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Enhancing Ω phase thermal stability in Al alloys through interstitial ordering.
Xiaowei Zhou1, Liwen Wang2, Chunxuan Liu2
1Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, Department of Physics, Institute of Interdisciplinary Studies, Hunan Normal University, Changsha 410081, Hunan, People's Republic of China.
Scandium enhances aluminum alloy thermal stability by occupying interstitial sites. Other elements like Lithium and Calcium also show potential for similar improvements through interstitial ordering, offering new alloy design strategies.
Area of Science:
- Materials Science
- Metallurgy
- Computational Materials Science
Background:
- Scandium (Sc) addition improves thermal stability in aluminum alloys by forming ordered interstitial phases.
- The high cost and rarity of Scandium necessitate exploring alternative elements for similar effects.
Purpose of the Study:
- To investigate the electronic-level mechanisms by which interstitial ordering of Sc enhances thermal stability in aluminum alloys.
- To computationally screen the periodic table for other elements that can improve thermal stability via interstitial ordering in aluminum alloys.
Main Methods:
- First-principles calculations were used to analyze the electronic structure and bonding.
- Computational screening of all potential metallic elements was performed.
Main Results:
- Scandium's interstitial ordering in the Ω phase of aluminum alloys significantly boosts thermal stability.
- Elements such as Lithium (Li), Calcium (Ca), Strontium (Sr), Samarium (Sm), Cerium (Ce), and Yttrium (Y) were identified as potential alternatives to Scandium.
- The study revealed the key electronic factors governing interstitial ordering and thermal stability enhancement.
Conclusions:
- Interstitial ordering is a viable mechanism for enhancing the thermal stability of aluminum alloys.
- Several alternative elements to Scandium have been identified, paving the way for cost-effective alloy design.
- This research deepens the understanding of microstructural stability and provides a foundation for developing advanced, thermally stable aluminum alloys.
