【摘要】：采用按需噴射方法制備不同粒徑的Cu-6%Sn合金粉末,測量不同粒徑條件下的二次枝晶間距,并且推導(dǎo)出半經(jīng)驗(yàn)公式,建立二次枝晶間距與液滴冷卻速率之間的數(shù)學(xué)關(guān)系,并利用光學(xué)顯微鏡和背散射電子顯微鏡觀察液滴組織形貌。結(jié)果表明:枝晶特征取決于凝固速率、冷卻介質(zhì)以及飛行距離;液滴溫度處于液相線與固相線之間,當(dāng)液滴彼此發(fā)生碰撞時(shí),由于碰撞引起熱傳導(dǎo)率提高,經(jīng)過數(shù)學(xué)模型推導(dǎo),發(fā)生碰撞的液滴冷卻速率超過4×10~4 K/s,枝晶組織和晶粒明顯細(xì)化。由于液滴內(nèi)部溫度梯度作用,枝晶沿碰撞方向生長。
[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.
【作者單位】： 西南交通大學(xué)材料科學(xué)與工程學(xué)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
【分類號】：TF123.71

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