用熔融自旋技术制备了Zr_(1-x)M_x(M=Fe,Co,Ni,Cu和Pd)和Cu_(67.5)Ti_(32.5)合金玻璃体。用变换转鼓切线速度的方法,确定了上述合金形成玻璃态的临界切线速度为31m/s。所有合金玻璃体经X射线衍射分析证明为玻璃态结构。用示差扫描量热器,以不同的升温速率测量了它们的热行为。在Fe_(24)Zr_(76),Ni_(24)Zr_(76)合金玻璃体中呈现出一个放热峰,而Co_(21)Zr_(79),Pd_(24.5)Zr_(75.5),Cu_(45)Zr_(55)和Cu_(67.5)Ti_(32.5)则有两个或三个放热峰。用Kissinger技术确定了各个合金玻璃的结晶激活能。最后讨论了由Miedema模型计算的二元合金的混合热对合金玻璃体形成和稳定性的影响。
The glassy alloys, Zr_(1-x)M_x (M=Fe, Co, Ni, Cu and Pd) and Cu_(67.5)Ti_(32.5), were prepared by the melt spinning technique. Their critical tangential speed of the glassy state formation was determined to be 31 m/s by means of changing the tangential speed of rotator. Their structure in a glassy state of all alloy tested has been confirmed by X-ray diffraction analysis. Their thermal behaviour was examined by differential scanning calorimetry (DSC) under different heating rates. An exothermic peak in DSC tracing was presented for glassy alloys Fe_(24)Zr_(76) and Ni_(24)Zr_(76), but two or three peaks for Co_(21)Zr_(79), Pd_(24.5)Zr_(75.5), Cu_(45)Zr_(55) and Cu_(67.5)Ti_(32.5). The activation energies for crystallization of these aUoys were evaluated by the Kissinger's method. Furthermore, the effect of heat of mixing on the formation and stability of these binary glassy alloys has been discussed after calculation used the Miedema's model.
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