Microstructure, mechanical performance, and corrosion behavior of additively manufactured aluminum alloy 5083 with 0.7 and 1.0 wt% Zr addition

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:823

Article

Zhou, Le^1,2  Hyer, Holden^1,3  Chang, Jinfa^1,4  Mehta, Abhishek¹  Huynh, Thinh¹  Yang, Yang^1,4,5  Sohn, Yongho¹ 

[1] Univ Cent Florida, Dept Mat Sci & Engn, Orlando, FL 32816 USA

[2] Marquette Univ, Dept Mech Engn, Milwaukee, MI USA

[3] Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN USA

[4] Univ Cent Florida, NanoSci Technol Ctr, Orlando, FL 32816 USA

[5] Univ Cent Florida, Dept Chem, Renewable Energy & Chem Transformat Cluster, Orlando, FL 32816 USA

关键词: AA5083;    Laser powder bed fusion;    Electron microscopy;    Linear polarization;    Electrical impedance spectroscopy;    Tensile properties;   

DOI  :  10.1016/j.msea.2021.141679

来源: Elsevier

【 摘 要 】

Effect of 0.7 wt% and 1.0 wt% of Zr alloying on the laser powder bed fused (LPBF) printability/buildability of AA5083 alloys was investigated by examination of the microstructure and mechanical property. General corrosion behavior of these Zr-modified AA5083 alloys produced by LPBF in 3.5 wt% NaCl solution was also examined and compared to the LPBF AlSi10Mg alloy and AA5083-H131 alloy. Unmodified AA5083 alloy produced by LPBF exhibited extensive solidification cracks, but alloying it with Zr mitigated the cracking due to the grain refinement from the formation of the primary L12-Al3Zr. Moreover, 1.0 wt% of Zr alloying broadened the LPBF processing window compared to the 0.7 wt% of Zr alloying. This slightly higher Zr alloying content also increased the yield strength and enhanced the age-hardening behavior of the LPBF Zr-modified AA5083 alloy. Transmission electron microscopy verified the primary Al3Zr in the as-built alloys responsible for grain refinement, and the secondary Al3Zr after aging for precipitation hardening. The corrosion resistance of both LPBF Zrmodified AA5083 alloys was superior to the LPBF AlSi10Mg and wrought AA5083 alloys, as evidenced by the smaller corrosion current density, larger impedance, and less corroded surface after 168 h of immersion. Minor Zr alloying to AA5083 is an effective approach for designing corrosion-resistant aluminum alloys suitable for LPBF additive manufacturing technology.

【 授权许可】

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