材料科学
合金
中子散射
小角中子散射
小角度散射
凝聚态物理
中子
热力学
散射
冶金
核物理学
光学
物理
作者
Xuelian Wu,Bing Wang,Christine Rehm,Haiyan He,Muhammad Naeem,Si Lan,Zhenduo Wu,Xun-Li Wang
出处
期刊:Acta Materialia
[Elsevier]
日期:2022-01-01
卷期号:222: 117446-117446
被引量:14
标识
DOI:10.1016/j.actamat.2021.117446
摘要
Phase evolution of CoCrFeNiMo 0.3 high entropy alloy (HEA) under different annealing temperatures was investigated by means of ultra-small-angle neutron scattering (USANS), X-ray diffraction (XRD), and scanning electron microscopy (SEM). For the as-cast CoCrFeNiMo 0.3 alloy, a dendritic structure consisting of mainly face-centered cubic (FCC) solid solution matrix and small amount of micro-sized σ precipitates was observed. Upon isothermal annealing, secondary phase precipitation occurred and precipitates with two size ranges (i.e., microscale and nanoscale) generated in the alloy. These precipitates were identified as newly formed μ and σ phases. Specifically, the size distribution of the nanoscale μ precipitates was determined by USANS measurements. It was found that the size of the nanoscale precipitates increased with the annealing temperature, jumping from 72 nm at 750 °C to 258 nm at 800 °C, which contributed to the sharp drop in hardness of the alloy. The present alloy maintained high hardness within a wide temperature range of 550–750 °C, which makes it a promising material for structural applications at intermediate temperatures.
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