Tailorable Burning Behavior of Ti14 Alloy by Controlling Semi-Solid Forging Temperature

Area of Science:

• Materials Science
• Metallurgy
• Aerospace Engineering

Background:

• Semi-solid processing (SSP) is a near-net-shape forming technology with potential for titanium alloys.
• Titanium alloys require excellent burn resistance for advanced aero-engine applications.
• SSP can improve titanium alloy formability and mechanical properties, but its effect on burn resistance needs investigation.

Purpose of the Study:

• To evaluate the burning behavior of Ti14 burn-resistant titanium alloy processed via SSP at varying temperatures.
• To understand the relationship between semi-solid forging temperature, microstructure, and burn resistance.

Main Methods:

• Ti14 alloy was forged at different semi-solid temperatures.
• Burning tests were conducted with varying durations and velocities.
• Microstructural analysis of burned samples was performed.

Main Results:

• Burning behavior is significantly influenced by semi-solid forging temperature.
• Higher forging temperatures promote Ti₂Cu precipitation within grains and at boundaries.
• A Cu-enriched layer forms, hindering oxygen transport and enhancing burn resistance.

Conclusions:

• Semi-solid forging temperature is a critical parameter for tuning the burn resistance of Ti14.
• Optimizing forging temperature can improve the performance of titanium alloys in high-temperature applications.
• SSP offers a viable route to enhance burn-resistant titanium alloys for aerospace.