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采用分离式Hopkinson压杆装置(SHPB)和扫描电镜(SEM)技术研究了不同高应变率下Zr基非晶合金样品(Zr55Cu30Al10Ni5)的变形行为和断口形貌。研究发现与准静态压缩形变相比,高应变率水平(3400 s-1和1900 s-1)下,非晶合金样品断裂应力显著降低,最大降低约达40%。扫描电镜形貌观察表明,非晶合金的高速断裂发生在一条主剪切带上,主剪切面偏离45°最大切应力面。同时断口形貌为明显的脉络花样,并覆盖有大量液滴状和不规则形状熔融物,表明高应变率下断裂表面温升较准晶态断裂有所增加。
Deformation behavior and fracture morphology of Zr-based amorphous alloy samples (Zr55Cu30Al10Ni5) under different high strain rates were studied by using separate Hopkinson pressure bar device (SHPB) and scanning electron microscope (SEM). The results show that at high strain rates (3400 s-1 and 1900 s-1), the stress at break of amorphous alloy samples decreases significantly and the maximum reduction is about 40% compared with quasi-static compressive deformation. Scanning electron microscopy observation shows that the high-speed fracture of amorphous alloy occurs in a main shear zone, and the principal shear plane deviates from the maximum shear stress plane of 45 °. At the same time, the morphology of the fracture surface is obvious vein pattern, and covered with a large number of droplet-like and irregular-shaped melts, indicating that the temperature rise of the fracture surface under high strain rate is more than that of quasi-crystalline fracture.