WANG Longbao State Key Laboratory of Rapidly Solidified Non-Equilibrium Alloys
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Institute of Metal Research Academia Sinica
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Shenyang
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ChinaDAVIES H A School of Materials
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University of Sheffield
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U.K
金属学报(英文版)
Studies were made of the effect of mechanical pulverization on relaxation,crystallization and brittle-ductile transition of the anneal-embrittled Fe_(75)Si_(10)B_(15) metallic glass rib- bon.Results show that the Curie temperature,T_C,decreases and the total enthalpy of relaxation increases gradually with variation of pulverized time.DSC traces reveal an extra exothermic peak,T_X_1,and a distinct glass transition endothermic peak,T_g_1,with increasing pulverized time,T_C,T_X_1,and T_g_1 decrease simultaneously,and the exother- mic peak area corresponding to T_X_1 increases gradually.The surface slip-steps of flaky particles and their corresponding shear are produced by pulverizing the pre-embrittled amorphous glass.The lost ductility of the glass may restore during annealing.
关键词:
mechanical pulverization
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LU Ke State Key Laboratory for RSA
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Institute of Metal Research Academia Sinica
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Shenyang
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China
金属学报(英文版)
A new microstructure model is developed for amorphous alloys,so called Cluster medel, in which the amorphous phase is thought of composing of randomly distributed ordered clusters of different sizes.Thermodynamic calculation on this model deduces a parameter describing the glass forming ability of metallic alloys:α_c=(1-2.08/Φ_m)T_g/T_m,where T_g is gass transition temperature,T_m is the melting temperature,and Φ_m is entralpy change of melting.It is believed that easy glass forming alloy systems have larger values of a_c.This new criterion of GFA not only provides the theoretical background for several GFA criteria in the literature cited,but also can predict the GFA of many alloy systems more reasonably and accurately.
关键词:
amorphous metal
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