Research on the microstructure and performance control of Ti-B20 alloy during aging process for ground equipment in weapon system
Based on the requirement of high strength use of titanium alloy materials for weapon system ground e-quipment,the factors affecting the mechanical properties of Ti-B20 alloy were analyzed.The effect of high-pres-sure torsional deformation on the microstructure evolution,aging behavior and mechanical properties of Ti-B20 alloy was investigated by metallurgical microscopy(OM),scanning electron microscopy(SEM)and X-ray diffraction(XRD).The results showed that the Ti-B20 alloy did not undergo phase transformation after high-pressure torsion-al deformation(N=10),and the deformation mode was mainly dislocation slip.The alloy treated by solution treat-ment precipitated needle-like α phase during aging and it precipitated along the grain boundaries.The high-pres-sure torsional deformation of the alloy produced a large number of high-density dislocation regions,which acted as preferential nucleation sites for the α phase during aging,and eventually formed a uniformly distributed ultrafine αphase,leading to significant precipitation strengthening.
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