Ti48Zr20Nb12Cu5Be15内生相非晶合金压缩性能研究

Research on Compression Properties of Ti48Zr20Nb12Cu5Be15 in-situ crystal phase Amorphous Alloy

摘要:

摘 要: 采用铜模喷铸法成功制备出内含β-Ti(Zr,Nb)晶体相的Ti48Zr20Nb12Cu5Be15内生相非晶合金，在室温环境下对其进行准静态和动态压缩力学性能测试，结合S-4800型扫描电镜(SEM)对压缩试样断口进行观察，并对不同应变率下的力学性能进行对比。结果表明：内生相非晶合金的结构为非晶基体和在非晶基体上均匀分布着的β-Ti(Zr,Nb)晶体相组成。Ti48Zr20Nb12Cu5Be15内生相非晶合金在准静态压缩时，随应变率的增加抗压强度有明显的提高，存在应变率硬化现象，表现出与一般非晶合金体系不同的应变率效应；在动态压缩条件下，动态抗压强度随着应变率的提高也有较明显的增加，表现为应变率硬化效应。由于内生相非晶合金在动态压缩条件下的绝热温升效应和非晶的碎化，导致在室温条件下Ti48Zr20Nb12Cu5Be15内生相非晶合金的动态压缩抗压强度和应变低于准静态压缩抗压强度和应变。

Abstract:

The Ti48Zr20Nb12Cu5Be15 amorphous alloy with in-situ ?-Ti（Zr,Nb）crystal phase was prepared by copper mould injection casting. The mechanical behavior was systematically investigated under both quasi-static and dynamic compression at room temperature. Microstructure investigations were conducted by scanning electron microscopy, the result showed that the Ti48Zr20Nb12Cu5Be15 amorphous alloy is amorphous matrix and the ?-Ti (Zr,Nb) crystal phase uniformly distributed in the matrix. The fracture stress increased with increasing strain rate, revealing strain rate hardening effect for the Ti48Zr20Nb12Cu5Be15 in-situ crystal phase amorphous alloy under individual quasi-static and dynamic compression at room temperature. It was also found that the adiabatic temperature rising and the fragment of the amorphous alloys existed on dynamic compression, leading to the fracture stress and the fracture strain during dynamic compression were much lower than that during quasi-static compression at room temperature.