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对Cu-10%Co-10%Fe(质量分数)亚稳液态组元不混溶合金开展了气体雾化快速凝固实验,制备了富Fe-Co相球形粒子均匀分布于基体Cu的复合粉末,建立了Cu-Co-Fe合金雾化液滴冷却过程中的温度场、浓度场和液-液相变动力学控制方程,研发了耦合合金热力学和相变动力学的模拟方法,模拟分析了Cu-10%Co-10%Fe合金雾化液滴的凝固组织形成过程.实验和模拟结果表明,在气体雾化快速凝固条件下,液-液相变过程中富Fe-Co相液滴Marangoni迁移和Ostwald熟化的影响很弱,粉末中心绝大部分区域内富Fe-Co相粒子的空间分布均匀.对于直径小于220 mm的Cu-10%Co-10%Fe合金粉末,富Fe-Co相粒子的平均半径Ra和数量密度N与雾化粉末直径d之间符合指数关系.
Gas-atomized rapid solidification experiments were carried out on the Cu-10% Co-10% Fe (mass fraction) metastable liquid element immiscible alloy, and the composite powder with Fe-Co rich spherical particles uniformly distributed on the matrix Cu was prepared. The governing equations of temperature field, concentration field and liquid-liquid phase change in the atomization droplet of Cu-Co-Fe alloy were set up. The simulation method of the thermodynamics and phase transition kinetics of the coupled alloy was developed. The Cu-10 % Co-10% Fe alloy atomized droplets.The experimental and simulation results show that the Marangoni migration and Ostwald ripening of the Fe-Co rich phase droplets during the liquid-solid phase transition process under gas atomization rapid solidification , The spatial distribution of Fe-Co-rich particles is very uniform in most of the powder center.For Cu-10% Co-10% Fe alloy powder with diameter less than 220 mm, the average radius of Fe-Co rich particles Exponential relationship exists between Ra and the number density N and atomized powder diameter d.