Undercool-Rapid Quench Processing of Titanium Rare-Earth Alloys

一种新的材料加工系统被用来从过冷状态快速凝固液态金属。该设备将电磁悬浮和自由落体结合在落管中，并在超高真空环境下通过熔体旋压实现快速凝固。选择了一组钛/稀土合金进行研究，因为以前的研究表明，在深过冷条件下快速凝固后，组织有了显著的改善。实验方法包括三个阶段：(1)材料评价；(2)过冷和再辉模拟；(3)超快淬火处理，结合成块状样品。用扫描和透射电子显微镜对样品进行了表征。%这种欠冷-快速淬火处理系统可以扩大到商业化。这项研究应该能够评估该工艺对一系列钛合金的益处，并提供有关该工艺的科学信息。

A new materials processing system is used to rapidly solidify liquid metal from an undercooled state. This facility incorporates electromagnetic levitation and free fall in a drop tube with rapid solidification by melt spinning in an ultrahigh vacuum environment. A set of titanium/rare-earth alloys has been selected for study because previous research has demonstrated significant microstructural improvement after rapid solidification from a deep undercooled condition. The experimental method consists of three phases: (1) materials evaluation; (2) undercooling and recalescence modeling; and (3) ultra-rapid quench processing with consolidation into bulk samples. Scanning and transmission electron microscopy are used to characterize the samples. %%% This undercool-rapid quench processing system could be scaled up for commercialization. This research should permit the evaluation of the benefits of the process for a series of titanium alloys, as well as supplying scientific information on the process.