Thermal and mechanical characterizations of a Zr-based bulk metallic glass composite toughened by in-situ precipitated Ta-rich particles

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Title:	Thermal and mechanical characterizations of a Zr-based bulk metallic glass composite toughened by in-situ precipitated Ta-rich particles
Authors:	Jang,JSC;Jian,SR;Pan,DJ;Wu,YH;Huang,JC;Nieh,TG
Contributors:	材料科學與工程研究所
Keywords:	AMORPHOUS-ALLOYS;PLASTICITY;BEHAVIOR
Date:	2010
Issue Date:	2012-03-27 16:28:41 (UTC+8)
Publisher:	國立中央大學
Abstract:	The Zr(53)Cu(30-x)Ni(9)Al(8)Ta(x) (x = 2, 4, 6, 8) bulk metallic glass composites (BMGCs) rods with a diameter of 2-4 mm have been successfully fabricated by suction casting method in this study. The thermal and the mechanical properties of these Zr-based BMGCs were systematically investigated by the combination of DSC, XRD, SEM, TEM, and compression test. The results show that a superior mechanical performance with up to 30% compressive plastic strain, 1750 MPa yield strength and 2100 MPa fracture strength at room temperature can be obtained for the 2 mm diameter rod of the Zr(53)Cu(22)Ni(9)Al(8)Ta(8) BMGC. There are two kinds of in-situ dispersed Ta-rich particles, micro-sized (10-30 mu m), and nano-sized (20-80 nm) were found homogeneously distributed in the amorphous matrix. These Ta-rich particles act as discrete obstacles in the amorphous matrix, which separates and restricts the highly localized shear-banding, avoiding shear-through of the whole sample. This results in the formation of multiple shear bands around the Ta-rich particles and decreases the stress concentration for further propagation of shear band, and so as to enhance plasticity dramatically. In addition, the Ta-added BMG also exhibits similar GFA in comparison with the base BMG. (C) 2009 Elsevier Ltd. All rights reserved.
Relation:	INTERMETALLICS
Appears in Collections:	[Institute of Materials Science and Engineering] journal & Dissertation

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