按需喷射CuSn合金液滴的冷却速率及组织演变（英文）
发布时间：2018-09-01 08:19
【摘要】：采用按需喷射方法制备不同粒径的Cu-6%Sn合金粉末,测量不同粒径条件下的二次枝晶间距,并且推导出半经验公式,建立二次枝晶间距与液滴冷却速率之间的数学关系,并利用光学显微镜和背散射电子显微镜观察液滴组织形貌。结果表明:枝晶特征取决于凝固速率、冷却介质以及飞行距离;液滴温度处于液相线与固相线之间,当液滴彼此发生碰撞时,由于碰撞引起热传导率提高,经过数学模型推导,发生碰撞的液滴冷却速率超过4×10~4 K/s,枝晶组织和晶粒明显细化。由于液滴内部温度梯度作用,枝晶沿碰撞方向生长。
[Abstract]:Cu-6%Sn alloy powders with different particle sizes were prepared by on-demand spray method. The secondary dendrite spacing was measured under different particle size conditions. The semi-empirical formula was derived, and the mathematical relationship between secondary dendrite spacing and droplet cooling rate was established. The microstructure of droplets was observed by optical microscope and backscatter electron microscope. The results show that the dendrite characteristics depend on the solidification rate, the cooling medium and the flying distance, and the drop temperature is between the liquid line and the solid line. When the droplets collide with each other, the thermal conductivity increases due to the collision. When the cooling rate of the colliding droplets exceeds 4 脳 10 ~ (4) K / s, the dendrite structure and grain size are obviously refined. The dendrite grows along the collision direction due to the temperature gradient inside the droplet.
【作者单位】： 西南交通大学材料科学与工程学院;Foundation
【基金】：Project(51301143)supported by the National Natural Science Foundation of China Project(2014M560727)supported by the National Postdoctoral Foundation of China Project(2015GZ0228)supported by the Sichuan Province Science-Technology Support Plan,China Project(2682014CX001)supported by the Science and Technology Innovation Project of SWJTU University,China
【分类号】：TF123.71
[Abstract]:Cu-6%Sn alloy powders with different particle sizes were prepared by on-demand spray method. The secondary dendrite spacing was measured under different particle size conditions. The semi-empirical formula was derived, and the mathematical relationship between secondary dendrite spacing and droplet cooling rate was established. The microstructure of droplets was observed by optical microscope and backscatter electron microscope. The results show that the dendrite characteristics depend on the solidification rate, the cooling medium and the flying distance, and the drop temperature is between the liquid line and the solid line. When the droplets collide with each other, the thermal conductivity increases due to the collision. When the cooling rate of the colliding droplets exceeds 4 脳 10 ~ (4) K / s, the dendrite structure and grain size are obviously refined. The dendrite grows along the collision direction due to the temperature gradient inside the droplet.
【作者单位】： 西南交通大学材料科学与工程学院;Foundation
【基金】：Project(51301143)supported by the National Natural Science Foundation of China Project(2014M560727)supported by the National Postdoctoral Foundation of China Project(2015GZ0228)supported by the Sichuan Province Science-Technology Support Plan,China Project(2682014CX001)supported by the Science and Technology Innovation Project of SWJTU University,China
【分类号】：TF123.71
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