将商用射频感应发生器改装为计算机控制的真空与气体集成退火系统，用于活性金属晶粒生长
Retrofitting a commercial RF induction generator into a computer-controlled, vacuum and gas integrated annealing system for reactive-metal grain growth
- Brigham Young University（杨百翰大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究将商用射频感应发生器改装为计算机控制的真空退火系统，实现接近熔点的晶粒生长，并可直接进行EBSD表征，为实验室提供低成本方案。
AI中文摘要：
在接近金属熔点的温度下进行高温真空退火可驱动受控晶粒生长，但这通常需要昂贵的交钥匙真空感应炉。我们将一台裸商用射频（RF）感应发生器改装为通过LabVIEW实现计算机功率控制、双波长光学温度反馈以及带有惰性气体回填的高真空石英管腔室。一个机加工的石墨坩埚兼作感受器，即一种吸收射频的元件，用于加热其所包围的试样。唯一的要求是单调的模拟功率控制输入，因此该改装可在不同发生器之间转移。我们的参考构建使用一台6 kW固态发生器。令人惊讶的是，在此系统中退火的镍无需任何试样制备即可产生高质量电子背散射衍射（EBSD）花样。样品直接从炉子进入电子显微镜，无需研磨、抛光或蚀刻。EBSD图谱索引了数百个等轴晶粒，这些晶粒由深热蚀沟 delineated。一种改进的样品组件将该炉扩展到不与射频场耦合的陶瓷。它在2500°下45分钟内使氧化钇稳定氧化锆（YSZ）晶粒粗化，而传统箱式炉在1600°下需要228小时。对于固定配置，功率-温度校准在1200至1400°范围内呈线性（$R^2$ = 0.991）。在1200°下进行的八次12小时镍退火将其保温温度重现至1201.2 $\pm$ 1.3°，而在1325°下进行的40小时保温保持稳定。完整的设计文件、物料清单、控制软件和数据均可公开获取。这为实验室提供了一条经济实惠的途径，以实现接近熔点的退火，并可直接进行退火至EBSD表征。
英文摘要：
High-temperature vacuum annealing near a metal's melting point drives controlled grain growth, but it normally requires an expensive turn-key vacuum induction furnace. We retrofit a bare commercial radio frequency (RF) induction generator with computer power control through LabVIEW, dual-wavelength optical temperature feedback, and a high-vacuum quartz-tube chamber with inert-gas backfill. A machined graphite crucible doubles as a susceptor, an RF-absorbing element that heats the specimen it encloses. The only requirement is a monotonic analog power-control input, so the retrofit transfers between generators. Our reference build uses a 6 kW solid-state generator. Surprisingly, nickel annealed in this system produced high-quality electron backscatter diffraction (EBSD) patterns with zero specimen preparation. Samples went directly from the furnace to the electron microscope without grinding, polishing, or etching. The EBSD maps indexed hundreds of equiaxed grains delineated by deep thermal grooves. A modified sample assembly extends the furnace to ceramics that do not couple to the RF field. It coarsened yttria-stabilized zirconia (YSZ) grains in 45 min at 2500°, compared with 228h at 1600° in a conventional box furnace. For a fixed configuration, the power-temperature calibration is linear ($R^2$ = 0.991) from 1200 to 1400°. Eight 12h nickel anneals at 1200° reproduced their soak temperature to 1201.2 $\pm$ 1.3°, and 40h soaks at 1325° remained stable. Complete design files, a bill of materials, control software, and data are openly available. This gives laboratories an affordable route to near-melting-point annealing with direct anneal-to-EBSD characterization.
