La-based bulk metallic glasses with critical diameter up to 30 mm

被引：123
作者：
Jiang, Q. K.
Zhang, G. Q.
Yang, L.
Wang, X. D.
Saksl, K.
Franz, H.
Wunderlich, R.
Fecht, H.
Jiang, J. Z. [1 ]
机构：
[1] Zhejiang Univ, ICNSM, Hangzhou 310027, Peoples R China
[2] Zhejiang Univ, Lab New Struct Mat, Dept Mat Sci & Engn, Hangzhou 310027, Peoples R China
[3] HASYLAB & DESY, D-22603 Hamburg, Germany
[4] Univ Ulm, Fac Engn, Dept Mat, D-89081 Ulm, Germany
[5] Forschungszentrum Karlsruhe, Inst Nanotechnol, Karlsruhe, Germany
来源：
ACTA MATERIALIA | 2007年 / 55卷 / 13期
基金：
中国国家自然科学基金;
关键词：
glass forming ability; bulk metallic glass; water quenching; thermodynamics; structure;
D O I：
10.1016/j.actamat.2007.04.021
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report composition optimization, thermal and physical properties of new La-based bulk metallic glasses with high glass forming ability (GFA) based on a ternary La62Al14Cu24 alloy. By refining the (Cu, Ag)/(Ni, Co) and La/(Cu, Ag) ratios in the La-Al-(Cu,Ag)-(Ni, Co) pseudo-quaternary alloy, the formation of 30 mm diameter of La65Al14(Cu5/6Ag1/6)(11)(Ni1/2Co1/2)(10) bulk metallic glass (BMG) alloy is achieved using water quenching. The origin of the high GFA was investigated from the kinetic, structural and thermodynamic points of view, and was found to be due to the smaller difference in Gibbs free-energy between the amorphous and crystalline phases in the pseudo-quaternary alloy. These alloys exhibit low glass transition temperatures, below 430 K, and relatively wide supercooled liquid regions of 40-60 K. Mechanical tests on these alloys show a fracture strength of 650 GPa, Vicker's hardness 200 kg mm(-2), Young's modulus 35 GPa, shear modulus 13 GPa and Poisson ratio 0.356. The La-based BMGs are useful for both scientific and engineering applications. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：4409 / 4418
页数：10
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