ABSTRACT

Grain-growth kinetics of high-entropy, single-phase, face-centred cubic (FCC) Al_0.2CoCrFeNi alloy was studied by isothermal annealing over a wide temperature range for different time intervals. Both optical and EBSD studies show a significant amount of annealing twins. Data were analysed using classical grain-growth models and the activation energy was estimated using the Arrhenius type equation. The grain-growth exponent was found to be n = 3 and the measured activation energy for grain growth was 190 ± 15 kJ mol⁻¹. Significant resistance to grain growth was observed at 1100°C. Microstructural characterisation tools like EBSD, along with nanoindentation, was used to understand the observed behaviour.

摘要

高熵、单相、面心立方 (FCC) Al _0.2 CoCrFeNi 合金的晶粒生长动力学通过在不同时间间隔的宽温度范围内等温退火进行研究。光学和 EBSD 研究都显示出大量的退火孪晶。使用经典的晶粒生长模型分析数据，并使用 Arrhenius 型方程估计活化能。发现晶粒生长指数为n  = 3，测量的晶粒生长活化能为 190 ± 15 kJ mol ^-1。在 1100°C 观察到显着的晶粒生长阻力。使用像 EBSD 这样的微观结构表征工具以及纳米压痕来理解观察到的行为。