Materials Transactions Online

Materials Transactions, Vol.47 No.02 (2006) pp.450-453
© 2006 The Japan Institute of Metals

Effects of Yttrium and Erbium Additions on Glass-Forming Ability and Mechanical Properties of Bulk Glassy Zr--Al--Ni--Cu Alloys

Jun Luo, Huiping Duan, Chaoli Ma, Shujie Pang and Tao Zhang

Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, P. R. China

Effects of yttrium and erbium additions on glass-forming ability (GFA), thermal stability and mechanical properties of glassy Zr55Al10Ni5Cu30 alloy were studied. (Zr0.55Al0.10Ni0.05Cu0.30)100-xREx (RE = Y, Er and x=0,0.5,1,2,3,5 at%) metallic glasses were formed by melt-spinning and copper mold casting. It was found that the addition of Y or Er greatly enhanced the glass-forming ability, thermal stability and mechanical properties of Zr55Al10Ni5Cu30 alloy. The alloys containing 1--3 at% Er can be cast into glassy rods with a diameter of 15 mm, which is larger than the critical diameter (10 mm) of the base alloy in the present work. With the addition of 1 at% Y, supercooled liquid region Δ Tx of the base alloy was extended from 89 to 102 K, compressive strength was increased from 1650 to 1800 MPa and plastic strain reached a value as high as 3.5%.

(Received 2005/11/28; Accepted 2006/1/12; Published 2006/2/15)

Keywords: metallic glass, rare earth, glass-forming ability, thermal stability, mechanical property

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