Mechanical properties for bulk metallic glass with crystallites precipitation and second ductile phase addition

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	Mechanical properties for bulk metallic glass with crystallites precipitation and second ductile phase addition
	K. Q. Qiu ; D. Z. Hao ; Y. L. Ren ; H. Zhang
刊名	Journal of Materials Science
	2007
卷号	42 期号:9 页码:3223-3229
关键词	ni-cu-be fracture-toughness matrix composites amorphous-alloys behavior decomposition stability tungsten spheres
ISSN号	0022-2461
中文摘要	Monolithic phase bulk metallic glasses (BMGs) produced by a copper mold casting method and BMG composites containing in-situ brittle crystallites and out-situ tungsten fiber produced by a water quenching method were obtained. Mechanical properties including cyclic deformation and fracture toughness were investigated. Under symmetrically cyclic stress control, the life of tungsten fiber reinforced amorphous alloy is much longer than that of the monolithic amorphous alloy. The composite containing tungsten fibers that retard the crack propagation exhibits cyclic softening while the partially crystallized amorphous alloy exhibits stable cycling. The regions of crack initiation, stable propagation and final fracture were observed on the fracture surface. Crystalline brittle phases do not retard the crack propagation but become sites of crack initiation. Tungsten fiber reinforced BMG has the largest fracture toughness while BMG with quenched-in crystallites the smallest. Tungsten fibers stabilize crack growth in the matrix and extend the strain to failure of the composite, while brittle crystallites speed up the crack propagation even though they act as obstacles when shear bands reach them in some cases.
原文出处	://WOS:000246387700036
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/33788]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	K. Q. Qiu,D. Z. Hao,Y. L. Ren,et al. Mechanical properties for bulk metallic glass with crystallites precipitation and second ductile phase addition[J]. Journal of Materials Science,2007,42(9):3223-3229.
APA	K. Q. Qiu,D. Z. Hao,Y. L. Ren,&H. Zhang.(2007).Mechanical properties for bulk metallic glass with crystallites precipitation and second ductile phase addition.Journal of Materials Science,42(9),3223-3229.
MLA	K. Q. Qiu,et al."Mechanical properties for bulk metallic glass with crystallites precipitation and second ductile phase addition".Journal of Materials Science 42.9(2007):3223-3229.