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采用铜模喷铸法成功制备出内含β-Ti(Zr,Nb)晶体相的Ti_(48)Zr_(20)Nb_(12)Cu_5Be_(15)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,用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。Ti_(48)Zr_(20)Nb_(12)Cu_5Be_(15)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Ti_(48)Zr_(20)Nb_(12)Cu_5Be_(15)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。
The Ti_ (48) Zr_ (20) Nb_ (12) Cu_5Be_ (15) intrinsic phase amorphous alloy containing β-Ti (Zr, Nb) crystal phase was successfully prepared by copper casting method. The specimens were tested for quasi-static and dynamic compressive mechanical properties. The fracture surface of the compressed specimens was observed by S-4800 Scanning Electron Microscope (SEM), and the mechanical properties under different strain rates were compared. The results show that the structure of the endogenous amorphous alloy is composed of an amorphous matrix and a β-Ti (Zr, Nb) crystal phase uniformly distributed on the amorphous matrix. In quasi-static compression, the compressive strength of Ti_ (48) Zr_ (20) Nb_ (12) Cu_5Be_ (15) endocrystalline amorphous alloys increases with the increase of strain rate obviously, and there exists the phenomenon of strain rate hardening. Under normal dynamic compression conditions, the dynamic compressive strength increases obviously with the increase of strain rate, which shows as the strain rate hardening effect. Due to the adiabatic temperature rise effect and amorphous fragmentation of the endogenous amorphous alloy under dynamic compression conditions, the intrinsic phase of Ti 48 Ti 20 Nb 12 Cu 5 Be 15 is not crystalline at room temperature The dynamic compressive compressive strength and strain of alloy are lower than that of quasi-static compressive compressive strength and strain.