TC21

Brief

TC21 Material Characteristics

• Phase Transition: Phase transition occurs between 950-960°C
• Original Microstructure: Consists primarily of equiaxed, spherical primary α phase, fine needle-like secondary α phase, and β matrix
• Nominal Composition: Ti-6Al-2Zr-2Sn-2Mo-1.5Cr-2Nb
• Properties: One of the titanium alloys in China with good matching comprehensive mechanical properties of high strength and toughness

Applications

• Aerospace: Used in various aerospace applications such as wing joint structural components, fuselage and landing gear connection frames, engine suspension joints, and manufacturing of critical load-bearing components with high strength and durability requirements

Research Findings

• Solution Treatment: Investigated the influence of solution treatment temperature on the microstructure of TC21 titanium alloy within the range of 880-950°C
• Microstructural Analysis: Utilized optical microscopy (OM), transmission electron microscopy (TEM), and electron backscatter diffraction (EBSD) to analyze the effect of heat treatment temperature on the formation of blocky α phase in TC21 titanium alloy
• Observations:
  • Blocky α phase observed at 880°C and 900°C, while not observed at 930°C and 950°C
  • EBSD analysis revealed a Burgers orientation relationship between the large blocky α phase and its adjacent β phase
  • Microhardness reached its minimum value after solution treatment at 900°C, increasing with temperatures above 900°C