Tensile behavior at cryogenic temperatures of Al 7075 + 1.8%wt Zr alloy processed by L-PBF
(2026) Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing — Vol. 966, p. 150364 (2026)
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Tiphéne et al. - 2026 - Tensile behavior at cryogenic temperatures of Al 7.pdf
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Avettand-Fénoël, Marie-Noëlle 
- Abstract
- (en) Additive manufacturing now enables the processing of high-strength Al 7xxx alloys through laser powder bed fusion (L-PBF). This work investigates the tensile behavior of an Al 7075 + 1.8%wt Zr alloy at room temperature and 77 K, addressing its potential for cryogenic applications. As-built specimens show moderate strength but maintain high ductility at both temperatures, whereas an optimized thermal treatment markedly improves strength, reaching a yield stress 680 MPa at 77 K, comparable to wrought Al 7075-T6. Modeling of thermally activated strengthening mechanisms provides results consistent with experimental findings, supporting the interpretation of strengthening contributions. Postmortem analysis confirms ductile fracture mode in all samples, with temperature and thermal treatment exerting limited influence on failure mechanisms. These results highlight the potential of L-PBF-processed Al 7xxx alloys for demanding structural applications requiring high strength at cryogenic temperature.
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Citations
Tiphene, G., Nothomb, N., Avettand-Fénoël, M.-N., & Simar, A. (2026). Tensile behavior at cryogenic temperatures of Al 7075 + 1.8%wt Zr alloy processed by L-PBF. Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, 966, 150364. https://doi.org/10.1016/j.msea.2026.150364 (Original work published 2026)