Effect of crystallization on the mechanical properties of Zr56.7CU15.3Ni12.5Nb5.0Al10.0Y0.5bulk amorphous alloy

被引:18
作者
Das, K
Bandyopadhyay, A [1 ]
Gupta, YM
机构
[1] Washington State Univ, Inst Shock Phys, Mat Sci Program, Pullman, WA 99164 USA
[2] Washington State Univ, Inst Shock Phys, Sch Mech & Mat Engn, Pullman, WA 99164 USA
[3] Washington State Univ, Inst Shock Phys, Dept Phys, Pullman, WA 99164 USA
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2005年 / 394卷 / 1-2期
关键词
bulk amorphous alloys; mechanical properties; crystallization behavior; phase transformation;
D O I
10.1016/j.msea.2004.11.045
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Effects of crystallization behavior on the mechanical properties of Zr56.7Cu15.3Ni12.5Nb5.0Al10.0Y0.5 based bulk amorphous alloy (BAA) were studied. Differential scanning calorimetry (DSC) in Ar environment showed three-exothermic peaks at 395, 472 and 659.5 degrees C and one-endothermic peak at 852 degrees C. Following DSC study, as received BAA samples were heat-treated in vacuum at six different temperatures 300, 450, 600, 700, 800 and 850 degrees C. Heat-treated samples were characterized using Vickers microhardness, X-ray diffraction (XRD), differential scanning calorimetry and field emission scanning electron microscopy (FESEM) to study crystallization behavior. It is found that samples heat-treated above the second (472 degrees C) and third (659.5 degrees C) exothermic peaks show high microhardness values compared to the as processed samples, and brittle cracking along the indent diagonal. As processed samples show clear evidence of shear banding. FESEM examination revealed existence of nano-scale precipitates for samples heat-treated at 600 and 700 degrees C, while micro-scale precipitates for 850 degrees C samples. Quasi-static compression tests showed compressive strain to failure decrease with heat-treated samples compared to as received ones. Fracture morphology of the compression test samples changes from vein pattern for as received to flat facets with multiple cracks for heat-treated samples. Indentation fracture toughness values decrease almost an order of magnitude for heat-treated samples compared to as received samples. (c) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:302 / 311
页数:10
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