Effect of mechanical milling on the harmonic structure development during spark plasma sintering of Ti-5Al-2Sn-4Zr-4Mo-2Cr-1Fe β-metastable titanium alloy (β-Cez alloy)

The present study focuses on the formation of harmonic microstructures in a metastable β titanium alloy, β-Cez alloy (Ti-5Al-2Sn-4Zr-4Mo-2Cr-1Fe – Tβ = 895 °C). Previous studies emphasized mainly fabrication and improvements mechanical properties alloys prepared by powder metallurgy showing structure. In this study, structure was obtained after milling initial powder, followed Spark Plasma Sintering (SPS) process. During process, phase transformations occur that are dependent state powder. Moreover, their kinetics depend thermo-mechanical history order to analyze microstructure formation, behavior milled non-milled powders studied during heat treatment similar one applied SPS In-situ high-energy X-ray diffraction used characterize evolution phases thermal treatment. Additional situ electrical resistivity measurements were carried out sintered compact specimens. Characterizations evidenced is state. After milling, stress/strain induced α” martensite observed inside powder’s grains. stepwise microstructural characterization revealed influence mechanically α arrangement matrix consisting nodular grains shell lamellae core. formed associated with heavier deformation at surface areas contributes highly an recovery/recrystallization phenomenon α”/α heating.