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Elevating the fracture toughness of Cu49Hf42Al9 bulk metallic glass: Effects of cooling rate and frozen-in excess volume
Z. D. Zhu; E. Ma; J. Xu
2014
Source PublicationIntermetallics
ISSN0966-9795
Volume46Pages:164-172
AbstractA major challenge for the structural applications of bulk metallic glasses (BMGs) is to improve their fracture toughness. Here we demonstrate that by increasing the cooling rate during the casting of liquid Cu49Hf42Al9 into BMG, using a mixed argon and helium atmosphere, the notch toughness of the resultant BMG can be tripled relative to that obtained at slower cooling rates. The much elevated toughness is attributed to a ten-fold increase in the size of the plastic zone at crack tip, due to the proliferation of shear banding facilitated by enhanced propensity for shear transformations. The latter propensity is explained by the reduced shear modulus and microhardness, as well as increased enthalpy recovery, all of which are rooted in structural disorder as reflected by the lowered density and increased frozen-in excess volume. Such a structure-property correlation is systematically demonstrated by monitoring all these properties over a range of diameters of the as-cast BMG rods that correspond to cooling rate levels from 40 K/s to 10(3) K/s. (C) 2013 Elsevier Ltd. All rights reserved.
description.department[zhu, zhen-dong ; xu, jian] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [ma, evan] johns hopkins univ, dept mat sci & engn, baltimore, md 21218 usa. ; xu, j (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china. ; jianxu@imr.ac.cn
KeywordGlasses, Metallic Fracture Toughness Brittleness And Ductility Elastic Properties Ni-cu-be Structural Relaxation Plastic-deformation Residual-stresses Mechanical-behavior Supercooled Liquids Amorphous Alloy Transition Diffraction Hardness
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/72513
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Z. D. Zhu,E. Ma,J. Xu. Elevating the fracture toughness of Cu49Hf42Al9 bulk metallic glass: Effects of cooling rate and frozen-in excess volume[J]. Intermetallics,2014,46:164-172.
APA Z. D. Zhu,E. Ma,&J. Xu.(2014).Elevating the fracture toughness of Cu49Hf42Al9 bulk metallic glass: Effects of cooling rate and frozen-in excess volume.Intermetallics,46,164-172.
MLA Z. D. Zhu,et al."Elevating the fracture toughness of Cu49Hf42Al9 bulk metallic glass: Effects of cooling rate and frozen-in excess volume".Intermetallics 46(2014):164-172.
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