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monicajing

铜虫 (小有名气)

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专业: 金属非晶态、准晶和纳米晶

[交流] 物理所汪老师最新APL文章

Appl. Phys. Lett. 94, 121904 (2009)

Correlations between elastic moduli and molar volume in metallic glasses

J. Q. Wang, W. H. Wang, H. B. Yu, and H. Y. Bai
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China

We report clear correlations between bulk modulus (K) and average molar volume Vm, and between Poisson's ratio and Vm for various bulk metallic glasses. The origin for the correlations between elastic moduli and Vm are discussed. The established correlation, associated with Poisson's ratio , and since the correlates with plasticity of metallic glasses, indicates that the average molar volume is important factor to be considered for plastic metallic glasses searching. The found correlations also suggest a close relation between the mechanical properties and the short-range atomic bonding, and assist in understanding deformation behavior in metallic glasses. ©2009 American Institute of Physics

[ Last edited by hslining on 2009-9-21 at 23:24 ]

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monicajing

铜虫 (小有名气)

应助: 0 (幼儿园)
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专业: 金属非晶态、准晶和纳米晶

Appl. Phys. Lett. 另一篇最新文献

Appl. Phys. Lett. 94, 112507 (2009)

Weak exchange effect and large refrigerant capacity in a bulk metallic glass Gd0.32Tb0.26Co0.20Al0.22

Yongsheng Liu,1 Jincang Zhang,2 Youquan Wang,3 Yanyan Zhu,1 Zhenglong Yang,4 Jing Chen,1 and Shixun Cao2
1Department of Mathematics and Physics, Shanghai University of Electric Power, Shanghai 200090, People's Republic of China
2Department of Physics, Shanghai University, Shanghai 200444, People's Republic of China
3Department of Materials Science and Engineering, Shanghai University, Shanghai 200072, People's Republic of China
4Institute of Functional Polymer Materials, Tongji University, Shanghai 200092, People's Republic of China

The magnetic behavior and refrigeration capacity of Gd0.32Tb0.26Co0.20Al0.22, a bulk metallic glass (BMG) fabricated by a copper-mold suck-casting method, are investigated. The Curie temperature increases from 79 K at 200 Oe to 95 K at 50 000 Oe. A weak exchange field of 25 T in the BMG system, caused by the strong disorder, is derived by the mean-field approximation. The maximum magnetic entropy change (8.02 J kg−1 K−1) and the refrigerant capacity (642 J kg−1) for 5 T indicate the BMG has the better refrigerant efficiency compared to known magnetic refrigerants. ©2009 American Institute of Physics