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Fatigue endurance limit and crack growth behavior of a high-toughness Zr61Ti2Cu25Al12 bulk metallic glass
Song, Zhen-Qiang; He, Qiang; Ma, Evan; Xu, Jian; jianxu@imr.ac.cn
2015
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume99Pages:165-175
AbstractWe report the fatigue damage behavior of a Zr61Ti2Cu25Al12 (ZT1) bulk metallic glass (BMG), which was known to have a record-high fracture toughness. The ZT1 exhibits the highest fatigue endurance limit among all BMGs, with a normalized fatigue limit of sigma(a) = 440 MPa (in four-point bending at a loading ratio of 0.1), or similar to 0.27 of its tensile strength. The crack-growth resistance in the stress/life tests arises from crack-tip plastic shielding due to prolific shear-banding, as well as deflected crack path following a "zig-zag" pattern. The relation between the range of stress intensity factor (Delta K) and the crack-growth rate (crack extension per cycle, da/dN) was also determined. ZT1 shows a fatigue threshold, Delta K-th, of 2.8 MPa root m, which appears to be related to the onset of shear band nucleation. Three distinct regimes of fatigue crack growth were observed, with different slopes in the da/dN-Delta K curve, attributable to different micromechanisms. In the Paris regime, each fatigue striation on fracture surface is generated by a number of loading cycles, rather than by a single loading cycle. In general, the Delta K-th of a BMG approximately scales with its fracture toughness. At different levels of Delta K, shear bands appear to play different roles, either facilitating or blunting the crack growth. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
description.department[song, zhen-qiang ; he, qiang ; 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
KeywordMetallic Glasses Fatigue Crack Propagation Fracture Zirconium Alloys
Funding OrganizationNational Natural Science Foundation of China [51171180]; JHU by U.S.-DOE-BES, Division of Materials Sciences and Engineering [DE-FG02-09ER46056]
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/74851
Collection中国科学院金属研究所
Corresponding Authorjianxu@imr.ac.cn
Recommended Citation
GB/T 7714
Song, Zhen-Qiang,He, Qiang,Ma, Evan,et al. Fatigue endurance limit and crack growth behavior of a high-toughness Zr61Ti2Cu25Al12 bulk metallic glass[J]. ACTA MATERIALIA,2015,99:165-175.
APA Song, Zhen-Qiang,He, Qiang,Ma, Evan,Xu, Jian,&jianxu@imr.ac.cn.(2015).Fatigue endurance limit and crack growth behavior of a high-toughness Zr61Ti2Cu25Al12 bulk metallic glass.ACTA MATERIALIA,99,165-175.
MLA Song, Zhen-Qiang,et al."Fatigue endurance limit and crack growth behavior of a high-toughness Zr61Ti2Cu25Al12 bulk metallic glass".ACTA MATERIALIA 99(2015):165-175.
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