一种新的具有室温大塑性的Zr基块体非晶合金

A New Type of Zr-Al-Ni-Cu Bulk Metallic Glass with High Plasticity at Room Temperature

摘要:

通过二元共晶比例法设计了一种新的具有室温大塑性的Zr51Al9.96Ni14.34Cu24.7块体非晶合金。该合金室温压缩最大强度达2356 MPa，塑性应变达 14.6%。高分辨透射电镜(HRTEM)及热分析(DSC)结果表明，压缩过程的变形诱发了纳米晶化。纳米晶的形成一方面诱发新的剪切带的形成，增加了剪切带的密度；另一方面阻碍了剪切带的进一步扩展，使大量初始剪切带与二次剪切带的交割和分叉，因而导致所研究非晶合金优异的塑性变形能力。

关键词:Zr基块体非晶合金;塑性;剪切带;纳米晶

Abstract:

In present work, a new type of bulk metallic glass quaternary alloy, Zr51Al9.96Ni14.34Cu24.7, was designed by using binary eutectic clusters method. The new alloy displays a high strength up to 2356 MPa and a large plastic strain of 14.6% at room temperature according to compression test. The excellent ductility of the present glassy alloy is attributed to the deformation to induce the nanocrystalline, which can induce the formation of numerous new shear bands and enhance the density of shear bands; on the other hand, to influence the propagation of shear bands to intersect and to branch during deformation process, as a result, the plasticity of alloy is improved.

Key words:bulk metallic glass; plasticity; shear band; nanocrystalline