The nominal chemical composition of TC4 grade titanium alloy material is Ti-6Al-4V. It belongs to (α+β) type titanium alloy. It has good comprehensive mechanical properties such as low density, good thermal stability and high specific strength. TC4 is the main grade in all the titanium alloy grades. It has shown the incomparable charm and strength by its outstanding performance in many high-end fields such as aerospace, military equipment, Marine engineering and medical equipment.
The composition of TC4Eli titanium alloy is Ti-6Al-4V ELI. This material is an ultra-pure titanium alloy with low clearance elements and it has excellent mechanical and technological properties. Compared to TC4, TC4Eli has a lower impurity element content and stricter composition control, so its performance is more stable and reliable.
Comparative analysis of chemical composition difference between TC4Eli and TC4 titanium alloy
TC4ELi is an improved version of TC4, which is mainly different in Al content and lower content of interstitial elements of Fe, N, H and O.
TC4 : Containing 6%α stable element Al, 4%β stable element V, Al equivalent 7.0.
TC4Eli : On the basis of TC4, the contents of interstitial elements (C, O, N) and impurity elements Fe are significantly reduced. For example, its oxygen content is capped at 0.13% (TC4 is not explicitly reduced by routine).
Mechanical properties and applicable environment
- TC4 :
Medium room temperature strength and high temperature strength, suitable for ordinary or high temperature environment (≤450℃) .
Excellent fatigue resistance, creep resistance and thermal stability, but limited performance at low temperature.
- TC4Eli :
The strength is slightly lower than TC4, but the plasticity, toughness, fracture toughness and low temperature performance are significantly improved, and can be used in ultra-low temperature (-196℃) environment.
Different processing
The smelting times are different. If there are no special requirements generally, TC4 material need to be smelted twice. TC4Eli must be smelted three times.
Application field
- TC4:
Aeroengine compressor disc/blade, aircraft bearing structural parts (such as beams, spacer frames).
Applicable temperature range is -196~450℃ (but TC4 low temperature performance is weaker than TC4Eli).
- TC4Eli :
Low temperature engineering (such as liquid hydrogen storage tank), medical implants (orthopedic/dental instruments), ship and aircraft girder and other scenarios requiring low temperature or high toughness. The biocompatibility is outstanding, so it is suitable for long-term implantation .