AlMgScZr alloys for laser powder bed fusion additive manufacturing. A review
AlMgScZr alloys, such as Scalmalloy®, have shown great promise for laser powder bed fusion (LPBF) additive manufacturing, surpassing the limitations of many traditional aluminium alloys that are incompatible with this technology. LPBF-processed AlMgScZr alloys exhibited a unique microstructure compr...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525005003 |
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| Summary: | AlMgScZr alloys, such as Scalmalloy®, have shown great promise for laser powder bed fusion (LPBF) additive manufacturing, surpassing the limitations of many traditional aluminium alloys that are incompatible with this technology. LPBF-processed AlMgScZr alloys exhibited a unique microstructure comprising equiaxed and columnar grains and achieved isotropic high strength. Particularly important are the fine grain sizes and the precipitation hardening/pinning effects of Al3(Sc1-x,Zrx) nanoparticles. While Scalmalloy® demonstrated isotropic fatigue behaviour, other AlMgScZr alloys exhibited anisotropy due to fusion defects. Fatigue strength was improved with surface or heat treatments that induce compressive stresses and reduce surface roughness or internal defects.Localized corrosion in these alloys was closely linked to pores in the surface, the bimodal microstructure and the presence of precipitates. The formation of the β-phase (Al3Mg2) at ≈ 120–150 °C promoted intergranular and stress corrosion cracking.To fully realize the potential of AlMgScZr alloys, a deep understanding of the relationship between processing, microstructure, and properties is essential. Current research focuses on elucidating the formation and impact of precipitated phases on material properties. However, a more comprehensive evaluation of factors such as powder reuse, thermal impact on mechanical properties, and corrosion, is necessary to determine optimal applications and ensure reliability in demanding environments. |
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| ISSN: | 0264-1275 |