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通过铜模铸造法制备了具有异质结构的Zr64.2Ni16.2Cu14.6Al5和Zr63.4Ni16.2Cu15.4Al5块体非晶合金,利用X射线衍射(XRD)、高分辨透射电镜(HRTEM)和差示扫描量热法(DSC)研究了其微观结构及热稳定性。结果表明,与均匀结构的Zr65Al10Ni10Cu15块体非晶合金相比,异质结构降低了材料的热稳定性。在单轴压缩试验中,两种Zr基块体非晶合金具有大的塑性应变(>25%)和高的屈服强度(>1.6GPa)。低的STZs势能和高的剪切带扩展抗力是异质结构Zr基块体非晶合金塑性提高的主要原因。
The bulk amorphous alloys of Zr64.2Ni16.2Cu14.6Al5 and Zr63.4Ni16.2Cu15.4Al5 with heterostructures were prepared by copper mold casting method. XRD, HRTEM and differential scanning calorimetry Scanning calorimetry (DSC) was used to study the microstructure and thermal stability. The results show that the heterostructure reduces the thermal stability of the material compared with Zr65Al10Ni10Cu15 bulk amorphous alloy with uniform structure. In uniaxial compression tests, the two Zr-based bulk amorphous alloys have large plastic strains (> 25%) and high yield strength (> 1.6 GPa). Low STZs potential energy and high shear band extension resistance are the main reasons for the increase of plasticity of heterogeneous Zr-based bulk amorphous alloys.