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Basic characteristics of TA18 titanium alloy

TA18 titanium alloy is mainly composed of titanium, aluminum, iron and other elements. Its typical composition is: titanium (Ti) about 88.5-92.5%, aluminum (Al) about 6.0-7.5%, iron (Fe) about 0.3-0.5%. The "TA" in its name stands for titanium-aluminum alloy, and the number "18" refers to the aluminum content of the alloy of about 18%. This alloy belongs to the α-β type titanium alloy, with a dual-phase structure of α phase and β phase, which has excellent performance in mechanical properties, corrosion resistance and high temperature resistance.

TA18 titanium alloy has high strength and good plasticity, and can maintain good mechanical properties under normal temperature and high temperature conditions. Especially at high temperatures, the oxidation resistance and corrosion resistance of the alloy make it an ideal high-temperature structural material. The density of TA18 alloy is low, about 4.4g/cm³, which is lighter than aluminum alloy and steel, so it has important advantages in engineering projects requiring lightweight.

‌The main chemical components of TA18 titanium alloy include titanium (Ti), aluminum (Al), vanadium (V) and iron (Fe). ‌Specifically, the typical chemical composition of TA18 titanium alloy is as follows:

‌Titanium (Ti)‌: matrix component, content between 89% and 90%‌
‌Aluminum (Al)‌: 5.5% to 6.5%‌
‌Vanadium(V)‌: 3.5% to 4.5%‌
‌Iron (Fe)‌: ≤ 0.3%‌
‌Oxygen (O)‌: ≤ 0.15%‌
‌Nitrogen (N)‌: ≤ 0.05%‌
‌Hydrogen (H)‌: ≤ 0.015%‌
‌Carbon (C)‌: ≤ 0.08%‌

The contents of these components have a significant impact on the properties of TA18 titanium alloy. For example, an increase in oxygen content will increase the strength of the alloy, but reduce its plasticity; excess hydrogen will lead to hydrogen embrittlement, making the alloy brittle.

Effect of ingredients on performance
The composition of TA18 titanium alloy has an important impact on its mechanical properties and corrosion resistance. Through appropriate heat treatment, such as solution treatment, aging treatment and quenching treatment, its performance can be significantly improved. Solution treatment is usually carried out in the temperature range of 900℃ to 950℃. It maintains the uniform structure of the alloy through rapid cooling, thereby improving strength and maintaining good plasticity and toughness.

Aging treatment is carried out in the temperature range of 500℃ to 600℃ to stabilize and strengthen the structure of the alloy and improve creep resistance and fatigue strength‌
Quenching treatment uses water quenching or oil quenching to improve the hardness and wear resistance of the alloy‌

Main application areas of TA18 titanium alloy

Aerospace field

In the aerospace field, TA18 titanium alloy is often used as a key material for aircraft engines, aircraft structural components and spacecraft due to its high strength, low density and excellent high temperature resistance. Its good corrosion resistance is particularly suitable for environments exposed to high temperatures and strong aerodynamic forces. For example, in the turbine blades and high-temperature structural parts of aircraft engines, TA18 alloy can provide sufficient strength and durability to ensure the stable operation of components under extreme conditions.

Chemical and marine engineering

Due to the excellent corrosion resistance of TA18 titanium alloy in strong acid, strong alkali and seawater environments, the alloy has been widely used in chemical equipment, offshore platforms and marine engineering. For example, TA18 titanium alloy materials are often used in seawater desalination equipment, petrochemical equipment and deep-sea oil and gas production to make core components such as pipes, containers, and heat exchangers. These applications require that the material not only has excellent corrosion resistance, but also has good mechanical strength and toughness, and TA18 alloy just meets these requirements.

Medical devices

TA18 titanium alloy is also gradually showing its unique advantages in the field of medical devices. Titanium alloy is widely used in medical devices such as artificial joints and dental implants due to its good biocompatibility. In this application, TA18 alloy can not only provide sufficient strength support, but also has good wear resistance and corrosion resistance, which helps to improve the service life of implants and patient comfort.