TC1 (Ti-2Al-1.5Mn) Near-Alpha Titanium Alloy

TC1 is a Chinese near-α (Ti-Al-Mn) titanium alloy. With strength slightly above commercially pure titanium but excellent workability and weldability, it is used for formed and welded sheet-metal structures, heat-shielding components and light-duty airframe parts operating below about 350 °C.

Overview

• Material: TC1 — Ti-Al-Mn near-α titanium alloy
• Nominal composition: Ti-2Al-1.5Mn
• Available forms: Bar, plate, sheet and forgings

Chemical Composition (wt%)

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

Physical Properties

Mechanical Properties (annealed)

Key Features

• Good process ductility for complex shapes;
• Excellent weldability for welded structures;
• Good thermal stability for long-term service at 350 °C;
• Slightly higher strength than CP titanium with some load capacity;
• Good corrosion resistance in many environments.

Fabrication & Heat Treatment

• Melting: two vacuum arc remelts (VAR); Mn added as an Al-Mn master alloy; first melt under vacuum, second under argon.
• Hot working: forged, hot-rolled or hot-extruded at 850–950 °C with controlled heating.
• Cold working: cold rolled and cold drawn with intermediate annealing.
• Welding: good weldability, typically TIG welding with clean workpiece surface.
• Annealing: sheet / sheet parts 580–750 °C for 0.5–2 h, air cool; bar / forgings 700–850 °C for 1–2 h, air cool.
• Vacuum annealing: 600–700 °C for 0.5–2 h, furnace cool to below 200 °C then air cool (furnace pressure ≤ 9×10^-5 Pa).
• Stress-relief annealing: 520–560 °C for 0.5–2 h, air cool (air or vacuum furnace).

Typical Applications

• Aerospace: formed and welded sheet-metal parts (rear fuselage tail, skin, outer panels) and engine casings / heat shields;
• Civil industry: automotive silencers, frames and suspension brackets.

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