PREPARATION AND MECHANICAL PROPERTIES OF Zr46.9Cu45.5Al5.6Y2.0 IN SITU BMG COMPOSITES WITH B2-CuZr PHASE

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	PREPARATION AND MECHANICAL PROPERTIES OF Zr46.9Cu45.5Al5.6Y2.0 IN SITU BMG COMPOSITES WITH B2-CuZr PHASE
	Shen Yong; Xu Jian
刊名	ACTA METALLURGICA SINICA
	2015-11-01
卷号	51 期号:11 页码:1407-1415
关键词	bulk metallic glass composite B2-CuZr fracture toughness
ISSN号	0412-1961
通讯作者	Shen Yong(yongshen@imr.ac.cn)
英文摘要	Bulk metallic glass (BMG) composites containing B2-CuZr phase are of interest due to they behave large plastic strain and apparent work hardening in tension. Nevertheless till now most BMG composites containing B2-CuZr phase are based on Cu-47 Zr-5(47) Al-5(5) or Zr48Cu47 5Al4Co0.5 BMG, which has limited glass forming ability (GFA). The prepared sample size is small, which restricts their potential engineering structural applications. In this work, Zr-Cu-Al-Y quaternary system is selected due to its high GFA. By tuning composition close to CuZr alloy in Zr-Cu-Al-Y quaternary system, Zr46.9Cu45.5Al5.6Y2 0 BMG is selected because it has proper GFA (critical diameter D-c=5 mm) and relatively large fracture toughness (K-Q=(49 +/- 3) MPa.m(1/2)). By decreasing the cooling rates of the melt via increasing diameter of casting rods, large-sized in situ Zr-46 9Cu45.5Al5.6Y2.0 BMG composites containing 13% and 25% volume fractions spherical B2-CuZr phase were prepared in the casting rods with 6 and 7 mm in diameters, respectively. In compression testing, the in situ BMG composites containing 25%B2-CuZr phase promote multiple shear bands within glass matrix and remarkable global plastic deformation, accompanied by a large compressive plastic strain as 6.5%. Nevertheless in tension testing no obvious global ductility was achieved, which attributes to the low mode I fracture toughness and small plastic zone size (R-P=88 mu m, R-P=(1/3 pi)(K-Q/sigma(y))(2)) of glass matrix. Three point bending test results show that Y has an adverse effect on the fracture toughness and plastic zone size of Zr-Cu-Al BMGs. In contrast to Zr46.9Cu45 5Al5.6Y2 0 BMG, fatigue pre-cracked Zr48Cu45Al7 BMG plate samples can be prepared and exhibit a high fracture toughness (K-Q=(62 +/- 3) MPa.m(1/2)) and a large plastic zone size (R-P=150 mu m) in plane strain state. Our results show that GFA and fracture toughness of glass matrix should be balanced when designing new BMG composites containing B2-CuZr phase.
资助项目	National Natural Science Foundation of China[51171180]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000365456100014
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/121257]
专题	金属研究所_中国科学院金属研究所
通讯作者	Shen Yong
作者单位	Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Shen Yong,Xu Jian. PREPARATION AND MECHANICAL PROPERTIES OF Zr46.9Cu45.5Al5.6Y2.0 IN SITU BMG COMPOSITES WITH B2-CuZr PHASE[J]. ACTA METALLURGICA SINICA,2015,51(11):1407-1415.
APA	Shen Yong,&Xu Jian.(2015).PREPARATION AND MECHANICAL PROPERTIES OF Zr46.9Cu45.5Al5.6Y2.0 IN SITU BMG COMPOSITES WITH B2-CuZr PHASE.ACTA METALLURGICA SINICA,51(11),1407-1415.
MLA	Shen Yong,et al."PREPARATION AND MECHANICAL PROPERTIES OF Zr46.9Cu45.5Al5.6Y2.0 IN SITU BMG COMPOSITES WITH B2-CuZr PHASE".ACTA METALLURGICA SINICA 51.11(2015):1407-1415.