Characterizations of micro-nano structure and tensile properties of a Sc modified Al-Mn alloy fabricated by selective laser melting

被引：17
作者：
Lu, Jinglin [1 ,2 ]
Lin, Xin [1 ,2 ]
Kang, Nan [1 ,2 ]
Huang, Weidong [1 ,2 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
[2] Northwestern Polytech Univ, MIIT China, Key Lab Met High Performance Addit Mfg & Innovat, Xian 710072, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2021年 / 178卷 / 178期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
Selective laser melting; Al-Mn alloy; Aging treatment; Microstructure; Tensile properties; ALUMINUM-ALLOYS; MICROSTRUCTURE EVOLUTION; MECHANICAL-PROPERTIES; ELEVATED-TEMPERATURE; PRECIPITATION; STRENGTH; PHASE; HOMOGENIZATION; TRANSITION; BEHAVIOR;
D O I：
10.1016/j.matchar.2021.111305
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work, bulk deposits of a Sc modified Al-Mn-Fe-Si alloy were prepared by selective laser melting (SLM), and the microstructural characteristics and tensile properties of the deposits were analyzed. The as-deposited sample presented a multiscale microstructure consisting of epitaxial columnar grains with width of 30-140 mu m, in which there exist alpha-Al dendrite arrays with average primary dendrite arm spacing of 0.34 mu m, and interdendritic nanoscale alpha-Al + Al6(Mn,Fe) divorced eutectic. After an aging treatment, Al6(Mn,Fe) transformed into Al12(Mn, Fe)3Si, and its morphology gradually evolved from skeleton into particle. Meanwhile, needle-like AlMnSi precipitated and grew up in the alpha-Al dendrite trunk. The ultimate tensile strength increased from 349 +/- 9 MPa in the as-deposited state to 430 +/- 3 MPa after aging at 300 degrees C. However, it dropped to 358 +/- 1 MPa when the aging temperature increased to 350 degrees C. The addition of Sc caused precipitation strengthening of secondary Al3Sc after aging treatment, but the grain refinement effect of primary Al3Sc was inhibited since Sc tended to segregate at the frontier of the Mn-containing pre-precipitates.
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页数：14
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