在水冷铜坩埚中采用铜模吸铸法制备出直径Φ3mm的(Zr0.55Al0.10Ni0.05Cu0.30)100-xNbx(x=0,2,4,6,8,10)合金试样,利用X射线衍射(XRD)、差热分析(DSC)、扫描电镜(SEM)以及准静态压缩试验方法研究了Nb含量对Zr55 Cu30Ni5Al10块体金属玻璃的非晶形成能力、热稳定性、力学性能和组织的影响.研究结果表明,添加适量的Nb元素能提高Zr55 Cu30Ni5Al10合金的热稳定性和非晶形成能力.当Nb含量为x=8时,合金具有最宽的过冷液相区(△Tx =86 K)和最大的非晶形成能力(参数γ=Tx/(Tg+T1)=0.416).对于Zr55Cu30Ni5Al10合金,优化Nb元素掺杂量可以获得最佳的非晶形成能力和热稳定性.Nb的适量添加也有利于提高Zr55Cu30Ni5Al10块体金属玻璃的压缩断裂强度和塑性变形能力,其中x=8时,合金的压缩断裂强度和塑性应变量分别达到1877MPa和1.92％,并具有加工硬化现象.
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