合金
固溶体
各向同性
材料科学
组态熵
原子半径
缩放比例
高熵合金
热力学
熵(时间箭头)
晶格常数
衍射
冶金
化学
数学
物理
几何学
光学
有机化学
作者
Norihiko L. Okamoto,Koretaka Yuge,Katsushi Tanaka,Haruyuki Inui,E.P. George
出处
期刊:AIP Advances
[American Institute of Physics]
日期:2016-12-01
卷期号:6 (12)
被引量:242
摘要
Although metals strengthened by alloying have been used for millennia, models to quantify solid solution strengthening (SSS) were first proposed scarcely seventy years ago. Early models could predict the strengths of only simple alloys such as dilute binaries and not those of compositionally complex alloys because of the difficulty of calculating dislocation-solute interaction energies. Recently, models and theories of SSS have been proposed to tackle complex high-entropy alloys (HEAs). Here we show that the strength at 0 K of a prototypical HEA, CrMnFeCoNi, can be scaled and predicted using the root-mean-square atomic displacement, which can be deduced from X-ray diffraction and first-principles calculations as the isotropic atomic displacement parameter, that is, the average displacements of the constituent atoms from regular lattice positions. We show that our approach can be applied successfully to rationalize SSS in FeCoNi, MnFeCoNi, MnCoNi, MnFeNi, CrCoNi, CrFeCoNi, and CrMnCoNi, which are all medium-entropy subsets of the CrMnFeCoNi HEA.
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