Centimeter-sized Ti-based bulk metallic glass with high specific strength  

作　　者：Pan Gong Ke-Fu Yao Xin Wang Yang Shao 

机构地区：[1]Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

出　　处：《Progress in Natural Science:Materials International》2012年第5期401-406,共6页自然科学进展·国际材料（英文版）

基　　金：supported by the National Basic Research Program of China (Grant no. 2007CB613905);the National Natural Science Foundation of China (NSFC,Grant nos. 50971073 and 51101090)

摘　　要：Based on the quaternary Ti41Zr25Be29Al5 glassy alloy with a critical diameter of 7 mm reported not long ago,an obvious enhancement of glass-forming ability(GFA) has been realized in this alloy by the addition of Cu element.A series of(Ti41Zr25Be29Al5)100-xCux(x=0,2,5,7,9,11 at%) glassy alloys have been developed and some of them can be cast into one-centimeter diameter fully glassy rods by copper mold suction casting.It has been found that Cu addition could stabilize the liquid phase and suppress the crystallization,resulting in improvement of the GFA of the alloy.The addition of Cu also increases the compressive strength of the alloy and the(Ti41Zr25Be29Al5)91Cu9 glassy alloy possesses a specific strength(defined as yield strength/density) of 4.13×105Nm/kg,which is much higher than most other reported centimeter-sized bulk metallic glasses.The present result suggests that the newly developed(Ti41Zr25Be29Al5)91Cu9 glassy alloy is a good candidate for structural applications because of its good glass-forming ability and mechanical properties.Based on the quaternary Ti41Zr25Be29Al5 glassy alloy with a critical diameter of 7 mm reported not long ago, an obvious enhancement of glass-forming ability (GFA) has been realized in this alloy by the addition of Cu element. A series of (Ti41Zr25Be29Al5)100?xCux (x=0, 2, 5, 7, 9, 11 at%) glassy alloys have been developed and some of them can be cast into one-centimeter diameter fully glassy rods by copper mold suction casting. It has been found that Cu addition could stabilize the liquid phase and suppress the crystallization, resulting in improvement of the GFA of the alloy. The addition of Cu also increases the compressive strength of the alloy and the (Ti41Zr25Be29Al5)91Cu9 glassy alloy possesses a specific strength (defined as yield strength/density) of 4.13×105 Nm/kg, which is much higher than most other reported centimeter-sized bulk metallic glasses. The present result suggests that the newly developed (Ti41Zr25Be29Al5)91Cu9 glassy alloy is a good candidate for structural applications because of its good glass-forming ability and mechanical properties.

关 键 词：METALLIC GLASSES Ti ALLOY GLASS-FORMING ABILITY MECHANICAL properties 

分 类 号：TG139.8[一般工业技术—材料科学与工程]