Abstract
0.1wt% Boron addition effect on dynamic compression properties of Ti-6Al-4V (Ti-64A) alloy are investigated by Split Hopkinson Pressure Bar (SHPB). In the study, and relative damage mechanism is also analyzed. The results show that, as-cast microstructure is refined due to 0.1% Boron addition and also to lower the non-uniform distribution of strain, stress or local concentration due to inharmonic deformation. As well as both dynamic strain and average dynamic flow stress is improved with a reduction of the sensitivity of adiabatic shear behavior. As deformation microstructure loaded at high strain rate with 0.1wt% boron addition, Dynamic strain and maximum absorbed energy is decrease 10%~30% compare with Ti-64A alloy. Both Ti-64A and Ti-6Al-4V-0.1B (Ti-64B), average dynamic flow stress is close. At high speed impact load, it exhibits a damage of adiabatic shear and TiB phases bear loading during fracture. Adiabatic shear band ismain reason of Ti-64A and Ti-64B alloys fracture failure through the deformed specimens’ microstructure observation. Adiabatic shear band formation and expansion is a precursor of material shear fracture failure. Deformation cavity can be formation between TiB phase and matrix during the deformation process, but not the main reason of material fracture failure.
Highlights
Among the Į+ȕ titanium alloys, Ti-64A alloy is the most popular titanium alloy, widely used in the aerospace, power generation, chemical, and biomedical industries because of high specific particular strength and good corrosion resistance [1-3]
The alloy is usually served under high speed impact loading, and it is required to posse a good capacity to retain the integrity and continuity of their structure when loaded at high strain rates
In order to subject the samples to higher strain rates, the dynamic loading was performed at room temperature on a modified Split Hopkinson Pressure Bar (SHPB) system
Summary
Among the Į+ȕ titanium alloys, Ti-64A alloy is the most popular titanium alloy, widely used in the aerospace, power generation, chemical, and biomedical industries because of high specific particular strength and good corrosion resistance [1-3]. The alloy is usually served under high speed impact loading, and it is required to posse a good capacity to retain the integrity and continuity of their structure when loaded at high strain rates. Research shows that the dynamic compressive mechanical properties of Ti-64A alloy depend on the alloy composition, organizational status, composition and distribution of microscopic characteristics [4-8]. In addition to refined as-cast microstructure [9-14] affects. The present study is mainly devoted to understand 0.1wt% Boron addition Effect on dynamic compressive mechanical properties of Ti-64A alloy with different microstructures
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