Machining chips of Ti-15V-3Cr-3Al-3Sn metastable beta titanium alloy were consolidated using back pressure-assisted equal-channel angular pressing (BP-ECAP) using different processing conditions. Near fully dense specimens were obtained after multiple passes done at 500 °C with the aid of different back pressures. SEM and TEM observations show that ECAP resulted in a homogeneous formation of ultrafine equiaxed α grains (~ 180 nm) in the β matrix, due to the generation of an extensive amount of dislocations, vacancies and sub-grain boundaries during ECAP. Most of these α grains showed a random orientation with the β matrix. In addition, the observed grain refinement, increase in dislocation density and age hardening caused by this process resulted in a significant microhardness enhancement in the obtained parts. The microhardness homogeneity was improved as the processing temperature and the number of ECAP passes were increased.

Ti-15V-3Cr-3Al-3Sn亚稳态β钛合金的切削屑在不同的加工条件下采用背压辅助等通道角挤压（BP-ECAP）进行固结。在500°C下通过不同背压进行多次通过后，获得了近乎完全致密的样品。SEM和TEM观察表明，由于ECAP期间产生了大量的位错，空位和亚晶界，因此ECAP在β基体中均匀形成了超细等轴α晶粒（〜180 nm）。这些α晶粒中的大多数都与β呈随机取向矩阵。此外，观察到的晶粒细化，位错密度的增加和由该过程引起的时效硬化导致所获得零件的显微硬度显着提高。随着加工温度和ECAP通过次数的增加，显微硬度均匀性得到改善。