Is there any relationship between hardness and strength of Ti6AL4V titanium alloy?
Apr 09, 2024
Is there any relationship between the hardness and strength of Ti6AL4V titanium alloy? The hardness of titanium alloy is not high, the hardness of pure titanium is HV280-300, the hardness of alloy is HV280-340, the strength and hardness of steel materials have some relationship, but the hardness of titanium alloy has nothing to do with strength.
Titanium alloy is not considered hard, it is only high strength.
Popularization of two concepts: strength and hardness, strength refers to the ability of the material to resist deformation and fracture, hardness refers to the ability of the material to resist other materials into their own.
Titanium alloy hardness than the general hardened steel is much lower, nitriding treatment will have a substantial increase, but still can not compare to silicon carbide, boron carbide and other high hardness materials.
When it comes to the hardest material, we have to mention Mr. Tian Yongjun of Yanshan University, who was assessed as an academician of the Chinese Academy of Sciences in 2017, and Mr. Tian's team made a nano-twinned diamond with a hardness (here is really the hardness) that reaches twice that of natural diamond, which is currently known to be the hardest material.
Titanium alloy is characterized by corrosion resistance, high strength and low density.
| Density | Young's Modulus | Shear Modulus | Bulk Modulus | Poisson's Ratio | Tensile Yield Stress | Tensile Ultimate Stress | Hardness | Uniform Elongation | |
|---|---|---|---|---|---|---|---|---|---|
| Min | 4.429 g/cm3 (0.160 lb/cu in) | 104 GPa (15.1×106 psi) | 40 GPa (5.8×106 psi) | 96.8 GPa (14.0×106 psi) | 0.31 | 880 MPa (128,000 psi) | 900 MPa (130,000 psi) | 36 Rockwell C (Typical) | 5% |
| Max | 4.512 g/cm3 (0.163 lb/cu in) | 113 GPa (16.4×106 psi) | 45 GPa (6.5×106 psi) | 153 GPa (22.2×106 psi) | 0.37 | 920 MPa (133,000 psi) | 950 MPa (138,000 psi) | -- | 18% |
