摘要
临界冷却速度是表征非晶态合金非晶形成能力的一个重要参数,但是正确地测量和估算非晶态合金形成时的冷却速度却十分困难.结合热传导理论和凝固理论,单辊甩带过程的热传输可以用一维傅立叶热传导方程描述.通过对热传导方程的数学解析求解,具体计算了单辊甩带法制备镁基非晶薄带的冷却速度,得到了铜辊制备50μm厚镁薄带的自由侧在凝固结束时的冷却速度为5.84×106K/s,这与早期人们预测的单辊甩带法的冷却速度相当.
Critical cooling rate is a key parameter characterizing the formation ability of amorphism of (amorphous) alloys, but it is still difficult to measure and estimate it correctly. However, based on the heat transfer theory and liquid solidification theory, the heat transfer during the rapid solidification process of a ribbon prepared by melt spinning can be approximately modeled by one-dimensional heat conduction equation, so that the temperature distribution in the ribbon and the cooling rate of the ribbon can be determined by the integration of this equation. According to the integration function, when the molten liquid of a 50 μm thick magnesium ribbon on the free surface of melt spinning copper roller solidifies out, the calculated cooling rate of the ribbon is up to 5.84×10~6 K/s. This result is coincident very well with other estimation values reported before.
出处
《兰州理工大学学报》
CAS
北大核心
2004年第3期11-13,共3页
Journal of Lanzhou University of Technology
基金
甘肃省自然科学基金(ZS032 B25 018)
关键词
快速凝固法
非晶态合金
冷却速度
非晶薄带
rapid solidification method
amorphous alloy
cooling rate
amorphous ribbon
