A Comprehensive Analysis of the Differences between TC4 Titanium Alloy and TC4Eli Titanium Alloy

The composition of titanium alloy TC4 material is Ti-6Al-4V, which belongs to the (α+β) type titanium alloy and has good comprehensive mechanical properties. TC4 is the main grade in titanium alloys. With its outstanding performance, it has demonstrated unparalleled charm and strength in multiple high-end fields such as aerospace, military equipment, marine engineering, and medical devices.

The composition of TC4Eli titanium alloy is T1-6A1-4V, which is a low gap element ultra pure titanium alloy with excellent mechanical and processing properties. Compared with TC4, TC4Eli has lower impurity element content and stricter composition control, making its performance more stable and reliable.

TC4 and TC4EL have different names in different countries. Please refer to the following figure for details:

Comparative analysis of chemical composition differences between TC4Eli and TC4 titanium alloy;

TC4EL is an improved version of TC4, with the main difference being different Al content and lower content of interstitial elements Fe, N, H, and O. ‌

TC4: Contains 6% alpha stable element Al, 4% beta stable element V, with an aluminum equivalent of 7.0.

TC4Eli: On the basis of TC4, it significantly reduces the content of interstitial elements (C, O, N) and impurity element Fe. For example, its upper limit of oxygen content is 0.13% (TC4 is not explicitly reduced).

Mechanical properties and applicable environment

TC4:

Medium room temperature strength and high temperature strength, suitable for ordinary or high temperature environments (≤ 450 ℃).

Excellent fatigue resistance, creep resistance, and thermal stability, but limited performance in low-temperature environments.

TC4Eli:

The strength is slightly lower than TC4, but the plasticity, toughness, fracture toughness, and low-temperature performance are significantly improved, making it suitable for use in ultra-low temperature (-196 ℃) environments.

Different processing procedures:

The melting times are different. TC4 generally needs to be melted twice without special requirements, while TC4Eli must be melted three times.

Application Fields

TC4:

Aircraft engine compressor discs/blades, aircraft load-bearing structural components (such as beams, frames).

Applicable temperature range: -196~450 ℃ (but with weaker low-temperature performance than TC4Eli).

TC4Eli:

Low temperature engineering (such as liquid hydrogen storage tanks), medical implants (orthopedic/dental equipment), ship and aircraft beams, and other scenarios that require low temperature or high toughness have outstanding biocompatibility and are suitable for long-term implantation in the human body.