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Enhancement of glass-forming ability and plasticity of Cu-rich Cu–Zr–Al bulk metallic glasses by minor addition of Dy

Published online by Cambridge University Press:  04 July 2014

B.W. Zhou ,
L. Deng ,
X.G. Zhang ,
W. Zhang ,
H. Kimura  and
A. Makino
B.W. Zhou
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China
L. Deng
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China
X.G. Zhang*
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China
W. Zhang
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China
H. Kimura
Affiliation:
Institute of Materials Research, Tohoku University, Sendai 980-8577, Japan
A. Makino
Affiliation:
Institute of Materials Research, Tohoku University, Sendai 980-8577, Japan
*
a)Address all correspondence to this author. e-mail: zxgwj@dlut.edu.cn
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Abstract

(Cu0.47Zr0.45Al0.08)100–xDyx (x = 0, 1, 2, 3, 4; at.%) metallic glasses with greatly enhanced glass-forming ability (GFA) and plasticity were synthesized based on microalloying technique. The structure, thermal stability, and elastic properties of the BMG samples were studied by x-ray diffraction (XRD), differential scanning calorimetry (DSC), and ultrasonic measurements, respectively. With addition of minor dysprosium (Dy), fully metallic glassy rods with diameters exceeding 20 mm could be successfully fabricated by copper mold casting. In addition, the Cu–Zr–Al–Dy BMGs exhibit good mechanical properties under a compressive deformation mode, i.e., high yield strength of 1735–1906 MPa, Young's modulus of 85–100 GPa, and distinct plastic strain up to 4.02%. The strength and plasticity show remarkable correlations with glass transition temperature and Poisson's ratio, respectively. The role of minor Dy addition in enhancement in GFA and mechanical property of the Cu-rich BMGs is also discussed.

Keywords

bulk metallic glasscopper-rich alloysmicroalloying techniqueglass-forming abilitymechanical property
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 12 , 28 June 2014 , pp. 1362 - 1368
Copyright
Copyright © Materials Research Society 2014 

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