Study on Optimization of Room Temperature Plasticity of Nb-Ti-Al Alloy Extruded Rods by High-Temperature Quenching AITranslate

Basic Information:

DOI：

Chinese Library Classification Number:TG146.416[金属学及工艺—金属材料]

Citation Information:

The room temperature mechanical properties and microstructure of as-extruded and extruded plus high-temperature(1150℃,1200℃,1250℃,and 1300℃)quenched low-density niobium alloy(Nb-35Ti-5Al-5V-1Zr-0.08C)rods were studied through room temperature tensile experiments and metallographic observations.The mechanism of the significant improvement in room temperature plasticity of the quenched alloy was also explored.The results show that compared with the as-extruded alloy,the room temperature elongation at break and reduction of area of the four high-temperature quenched alloys were significantly improved.Among them,the alloy quenched at 1300℃exhibits the highest room temperature elongation at break(18.5%)and the highest reduction of area(48%).Due to coarse matrix grains and large and segregated TiC second-phase particles,the as-extruded niobium alloy rods undergo brittle fracture during room temperature tensile testing.High-temperature quenching promotes the dissolution of TiC se-cond-phase particles back into the matrix,and the increase in quenching temperature further enhances the refinement and spheroidization of TiC second-phase particles.High-temperature quenching also induces the transformation of some coarse grains into subgrain structures,resulting in a grain refinement effect and ultimately greatly improving the room temperature plasticity of the low-density niobium alloy extruded rods.