellular crystal structure with a pentagonal crystal structure, with a 'rose-like' lattice and cross-shaped dendrites. A three-dimensional model of the primary dendritic changes in the CuAgZr alloy powder with different powder diameters was established by studying the surface morphology and internal microstructure of the powder. The relationship between the powder diameter and the powder cooling rate was established as the function of the primary dendritic length (PDL), the primary dendritic volume fraction (PDVF), the secondary dendrite arm spacing (SDAS) and the secondary dendritic volume fraction (SDVF). A confidence validation was performed, and the function fitting error is within 10%. The results establish that the function is meaningful.

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