(1. 南京理工大学 机械工程学院，南京 210094;
2. 中国科学院 金属研究所，沈阳 110016)
摘 要: 在室温环境下(25 ℃)对某ZrTiNiCuBe块体非晶合金材料进行不同应变率条件下的静态与动态压缩实验。并采用扫描电镜技术(SEM)对试样断口、侧面等进行表征，对比静、动态条件下的应力-应变曲线形貌的差异。结果表明:静态压缩时为剪切断裂，微观形貌上出现脉状花样与剪切带;剪切带诱发裂纹的形成，裂纹随着剪切带扩展。动态压缩时为脆性解理断裂，断面粗糙且发现大量熔滴;断口处出现解理台阶，塑性阶段出现明显的锯齿流变现象。从能量守恒定律出发，利用变形过程中弹性应变能的变化规律推测剪切变形区域内温升的变化规律，温升的变化规律揭示锯齿流变与试样的断裂机制。
关键字: 块体非晶合金;锯齿流变;绝热温升;弹性应变能
（1. College of Mechanical Engineering, Nanjing University of Technology and Engineering, Nanjing 210094, China;
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:The quasi-static and dynamic compression mechanical properties of the ZrTiNiCuBe bulk amorphous alloy were investigated under different strain rates at room temperature. The fracture and side face were characterized by the SEM technology. The results show that shear fracture happens when the alloy is quasi-static compressed, the microstructures observed are vein pattern and shear bands. The cracks are generated and propagated along the shear bands. The brittle cleavage fracture happens when the alloy is dynamic compressed, and the rough fracture surfaces containing large amount of liquid droplets are observed. The fracture exhibits the cleavage steps, and the obvious serrated flow phenomenon appears in the plastic deformation stage. In the point of energy conservation law, the temperature rise in shear bands is deduced based on the variation of elastic strain energy. The serrated flow and fracture mechanism of the ZrTiNiCuBe bulk amorphous alloy was revealed.
Key words: bulk amorphous alloy; serrated flow; adiabatic temperature rise; elastic strain energy
