Cooling rate calculation and microstructure evolution of Sm-Fe alloy powder prepared by high pressure gas atomization

Abstract

The Sm2Fe17 alloy powder was prepared by high-pressure gas atomization technology, and its morphology and size distribution were analyzed. The relationship between the micro-structure evolution of the Sm-Fe alloy powder and the cooling rate was calculated. Besides, the relationship between the cooling rate of the high-pressure aerosolized alloy powder and the change of secondary dendrite arm spacing (SDAS) was verified. The cooling rate of the powder was indirectly determined according to the empirical relationship between the dendritic spacing of the rapidly solidified alloy and the cooling rate. After comparison, the results are consistent with the theoretical calculation.

Keywords

• Sm-Fe alloy
• powder prepared
• cooling rate
• SDAS
• particle size
• microstructure