Journal
MATERIALS CHARACTERIZATION
Volume 189, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2022.111977
Keywords
Al alloy; Laser powder bed fusion; Sc; Heat treatment; Corrosion; Mechanical property
Categories
Funding
- National Natural Science Foundation of China [51871184, 51961013]
- Natural Science Foundation of Jiangxi Province of China [20202ACBL214002, 2021BCJL22042]
- China Postdoctoral Science Foundation [2019M660159, 2020T130093]
- The cultivation project of the State key Laboratory of Green Development and High-value Utilization of Ionic Rare Earth Resources in Jiangxi Province [20194AFD44003]
- Postdoctoral Science Foundation of Jiangxi Province [2019KY25]
- Program of Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology [JXUSTQJYX2020022]
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An ultrafine grained Al-Mg-Sc-Mn-Zr alloy fabricated by L-PBF showed improved mechanical properties and corrosion resistance through optimized annealing heat treatment, mainly attributed to the formation of sub-nano sized Al-3(Sc, Zr) precipitates.
An ultrafine grained Al-Mg-Sc-Mn-Zr alloy fabricated by laser powder bed fusion (L-PBF) was prepared to investigate the effect of different annealing heat treatments on the mechanical properties and corrosion behaviors. The results show that the optimized heat treatment is determined to be annealing at 300 degrees C for 2 h, which achieves highest hardness (142 HV) and best corrosion resistance (6.2 mu A/cm(2)) simultaneously. The improvement of the mechanical properties and the corrosion resistance is mainly attributed to the precipitation of the secondary Al-3(Sc, Zr) precipitates with sub-nano size. Moreover, the size of the nanoscale Al-3(Sc, Zr) precipitates and the micropores also play a role in the corrosion resistance of the L-PBF Al-Mg-Sc-Mn-Zr alloy
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