Thermal stability and mechanical properties ofGd-Co-Al bulk glass alloys
(1. Institute for Metal Research, Hunan University, Changsha 410082, China; 2. Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan )
Abstract: The glass forming ability of Gd-Co-Al ternary alloy systems with a composition ranging from 50% to 70% (molar fraction) for Gd and from 5% to 40% (molar fraction) for Al were investigated by copper mold casting and Gd60Co25Al15 bulk glass alloy cylinders with the maximum diameter of 5 mm were obtained. The reduced glass transformation temperature (Tg/Tm) and the distance of supercooling region ∆Tx are 0.616 and 45 K, respectively for this Gd-Co-Al alloy. The compressive fracture strength (σf) and elastic modulus (E) of Gd-Co-Al glassy alloys are 1 170−1 380 MPa and 59−70 GPa, respectively. The Gd-Al-Co bulk glassy alloys with high glass forming ability and good mechanical properties are promising for the future development as a new type function materials.
Key words: bulk metallic glass; Gadolinium-cobalt-aluminum alloy; glass-forming ability; mechanical property