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Prototypic Lightweight Alloy Design for Stellar-Radiation Environments.
Matheus A Tunes1, Lukas Stemper2, Graeme Greaves3
1Chair of Nonferrous Metallurgy Montanuniversitaet Leoben Leoben A-8700 Austria.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 26, 2020
Summary
This study introduces a new crossover aluminum alloy designed for space. Its unique hardening phase, the T-phase, remarkably withstands extreme radiation, offering enhanced material durability for space exploration.
Area of Science:
- Materials Science
- Nuclear Engineering
- Aerospace Engineering
Background:
- Conventional aluminum alloys degrade in stellar radiation environments due to dissolution of hardening phases.
- This degradation leads to material softening, limiting the lifespan of components in space.
Purpose of the Study:
- To synthesize and evaluate a novel crossover aluminum alloy for enhanced radiation resistance.
- To investigate the behavior of hardening precipitates under extreme irradiation conditions.
Main Methods:
- Crossover alloying of 5xxx and 7xxx series aluminum alloys.
- In situ transmission electron microscopy (TEM) of heavy ion irradiation up to 1 dpa.
- Analysis of microstructural changes and precipitate stability.
Main Results:
- The Mg32(Zn,Al)49 hardening precipitates (T-phase) exhibited remarkable stability under irradiation.
- No cavity nucleation was observed, and displacement damage appeared as black-spots.
- A high phase fraction of hardening precipitates was identified as critical for radiation tolerance.
Conclusions:
- The developed crossover aluminum alloy demonstrates superior radiation resistance.
- High volume fraction of stable precipitates is key for designing radiation-tolerant metallic alloys for space exploration.
- New design guidelines for space-grade metallic alloys are established.
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