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Microstructure and mechanical properties evolution of a novel selective laser melted Al-Cu-Ni-Zr-Ti alloy during heat treatment
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DOI：10.1016/j.jallcom.2025.180355.png)
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Abstract
En 中文
This study presents the microstructure and mechanical properties of an additive manufactured Al-Cu-Ni-Zr-Ti alloy fabricated by selective laser melting (SLM). The microstructure evolution during heat treatment at elevated temperatures and its impact on the mechanical properties were also systematically investigated. Results showed that the as-built Al-Cu-Ni-Zr-Ti alloy exhibited a heterogeneous grain structure, which consisted of ultrafine equiaxed and columnar grains at the bottom and top of molten pool, respectively. The L12-Al3(Zr, Ti) phase tends to form within the grains, while the heat-resistant Al7Cu4Ni phase preferentially distributes along grain boundaries during the SLM process. As a result, the SLMed Al-Cu-Ni-Zr-Ti alloy, with these unique heterogeneous structures, displays high strength and good heat resistance. The yield strength and elongation of the as-built alloy were measured as 278 MPa and 7 %, respectively. When the alloy is exposed to 300 degrees C and 350 degrees C, the yield strength gradually improved with the time extended from 3 h to 200 h. Particularly, after exposure to 350 degrees C for 200 h, the yield strength reached 310.8 MPa, which is 12 % higher than the as-built condition (278.3 MPa). Microstructure observation revealed that the refined Al7Cu4Ni phase and grains exhibited good coarsening resistance during exposure at 300 degrees C and 350 degrees C, precipitation of nano-sized L12-Al3(Zr, Ti) and theta' phases provide additional strengthening. Therefore, the SLMed cost-effective Al-Cu-Ni-Zr-Ti alloy demonstrates promising suitability as a heat-resistant aluminum alloy within the 300-350 degrees C range, while its thermal resistance at temperatures up to 400 degrees C remains insufficient.
Keywords:
Additive Manufacturing
Selective laser melting
Al-Cu-Ni alloy
Al 7 Cu 4 Ni
Heat resistance
Journal
IF:
6.3
Papers:
8.3W
Citations:
24.3W