Metallographic Atlas of Titanium and Titanium Alloys--I
Alpha Type Titanium Alloy
Alpha + Beta Titanium Alloy
β-type Titanium Alloy
Intermetallic Compound
Cast titanium Alloy
According to the provisions of the national standard GB/T3602.1-2007, industrial pure titanium is divided into TA1, TA1ELI, TA1-1, TA2 and other 9 grades according to the content of impurity elements, and the phase transition point is 900℃. Industrial pure titanium is mainly used in applications requiring high plasticity, appropriate strength, good corrosion resistance and weldability. They have excellent cold and hot working properties and can be used to produce a variety of sheets, bars, profiles, strips, tubes and foil. Generally in the state of annealing delivery. The mechanical properties of pure titanium plate specified in the national standard GB/T3621-2007 are shown in Table 1-1.The microstructures of TA1, TA2 and TA3 were shown in Fig. 1-1~ 1-5.
| Grade of Titanium | Status | Thickness Of the Sheets (mm) | Tensile Strength (Rm/MPa) | Yield Strength (Rp0.2/MPa) | Enlongation (A/%) |
| TA 1 | M | 0.3 - 25.0 | ≥ 240 | 140 - 310 | ≥ 30 |
| TA 2 | M | 0.3 - 25.0 | ≥ 400 | 275 - 450 | ≥ 25 |
| TA 3 | M | 0.3 - 25.0 | ≥ 500 | 380 - 550 | ≥ 20 |
| TA 4 | M | 0.3 - 25.0 | ≥ 580 | 485 - 655 | ≥ 20 |
Table 1 Mechanical Property
Fig 1-1: Annealed microstructure of TA1 plate at 650℃/1h: Equiaxed α+ a small amount of intercrystalline β (dark)
Fig 1-2: The microstructure of TA3 plate annealed at 800℃/1h: equiaxed α+ transformation β containing acicular α
Fig 1-3: TA2 large size bar at 600℃/1h annealing state microstructure: equiaxed α
Fig 1-4: The microstructure of TA2 precision forged bars annealed at 600℃/1h: equiaxed α
Fig 1-5: Incomplete recrystallization structure of TA3 plate annealed at 450℃/1h: a small amount of equiaxed α+ elongated strip α
