本发明属于高熵合金技术领域,公开一种基于高梯度定向凝固的异构共晶高熵合金及其制备方法,所述制备方法为：采用电火花线切割技术,对铸造态共晶高熵合金板材进行切割处理,获得合金棒,电解抛光处理后,置于液态金属冷却法高真空定向凝固设备中,抽真空至真空度≤1.5×10～(-3)Pa,通入氩气,加热至1450～1550℃后进行保温；然后在温度梯度为400K/cm,以100～800μm/s的抽拉速率进行抽拉,当抽拉距离≥80mm时,利用气缸将合金棒快速淬入装有冷却介质的结晶器中进行冷却处理,获得异构共晶高熵合金。本发明的制备方法工艺简单,操作方便,制备出的合金力学性能优异,适于推广和应用。

The invention belongs to the technical field of high entropy alloy, and discloses an isomeric eutectic high entropy alloy based on high gradient directional solidification and a preparation method thereof. The preparation method is: The cast eutectic high-entropy alloy sheet was cut by electric discharge wire cutting technology to obtain alloy rods. After electrolytic polishing, the alloy bars were placed in liquid metal cooling high vacuum directional solidification equipment, vacuumed to a vacuum degree of ≤1.5×10 ~ (-3)Pa, argon was injected, and heated to 1450 ~ 1550℃ for heat preservation. Then, when the temperature gradient is 400K/cm, the drawing rate is 100 ~ 800μm/s. When the drawing distance is ≥80mm, the cylinder is used to quickly quench the alloy rod into the crystallizer equipped with cooling medium for cooling treatment, and the isomeric eutectic high-entropy alloy is obtained. The preparation method of the invention has the advantages of simple process, convenient operation, excellent mechanical properties of the prepared alloy, and is suitable for popularization and application.