TY - JOUR
T1 - Microstructure and mechanical properties of Al-Fe-Sc-Zr alloy additively manufactured by selective laser melting
AU - Wang, Yueting
AU - Li, Ruidi
AU - Yuan, Tiechui
AU - Zou, Liang
AU - Wang, Minbo
AU - Yang, Haiou
N1 - Publisher Copyright:
© 2021
PY - 2021/10
Y1 - 2021/10
N2 - 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 α-Al grains; while the inside of molten pool presented eutectic of α-Al and Al6Fe/Al3(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/mm3. The current research results have a certain guiding significance for the composition design and microstructure control of additive manufacturing aluminum alloys.
AB - 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 α-Al grains; while the inside of molten pool presented eutectic of α-Al and Al6Fe/Al3(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/mm3. The current research results have a certain guiding significance for the composition design and microstructure control of additive manufacturing aluminum alloys.
KW - Al-Fe intermetallics
KW - Al-Fe-Sc-Zr
KW - Microstructure
KW - Selective laser melting
KW - Strengthening mechanism
UR - http://www.scopus.com/inward/record.url?scp=85113334152&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2021.111397
DO - 10.1016/j.matchar.2021.111397
M3 - 文章
AN - SCOPUS:85113334152
SN - 1044-5803
VL - 180
JO - Materials Characterization
JF - Materials Characterization
M1 - 111397
ER -