Metallurgical Abstracts on Light Metals and Alloys vol.55
Enhancement in strength and ductility of laser powder bed fused Al-12Si alloy by introducing nanoscale precipitates
Mulin Liu*, Naoki Takata*, Asuka Suzuki*, Makoto Kobashi* and Masaki Kato**
*Department of Materials Process Engineering, Graduate School of Engineering, Nagoya University
**Aichi Center for Industry and Science Technology
[Published in Additive Manufacturing Letters Vol. 1 (2021) 100008]
https://doi.org/10.1016/j.addlet.2021.100008
E-mail: takata.naoki[at]material.nagoya-u.ac.jp
Key Words: Laser powder bed fusion, Selective laser melting, Aluminum alloy, Strain hardening, Heat treatments
In order to manage both the strength and ductility of Al-Si alloys additively manufactured by laser powder bed fusion (L-PBF), an attempt was made to introduce nanoscale precipitates within the α-Al (fcc) supersaturated solid solution using the L-PBF manufactured Al-12%Si alloy by artificial aging treatments. The obvious hardening of the L-PBF manufactured Al-12Si alloy by the direct aging treatment (T5 treatment) at 120 °C. The direct aging treatment improved both the tensile strength and ductility (total elongation) of the L-PBF manufactured specimen. The simultaneous strength-ductility enhancement is due to the homogeneously distributed nanoscale Si precipitates that enhanced the strain hardening. These results provide new insights for overcoming the strength-ductility trade-off in the L-PBF manufactured Al alloys.
Simultaneous strength-ductility enhancement of L-PBF processed Al-12%Si alloy due to the homogeneously distributed nanoscale Si precipitates for enhancing the strain hardening.