Effects of heat treatment on microstructure and mechanical properties of LPBF AlSi9Cu3 alloy

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F26%3A0200835" target="_blank" >RIV/00216305:26210/26:0200835 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.prostr.2025.10.040" target="_blank" >http://dx.doi.org/10.1016/j.prostr.2025.10.040</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.prostr.2025.10.040" target="_blank" >10.1016/j.prostr.2025.10.040</a>

Result language
angličtina
Original language name
Effects of heat treatment on microstructure and mechanical properties of LPBF AlSi9Cu3 alloy
Original language description
This study examines the effects of various heat treatments on the microstructure and mechanical properties of the AlSi9Cu3 alloy produced by laser powder bed fusion technology. In addition to conventional T6 treatment, direct aging at 160 °C (T5 treatment) and annealing at 250 °C, 300 °C, and 350 °C were applied to evaluate thermal stability and precipitation behavior. The as-built microstructure, consisting of α-Al cells surrounded by a continuous network, remained stable up to 250 °C. At 300 °C, the network disintegrated, leading to a significant hardness reduction, resembling the behavior of LPBF AlSi10Mg alloy. The LPBF AlSi9Cu3 alloy in as-built state exhibited a yield strength of 270 MPa, tensile strength of 493 MPa, and elongation of 5.6 %. Direct aging at 160 °C for 10 h promoted precipitation inside α-Al cells and improved strength to 347 MPa (YS) and 520 MPa (UTS), with elongation slightly reduced to 3.9 %. T6 treatment, despite utilizing the precipitation potential of the alloy, did not surpass the strength achieved through direct ageing, underlining the dominant role of the original cellular microstructure.
Czech name
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Czech description
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Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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