Design of Al-Fe-Mn alloy for both high-temperature strength and sufficient processability of laser powder bed fusion

被引：30

作者：

Wang, Wenyuan ^{[1
]}

Takata, Naoki ^{[1
]}

Suzuki, Asuka ^{[1
]}

Kobashi, Makoto ^{[1
]}

Kato, Masaki ^{[2
]}

机构：

[1] Nagoya Univ, Grad Sch Engn, Dept Mat Proc Engn, Furo Cho,Chikusa Ku, Nagoya 4648603, Japan

[2] Aichi Ctr Ind & Sci Technol, 1267-1 Akiai,Yakusa Cho, Toyota 4700356, Japan

来源：

ADDITIVE MANUFACTURING | 2023年 / 68卷

关键词：

Additive manufacturing; Laser powder bed fusion; Thermodynamic calculation; Microstructure; High-temperature strength; MECHANICAL-PROPERTIES; MICROSTRUCTURE; MODE;

D O I：

10.1016/j.addma.2023.103524

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper presents a novel design concept for Al alloys with both sufficient laser powder bed fusion (L-PBF) processability and high-temperature mechanical performance using an Al-Fe-Mn ternary alloy with a refined alpha-Al/Al6M (M = Fe, Mn) two-phase microstructure. The near-eutectic (liquid -> alpha-Al(fcc) + Al6M) composition of Al-2.5Fe-2Mn (mass%) was designed to avoid the formation of coarse primary intermetallics (having a detrimental effect on the PBF processability for densification) based on non-equilibrium liquidus projection thermodynamic calculations. The designed Al-2.5Fe-2Mn alloy powder exhibited sufficient L-PBF processability, and fully dense centimeter-sized samples (relative densities of above 99%) were successfully prepared. The L-PBF Al-2.5Fe-2Mn alloy samples exhibited a significantly refined solidification microstructure consisting of Al6M and alpha-Al phases in the melt-pool regions. Fe and Mn alloying elements contributed to the formation of nanoscale Al6M-phase particles and a high solid solution concentration in the alpha-Al matrix. The strength of the L-PBF Al-2.5Fe-2Mn alloy was slightly reduced at higher temperatures, but remained above 240 MPa at an elevated temperature of 300 degrees C. This superior high-temperature mechanical performance was attributed to the high thermal stability of the refined alpha-Al/Al6M two-phase microstructure and the formation of nanosized Al6M-phase precipitates.

引用

页数：15

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