The incredible excess entropy in high entropy alloys

被引：28
|
作者：
Wang, Jianbin [1 ]
Li, Junjie [1 ]
Wang, Qing [2 ]
Wang, Jincheng [1 ]
Wang, Zhijun [1 ]
Liu, C. T. [3 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
[2] Shanghai Univ, Inst Mat, Lab Microstruct, Shanghai 200072, Peoples R China
[3] City Univ Hong Kong, Coll Sci & Engn, Dept Mech & Biomed Engn, Ctr Adv Struct Mat,Kowloon, Hong Kong, Peoples R China
来源：
SCRIPTA MATERIALIA | 2019年 / 168卷
基金：
中国国家自然科学基金;
关键词：
Excess entropy; High entropy alloys; Magnetic entropy; Heat capacity; HEAT-CAPACITY; DESIGN;
D O I：
10.1016/j.scriptamat.2019.04.013
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The increased excess entropy in face-centered-cubic high entropy alloys is confirmed by quantitatively measuring heat capacities of pure Ni together with equiatomic NiCo, NiCoCr, and NiCoFeCr alloys with increasing configurational entropy. Surprisingly, the incredible excess entropy in the NiCoFeCr alloy can be even up to 0.9R, much larger than that in traditional alloys. The temperature-dependent measurement of the excess entropy indicates the major contribution of lattice vibrations. The excess magnetic entropy dominates in the temperature of 300 to 1000 K. The abnormal excess entropy reveals extraordinary lattice dynamic effects in high entropy alloys, which is a new feature in these alloys. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：19 / 22
页数：4
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