Effect of temperature on microstructure and mechanical properties of ECAPed (TiB + La2O3)/Ti-6Al-4V composites

Synergistic strengthening behavior and microstructural optimization of hybrid reinforced titanium matrix composites during thermomechanical processing

“…From the fracture morphology, no TiB whiskers and oxide particles were pulled out from the matrix, indicating the superior strengthening effect and the strong interface cohesion between the reinforcements and titanium matrix. Meanwhile, previous study showed that cracks would preferentially occur in TiB whiskers and defects during the stretching process [19]. Consequently, the internal cracks formed, the load bearing capacity of TiB whiskers decreased, and the matrix cannot withstand the high stress, which accelerated the fracture, greatly reduced the ductility and even caused the brittle fracture.…”

“…The large-size TiB whiskers were easily fractured into short fibers during hot forging, resulting in the decrease of the aspect ratio and creating defects. From the study of TC4-based composites [19,20], nano-scale La2O3 particles could form with the addition of La in Ti6Al4V matrix. However, different results were observed.…”

“…Fortunately, several published works have shown that hot working and heat treatment can be used to tailor the microstructure and improve corresponding mechanical properties [15][16][17][18][19]. Up to now, the effect of conventional hot working include forging [15], extrusion [16,17], rolling [18], ECAP [19], etc on the TMCs have been investigated, which play a successful role in tailoring the microstructure and improving the strength and ductility.…”

“…Fortunately, several published works have shown that hot working and heat treatment can be used to tailor the microstructure and improve corresponding mechanical properties [15][16][17][18][19]. Up to now, the effect of conventional hot working include forging [15], extrusion [16,17], rolling [18], ECAP [19], etc on the TMCs have been investigated, which play a successful role in tailoring the microstructure and improving the strength and ductility. Among these hot working processes, forging is regarded as the most economical and convenient process, which significantly reduces casting defects and aligns discontinuous particles/whiskers perpendicular to the forging direction, further forming the reinforcement-rich and the reinforcement-lean region during the forging process.…”

A Review—Effect of Accelerating Methods on Gas Nitriding: Accelerating Mechanism, Nitriding Behavior, and Techno-Economic Analysis

“…In addition, the nitriding temperature will also affect the chemical reaction and the affinity between the nitrided layer and the substrate, thereby affecting its bonding strength and corrosion resistance [77]. For example, Xiang et al [78] found that nitriding at low temperatures resulted in a denser nitrided layer, improving its corrosion resistance and fatigue life.…”