期刊
MATERIALS CHARACTERIZATION
卷 180, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2021.111397
关键词
Selective laser melting; Al-Fe-Sc-Zr; Microstructure; Al-Fe intermetallics; Strengthening mechanism
类别
资金
- National Key Research and Development Program of China [2017YFB0306305]
- National Natural Science Foundation of China [51871249]
- Hunan Key RD Plan [2020WK2027]
- Shenzhen Science and Technology Plan [JCYJ20180508151903646]
- Hunan Science Fund for Distinguished Young Scholars [2020JJ2046]
- Huxiang Young Talents [2018RS3007]
- Natural Science Foundation of Shandong Province [ZR2020ZD04]
- Fund of Thestate Key Laboratory of Solidification Pro-cessing in NWPU [SKLSP202109]
A specially designed Al-Fe-Sc-Zr alloy for selective laser melting (SLM) additive manufacturing was studied, showing high density, bimodal grain structure, and excellent tensile strength at optimized printing parameters.
An Al-5Fe-1Mg-0.8Sc-0.7Zr (wt%) alloy was specifically designed for selective laser melting (SLM) additive manufacturing and atomized powder prepared. The design of this non-equilibrium alloy is based on: first, solid solubility of Fe element in Al alloy can be significantly enlarged during laser rapid solidification; second, Sc and Zr elements are used to refine the microstructure so as to prevent micro-crack and improve strength. At an optimized printing parameters, the SLM printed Al-Fe-Sc-Zr samples exhibited a highest density of 99.2% with rare intergranular cracks. Besides, a bimodal grain structure was observed, consisting of ultrafine equiaxed grain at molten pool boundary and coarse columnar grain inside the molten pool. At the boundary of molten pool, many intermetallic particles (Al6Fe and Al13Fe4) appeared around supersaturated alpha-Al grains; while the inside of molten pool presented eutectic of a-Al and Al6Fe/Al-3(Sc, Zr). Interestingly, a large number of stacking faults were observed around the precipitated particles by HRTEM, which are also conducive to strengthening of SLM printed Al-Fe-Sc-Zr sample. Thus, excellent tensile strength of 489 MPa was obtained at an optimized volumetric energy density (VED) of 70 J/mm(3). The current research results have a certain guiding significance for the composition design and microstructure control of additive manufacturing aluminum alloys.
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