退火温度对纳米晶FeCoNi中熵合金微观组织的影响

doi:10.13251/j.issn.0254-6051.2026.02.037

摘要/Abstract

摘要： 利用电沉积法制备出了等原子比的纳米晶FeCoNi中熵合金,对其进行200~700 ℃的退火处理,利用X射线衍射仪、透射电镜、扫描电镜等对退火后的微观组织结构进行了表征。结果表明,在200~500 ℃进行退火处理时,随着退火温度的升高,中熵合金发生了面心立方-体心立方的相转变,当退火温度升高至600 ℃和700 ℃时,体心立方相消失。粗晶FeCoNi中熵合金在不同温度退火后均未发生相变。纳米晶FeCoNi合金的相变过程受扩散控制,大量的晶界及晶界附近的位错为元素扩散提供了通道,有利于体心立方相的形核。

关键词: 纳米晶, 中熵合金, 组织演变, 扩散型相变

Abstract: Nanocrystalline FeCoNi medium-entropy alloy (MEA) was prepared by electrodeposition, and its microstructure after annealing at 200-700 ℃ was characterized by means of X-ray diffractometer, transmission electron microscope and scanning electron microscope. The results show that during annealing at 200-500 ℃, a phase transformation from face-center cubic to body-center cubic occurs in the tested alloy with the increase of annealing temperature, while the body centered cubic phase disappears after annealing at 600 ℃ and 700 ℃. No phase transformation occurs in coarse grain FeCoNi medium-entropy alloy annealed at different temperatures. The phase transformation process of the tested alloy is controlled by element diffusion; a large number of grain boundaries and dislocations near grain boundaries provide channels for element diffusion, which is beneficial for the nucleation of body centered cubic phases.

Key words: nanocrystalline, medium-entropy alloy, microstructure evolution, diffusional phase transformation

中图分类号:

TG139

陈岩, 李斯恩, 韩双. 退火温度对纳米晶FeCoNi中熵合金微观组织的影响[J]. 金属热处理, 2026, 51(2): 250-256.

Chen Yan, Li Sien, Han Shuang. Effect of annealing temperature on microstructure of nanocrystalline FeCoNi medium-entropy alloy[J]. Heat Treatment of Metals, 2026, 51(2): 250-256.

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