Al-Ti-Containing Lightweight High-Entropy Alloys for Intermediate Temperature Applications

Area of Science:

• Materials Science
• Metallurgy
• Alloy Design

Background:

• High-entropy alloys (HEAs) are advanced materials with unique properties.
• Lightweight elements like aluminum (Al) and titanium (Ti) are being explored for novel HEA compositions.
• Intermediate temperature applications require materials with high specific strength and stability.

Purpose of the Study:

• To design and investigate new lightweight high-entropy alloys (HEAs) containing Al and Ti.
• To evaluate the potential of these HEAs for applications at intermediate temperatures.
• To explore the substitution of traditional materials with these novel Al-Ti-containing HEAs.

Main Methods:

• Elemental screening using binary phase diagrams to select appropriate alloying elements (Cr, Mo, V).
• Design and synthesis of Al-Ti-containing HEAs.
• Phase analysis to confirm solid solution structures.
• Specific hardness testing and comparison with commercial alloys.

Main Results:

• AlCrMoTi and AlCrMoTiV HEAs were successfully designed and synthesized.
• These HEAs were confirmed to be solid solutions with minor ordered B2 phases.
• The developed HEAs exhibited superb specific hardness compared to commercial alloys.

Conclusions:

• Lightweight Al-Ti-containing HEAs demonstrate significant potential for intermediate temperature applications.
• These novel HEAs show superior specific hardness, making them viable replacements for traditional materials.
• The study highlights the feasibility of using Al-Ti-based HEAs in demanding environments.