High-entropy alloy (HEA) is an emerging alloy which consists of five or more metallic elements with equimolar concentrations and exhibits excellent mechanical properties at cryogenic temperature. However, its machinability is almost unknown. In this study, high frequency one-dimensional ultrasonic vibration-assisted diamond turning (UVDT) experiments were conducted on an FeCrCoMnNi-based HEA to investigate the micro-nanoscale material removal mechanisms. Compared with conventional diamond turning, UVDT produced thinner chips, lower cutting forces, less tool wear and better surface integrity. Due to the ultrasonic vibration-assisted burnishing effect, surface scratches were significantly eliminated. A freeform surface was test-fabricated with optical-level finish.

高熵合金（HEA）是一种新兴的合金，由五种或多种等摩尔浓度的金属元素组成，在低温下表现出优异的机械性能。然而，它的可加工性几乎是未知的。在这项研究中，在 FeCrCoMnNi 基 HEA 上进行了高频一维超声振动辅助金刚石车削 (UVDT) 实验，以研究微纳米级材料去除机制。与传统的金刚石车削相比，UVDT 产生更薄的切屑、更低的切削力、更少的刀具磨损和更好的表面完整性。由于超声波振动辅助抛光效果，表面划痕明显消除。自由曲面经过测试制造，具有光学级表面处理。