Abstract
On the basis of the previous work on (Nd 62.5Ni 37.5) 85Al 15 alloy, Cu is selected to partially substitute Ni to form (Nd 62.5Ni 37.5− x Cu x ) 85Al 15 ( x = 0, 10, 20, 30) melt-spun alloys. The glass-forming ability (GFA) of the as-prepared alloys is evaluated by the isochronal differential scanning calorimeter (DSC) measurement. The results show that GFA increases with Cu content according to several different criterions. The isothermal crystallization behaviors in the corresponding supercooled liquid region is discussed by both Johnson–Mehl–Avrami (JMA) equation and some nucleation and growth models. The fitting shows that it is reasonable to divide the whole crystallization processes into two stages. And the fittings with the nucleation and growth models infers that with increasing Cu content, the nucleation mechanism of the primary stage changes from the quenched-in and steady-state nucleation for (Nd 62.5Ni 37.5) 85Al 15, to the steady-state nucleation for (Nd 62.5Ni 27.5Cu 10) 85Al 15 and (Nd 62.5Ni 17.5Cu 20) 85Al 15, then to the time-dependent nucleation for (Nd 62.5Ni 7.5Cu 30) 85Al 15. And the dependence of crystallization mechanisms on Cu substitution agrees well with the change of their GFAs.
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