Zr-Cu-Ni-Al-Ta glassy matrix composites with enhanced plasticity

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	Zr-Cu-Ni-Al-Ta glassy matrix composites with enhanced plasticity
	W. B. Dong ; H. F. Zhang ; W. S. Sun ; A. M. Wang ; H. Li ; Z. Q. Hu
刊名	Journal of Materials Research
	2006
卷号	21 期号:6 页码:1490-1499
关键词	bulk metallic-glass ductile reinforcement mechanical-properties microstructure deformation behavior alloys strain phase
ISSN号	0884-2914
中文摘要	(Zr62Cu15.4Ni12.6) (x=6-12) in situ glassy composites containing uniformly distributed Ta-rich particles were prepared by arc-melting and copper mould casting. The results show that addition of 6-10 at.% Ta to Zr62Cu15.4Ni12.6Al10 results in dissolution of 2.4 to 4.6 at.% Ta in the glassy matrix, which promotes glass-forming ability, and the remaining Ta precipitates out as body-centered cubic (BCC) Ta-rich particles dispersed on the glassy matrix. The critical diameters for the composites with 6, 8, and 10 at.% Ta are 7, 7, and 6 mm, respectively. At 12 at.% Ta addition, the glass-forming ability is dramatically reduced because of the precipitation of secondary dendritic Ta-rich particles and other nanocrystallites from melts during copper mould casting. Also, owing to the solid-liquid reaction during induction heating, some Ta-rich particles formed in the master alloys will redissolve into the glassy matrix, resulting in a smaller volume fraction of Ta-rich particles in the as-cast glassy rods than that of the corresponding ingots. The glassy matrix composites exhibit enhanced plastic strain of about 7.5 to 22.5% at room temperature. The optimum Ta content in the glassy alloys is determined to be 10 at.%, which corresponds to the highest ultimate stress of 2220 MPa and the largest plastic strain of 22.5%. The plastic strain increases with increasing volume fraction of in situ BCC Ta-rich particles. This is apparently ascribed to the impedance of Ta-rich particles to shear bands. Ta-rich particles seed the initiation of multiple shear bands and block the shear band propagation, leading to intensive multiplication and bifurcation of shear bands.
原文出处	://WOS:000238191300019
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/34180]
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	W. B. Dong,H. F. Zhang,W. S. Sun,et al. Zr-Cu-Ni-Al-Ta glassy matrix composites with enhanced plasticity[J]. Journal of Materials Research,2006,21(6):1490-1499.
APA	W. B. Dong,H. F. Zhang,W. S. Sun,A. M. Wang,H. Li,&Z. Q. Hu.(2006).Zr-Cu-Ni-Al-Ta glassy matrix composites with enhanced plasticity.Journal of Materials Research,21(6),1490-1499.
MLA	W. B. Dong,et al."Zr-Cu-Ni-Al-Ta glassy matrix composites with enhanced plasticity".Journal of Materials Research 21.6(2006):1490-1499.