Effect of cast process and microalloying on the fracture toughness of Zr-based bulk amorphous alloys

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Title:	Effect of cast process and microalloying on the fracture toughness of Zr-based bulk amorphous alloys
Authors:	鄭憲清;Chang, Y.S.;Hsu, K.T.;Li, J.B.;Tsai, P.H.;Jang, J.S.C.;Huang, J.C.
Contributors:	工學院材料科學與工程研究所
Keywords:	Bending;Bulk amorphous alloy;Casting;Condensed matter: structure, mechanical and thermal properties;Elasticity, elastic constants;Exact sciences and technology;Fatigue, brittleness, fracture, and cracks;Fracture mechanics;Fracture toughness;Mechanical and acoustical properties of condensed matter;Mechanical properties of solids;Metallic glasses;Microalloying;Physics;Silicon;Three point bending;Zirconium;Zirconium base alloys
Date:	2014-11-25
Issue Date:	2026-04-23 11:31:20 (UTC+8)
Publisher:	Elsevier BV;Kidlington: Elsevier B.V
Abstract:	摘要： SEM micrographs of the tilt- and suction-cast samples where near the notch root after bending test; (a) Zr53Cu30Ni9Al8 and (b) (Zr53Cu30Ni9Al8)99.25Si0.75 are tilt-cast samples, (c) Zr53Cu30Ni9Al8 and (d) (Zr53Cu30Ni9Al8)99.25Si0.75 are suction-cast samples. Note that the tilt-cast Zr-53 BMG without Si possesses the best fracture toughness among these BMGs in this study. [Display omitted] •The highest fracture toughness of 120MPam was achieved for the tilt-cast Zr53Cu30Ni9Al8.•Shear bands in the tilt-cast Zr53Cu30Ni9Al8 plate (Fig. 7(a)) appear in a finer and denser manner.•Tilt casting could effectively reduce the micro-porosity in the cast BMGs.•Si minor addition would degrade appreciably the fracture toughness. In order to clarify the effects of tilt- or suction-cast processing and microalloying of minor Si on the three-point bending fracture toughness of the Zr-based bulk metallic glasses (BMGs), the tilt-cast and suction-cast Zr53-based and Zr48-based BMGs with and without Si were studied. The results revealed that the tilt-cast specimens present much better fracture toughness than the suction-cast counterparts as a result of their lower degrees of residual porosity. In addition, the microalloying of Si to 0.75at.% in these BMGs would impose negative effects on their fracture toughness. The highest fracture toughness of 120MPam was achieved for the tilt-cast Zr53Cu30Ni9Al8. Moreover, the morphology of fracture surface, the calculated fracture energy, and the Poisson’s ratio show the similar trend to prove that the tilt-cast Zr-53 BMG without Si possesses the best fracture toughness among these BMGs in this study. 出版者： Kidlington: Elsevier B.V 出版日期： 2014-11-25 出處： Journal of alloys and compounds, 2014-11, Vol.614, p.87-93 版權： 2014 Elsevier B.V. 版權： 2015 INIST-CNRS 識別號： ISSN: 0925-8388 識別號： EISSN: 1873-4669 識別號： DOI: 10.1016/j.jallcom.2014.06.062
Appears in Collections:	[Institute of Materials Science and Engineering] journal & Dissertation

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