高Cu高强Zr基块体非晶合金的制备与力学性能(英文)

Preparation and Mechanical Properties of High Strength Zr-Based Bulk Metallic Glasses Containing High Content of Cu

利用铜模铸造的方法制备了(Zr41.2Ti13.8Ni10Be22.5)1-x/87.5Cu12.5+x (x=1.6,6,11.2)块体非晶合金及其复相组织,分析了合金的相组成、热稳定性、力学性能及断口形貌。结果表明:随着铜含量的不断增多,尽管过冷液相区(△Tx)逐渐增大,但非晶形成能力却不断下降。当合金的铜含量提高到 18.5%时,非晶合金的压缩断裂强度达到 2.2 GPa,进一步增加铜含量到 23.7%,压缩强度出现下降趋势。

The novel Zr-Ti-Cu-Ni-Be metallic glasses and composite with different contents of copper prepared by inject casting method are presented. The compositions and microstructures of these alloys were analyzed by using XRD and SEM. And the thermal stability was studied with differential scanning calorimeter （DSC）. It is revealed that the value of △Tx is increased gradually with the increase of copper content in Zr-Ti-Cu-Ni-Be alloys whereas the glass forming ability is decreased, indicating that △Tx could not characterize their glass forming ability. In contrast, it is found that the glass forming ability is much higher when the component is close to eutectic spot. The compression test reveals that increasing of the content of copper in Zr-Ti-Cu-Ni-Be alloys can improve the mechanical property of the alloy significantly. The compressive fracture strength as high as 2.2 GPa can be obtained for the Zr-Ti-Cu-Ni-Be metallic glass with 18.5% Cu.