Fe_(78)Si_9B_(13)非晶合金的高温变形性能

通过高温拉伸及胀形实验,研究了Fe78Si9B13非晶合金的塑性变形性能。高温拉伸的温度范围为430℃~530℃,初始应变速率为1.67×10-4s-1~1.67×10-3s-1。利用X射线衍射(XRD)和扫描电镜(SEM)对高温变形后的微观组织进行了分析。高温拉伸的延伸率随温度的升高先增大后减小,450℃时达到最大;在450℃,初始应变速率为8.33×10-4s-1时延伸率为40%。在450℃胀形得到半径为5mm、高4mm的近半球试件,显示了Fe78Si9B13非晶合金具有良好的高温变形性能。高温塑性变形过程中伴随着非晶的晶化,使塑性流动应力增大,影响了Fe78Si9B13非晶合金的高温变形性能。

Deformation property of amorphous Fe78Si9B13 alloy at elevated temperature

The plastic deformation property of amorphous Fe78Si9B13 alloy was investigated by tension and gas pressure bulging at elevated temperature.Tensile tests were performed in the temperature range of 430℃～530℃ and initial strain rate range of 1.67×10-4s-1～1.67×10-3s-1.The microstructure of deformed specimens was studied by means of XRD and SEM.The elongation initially increases and then decreases with temperature.The maximum elongation of 40% is obtained at 450℃ with an initial strain rate of 8.33×10-4s-1.The radius and height of near-hemisphere part bulging at 450℃ are 5mm and 4mm respectively.This indicates amorphous Fe78Si9B13 alloy has good high-temperature deformation properties.The crystallization of amorphous alloy occurs in the plastic deformation process at elevated temperature,which leads to the increase of plastic flow stress and affects high-temperature deformation properties of amorphous Fe78Si9B13 alloy.