Fatigue endurance limit and crack growth behavior of a high-toughness Zr61Ti2Cu25Al12 bulk metallic glass

IMR OpenIR

	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
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	99 页码:165-175
摘要	We 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.
部门归属	[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
关键词	Metallic Glasses Fatigue Crack Propagation Fracture Zirconium Alloys
资助者	National Natural Science Foundation of China [51171180]; JHU by U.S.-DOE-BES, Division of Materials Sciences and Engineering [DE-FG02-09ER46056]
收录类别	sci
语种	英语
WOS记录号	WOS:000362145400018
引用统计	被引频次：50[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/74851
专题	中国科学院金属研究所
通讯作者	jianxu@imr.ac.cn
推荐引用方式 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.