TA5 (Ti-4Al) Alpha Titanium Alloy

TA5 is a Chinese α-type titanium alloy with about 4 % aluminium and a trace of boron (Ti-4Al-0.005B), corresponding approximately to international IMI-315 / Ti-3Al-type α titanium. It offers higher strength and oxidation resistance than commercially pure titanium while retaining good corrosion resistance, low density and weldability, and is used for aerospace compressor components and corrosion-resistant industrial equipment.

Overview

• Material: TA5 — Ti-4Al-0.005B α-type titanium alloy
• Approx. equivalent: IMI-315 / Ti-3Al-type α titanium
• Available forms: Bar, plate, sheet, strip, tube, wire and castings

Chemical Composition (wt%)

Other elements: each ≤ 0.10 %, total ≤ 0.40 %.

Physical Properties

• Retains strength and creep resistance at 500–600 °C;
• Better wear resistance and higher oxidation resistance than commercially pure titanium.

Mechanical Properties (annealed sheet, by thickness)

Key Features

• Relatively high strength retained at elevated temperature;
• Strong corrosion resistance against many media;
• Low density supporting lightweight design;
• Stable microstructure across temperatures.

Fabrication & Heat Treatment

• Melting & casting: vacuum arc remelting (VAR) for purity and uniform microstructure; sand casting or investment casting as required.
• Heat treatment: not hardenable by heat treatment; annealing relieves working stress and improves ductility.
• Finishing: machined and ground to required dimensions and surface finish.

Typical Applications

• Aerospace: compressor blades and discs of aircraft engines; structural parts for rockets, missiles and high-speed aircraft;
• Industry: electrodes for electrolysis, power-plant condensers, petroleum-refining and seawater-desalination heaters, and environmental-control equipment;
• Corrosion-resistant structures: vessels, piping and pump bodies for chemical, marine and desalination service.

Limitations

• Room-temperature strength is not especially high;
• Poor machinability; hot working can pick up hydrogen, oxygen, nitrogen and carbon (alpha-case / contamination);
• Wear resistance is limited — surface treatment or mating materials may be needed for severe sliding;
• Complex production process with demanding equipment and process control.

For detailed datasheets, mill certificates (EN 10204 3.1) or inquiries on specific sizes and tolerances, please contact our sales & engineering team.