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采用Cu模铸造方法制备了直径2和3 mm的Zr61.5Cu21.5-xFe5Al11Sn1Nbx(x=0,1,2,原子分数,%)和Zr61.5Cu21.5Fe5Al12非晶合金棒.结果表明,Sn和Nb微合金化略微降低了Zr-Cu-Fe-Al非晶合金的玻璃形成能力.Zr61.5Cu19.5Fe5Al11Sn1Nb2非晶合金具有优异的压缩塑性,并且表现出“应变硬化”现象.高分辨透射电镜观察显示Zr61.5Cu19.5Fe5Al11Sn1Nb2和Zr61.5Cu21.5Fe5Al12合金均为完全非晶态,Sn和Nb微合金化后合金内部原子排列更紧密.正电子湮没谱分析结果表明,与Zr61.5Cu21.5Fe5Al12非晶合金相比,Zr61.5Cu19.5Fe5Al11Sn1Nb2非晶合金内部原子密排间隙和结构自由体积尺寸减小、总量增加.大量弥散分布的自由体积有利于Zr61.5Cu19.5Fe5Al11Sn1Nb2非晶合金剪切带的形成、分枝和相互作用,最终改善了非晶合金的塑性.
Zr61.5Cu21.5-xFe5Al11Sn1Nbx (x = 0, 1, 2, atomic fraction,%) and Zr61.5Cu21.5Fe5Al12 amorphous alloy rods with diameters of 2 and 3 mm were prepared by Cu-casting method.The results show that Sn and Nb microalloying slightly reduces the glass forming ability of the Zr-Cu-Fe-Al amorphous alloy.Zr61.5Cu19.5Fe5Al11Sn1Nb2 amorphous alloy has excellent compressive plasticity and shows “strain hardening” phenomenon. High resolution transmission Electron microscopy showed that all of Zr61.5Cu19.5Fe5Al11Sn1Nb2 and Zr61.5Cu21.5Fe5Al12 alloys were completely amorphous, and the atomic arrangements of Sn and Nb microalloyed alloys were more close. Positron annihilation spectroscopy analysis showed that Zr61.5Cu21.5Fe5Al12 Compared with the amorphous alloy, the interstitial spaces and the free volume of the Zr61.5Cu19.5Fe5Al11Sn1Nb2 amorphous alloy decrease and the total volume increases.The large volume of dispersed free volume is favorable for the Zr61.5Cu19.5Fe5Al11Sn1Nb2 amorphous alloy shear band The formation, branching and interaction ultimately improve the ductility of amorphous alloys.