摘要
利用气雾化法制备出FeCrMnCoNi高熵合金粉体,研究了雾化压力与试管孔径对于粉体粒径的影响。结果表明,随雾化压力的增加,粒径在100μm以下的粉体占比由57%增加到72%,平均粒径由82.6μm减小到44.2μm;随试管孔径的减小,直径在100μm以下的粉体占比由79%减少49%,平均粒径由40.3μm增加到103.9μm。液滴冷却速率计算表明,直径为10~200μm的液滴冷却速率在3.8×10^(4)~4.3×10^(6)K/s之间,快速冷却的小液滴易粘连到未完全冷却的大液滴表面,因此粉体粒径越大,表面粘连的卫星球越多。雾化得到的液滴越大,过冷度越小,粉体晶粒越大,树枝晶组织越清晰。冷却速率的降低,也导致粉体内部组织从胞状晶转变为胞状柱状混合晶,最后形成树枝晶。
The FeCrMnCoNi high-entropy alloy powders were fabricated by gas atomization method,and the influences of atomization pressure and test tube diameter on powder particle dimension were investigated.The results indicate that with the increase of the atomization pressure,the proportion of powders with particle dimension below 100μm is increased from 57%to 72%,and the mean particle dimension is decreased from 82.6μm to 44.2μm.As the pore diameter of the test tube decreases,the proportion of powders with a diameter less than 100μm is decreased from 79%to 49%,and the mean particle dimension is increased from 40.3μm to 103.9μm.The calculation for the cooling rate of droplets reveal that the cooling rate of droplets with a diameter of 10~200μm is between 3.8×10^(4)K/s and 4.3×10^(6)K/s,and the rapidly cooled droplets are prone to adhere to the surface of incompletely cooled large droplet.Therefore,the larger the particle dimension of the powder is,the more satellite spheres adhered on the surface is.The larger the droplets obtained by atomization is,the smaller the degree of subcooling is,the greater the powder crystal grains is,and the clearer the dendritic structure is.The decrease in cooling rate also leads to the transformation of internal structure of powder from cellular crystals to mixture of cellular and columnar crystals and then to form dendrites.
作者
崔小杰
苏新磊
刘岩
李月
赵定国
王书桓
张鹏杰
Cui Xiaojie;Su Xinlei;Liu Yan;Li Yue;Zhao Dingguo;Wang Shuhuan;Zhang Pengjie(College of Metallurgy and Energy,North China University of Science and Technology)
出处
《特种铸造及有色合金》
CAS
北大核心
2022年第4期441-445,共5页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(52074128)
河北省自然科学基金资助项目(E2020209014)
关键词
高熵合金
粉体
冷却速率
High-entropy Alloy
Powder
Cooling Rate
