Anomalous elastic hardening in Fe-Co alloys at high temperature

被引：13

作者：

Zhang, Hualei ^{[1
,2
]}

Li, Xiaoqing ^{[2
]}

Schonecker, Stephan ^{[2
,3
]}

Jesperson, Henrik

Johansson, Borje ^{[2
,4
]}

Vitos, Levente ^{[2
,4
,5
]}

机构：

[1] Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Ctr Microstruct Sci, Xian 710054, Peoples R China

[2] Royal Inst Technol, Dept Mat Sci & Engn, SE-10044 Stockholm, Sweden

[3] Uddeholms AB, SE-68385 Hagfors, Sweden

[4] Uppsala Univ, Dept Phys & Astron, Div Mat Theory, SE-75120 Uppsala, Sweden

[5] Res Inst Solid State Phys & Opt, Wigner Res Ctr Phys, H-1525 Budapest, Hungary

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 18期

基金：

瑞典研究理事会; 欧洲研究理事会; 美国国家科学基金会;

关键词：

EXCHANGE INTERACTIONS; IRON; CONSTANTS; METALS; APPROXIMATION;

D O I：

10.1103/PhysRevB.89.184107

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The elastic moduli of Fe1-cCoc (c <= 0.2) alloys are found to decrease strongly with increasing temperature, but show very weak alloying effects for both low-temperature ferromagnetic and high-temperature paramagnetic states. For temperatures slightly below and around the Curie temperature of Fe, Co addition significantly increases the elastic moduli. The variation of the tetragonal shear elastic constant upon 20% Co addition increases from a small negative value to more than 135% as the temperature rises from 0 to 1200 K. The expected elastic softening in the case of Al doping is not confirmed. Both anomalous trends are ascribed to the interplay between intrinsic chemical effects, magnetism, and temperature.

引用

页数：5

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