亚稳态
材料科学
退火(玻璃)
顺磁性
合金
铁磁性
居里温度
热力学
电负性
高熵合金
焓
混合焓
固溶体
凝聚态物理
冶金
化学
物理
有机化学
作者
Lucía Santiago‐Andrades,A. Vidal-Crespo,J.S. Blázquez,J.J. Ipus,C.F. Conde
出处
期刊:Nanomaterials
[Multidisciplinary Digital Publishing Institute]
日期:2023-12-21
卷期号:14 (1): 27-27
被引量:3
摘要
Various stability criteria developed for high-entropy alloys are applied to compositions produced by mechanical alloying. While they agree with the annealed samples, these criteria fail to describe the as-milled metastable systems, highlighting the ability of mechanical alloying to overcome the limitations imposed by these criteria. The criteria are based on atomic size (Ω ≥ 1.1 and δr ≤ 6.6%) and/or electronegativity misfit, as well as on mixing enthalpy (Λ>0.95 J mol−1K−1 and −5 kJ mol−1<∆Hmix<0), or purely thermodynamic (ϕYe>20; ϕKing>1; Teff<500 K). These criteria are applied to several compositions found in the literature and to two metastable fcc solid solutions produced by mechanical alloying with compositions Al0.75CoXFeNi with X = Cr and Mn. Single-phase microstructures are stable up to above 600 K, leading to more stable multiphase systems after annealing above this temperature. Mössbauer spectrometry shows that, whereas the alloy with Cr is paramagnetic in the as-milled and annealed state, the alloy with Mn changes from paramagnetic to ferromagnetic behavior (Curie temperature ~700 K) after annealing. Thermomagnetic experiments on annealed samples show for both compositions some hysteretic events at high temperatures (850 to 1000 K), probably ascribed to reversible ordering phenomena.
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