A criterion for evaluating glass-forming ability of alloys.

A criterion defined as θ=(Tx+Tg)/Tl[(Tx-Tg)/Tl]α (where Tx is the onset crystallization temperature, Tg is the glass transition temperature, Tl is liquidus temperature, and α is an exponent) is proposed to evaluate the glass-forming ability of alloy systems. Regression analysis between the logarithm of the critical cooling rate ln Rc and θ yields value of α=0.0728. There exists a fine linear relationship between criterion θ and ln Rc with a coefficient of determination R2=0.942. The obtained relationship can be expressed as: ln Rc=(30.10±0.91)-(27.93±0.97) θ. The comparisons of θ with all other relevant parameters: φ{=Trg[(Tx-Tg)/Tg]0.143}, γ[=Tx/(Tl+Tg)], Trg(=Tg/Tl), β[=TxTg/(Tl-Tx)2], δ[=Tx/(Tl-Tg)] show that this criterion has the best ability for evaluating the GFA of alloys. [ABSTRACT FROM AUTHOR]