TY - JOUR
T1 - Mechanical properties of Fe-Al-Ta eutectic composites at higher solidification rates
AU - Cui, Chunjuan
AU - Wang, Yan
AU - Zhang, Kai
AU - Wu, Chongyang
AU - Liu, Wei
AU - Deng, Li
AU - Wang, Cong
AU - Su, Haijun
N1 - Publisher Copyright:
© 2021
PY - 2021/9/8
Y1 - 2021/9/8
N2 - As is known, solidification rate has an obvious effect on microstructure and property. Mechanical properties of Fe-Al-Ta eutectic composites at the solidification rates of 650 μm/s, 700 μm/s, 800 μm/s and 900 μm/s were studied in the present paper. Microhardness, tensile property and fracture toughness of Fe-Al-Ta eutectic composites at different solidification rates were studied respectively. Microhardness value of directionally solidified Fe-Al-Ta eutectic composites is significantly increased as compared with that of the as-cast alloy, and the relationship between microhardness and lamellar/rod spacing satisfies Hall-Petch Formula. There is no obvious plastic deformation characteristic during the process of tensile loading and the eutectic structure fracture is brittle fracture. In addition, the three-point bending fracture toughness is firstly increased then decreased with the increase of the solidification rate. When the solidification rate gets to 700 μm/s, the fracture model of Fe-Al-Ta eutectic composites is a cleavage-dimple mixed fracture, and the fracture toughness reaches the maximum value. The toughening mechanism can be ascribed to fine grain strengthening, crack deflection and interface enhancement.
AB - As is known, solidification rate has an obvious effect on microstructure and property. Mechanical properties of Fe-Al-Ta eutectic composites at the solidification rates of 650 μm/s, 700 μm/s, 800 μm/s and 900 μm/s were studied in the present paper. Microhardness, tensile property and fracture toughness of Fe-Al-Ta eutectic composites at different solidification rates were studied respectively. Microhardness value of directionally solidified Fe-Al-Ta eutectic composites is significantly increased as compared with that of the as-cast alloy, and the relationship between microhardness and lamellar/rod spacing satisfies Hall-Petch Formula. There is no obvious plastic deformation characteristic during the process of tensile loading and the eutectic structure fracture is brittle fracture. In addition, the three-point bending fracture toughness is firstly increased then decreased with the increase of the solidification rate. When the solidification rate gets to 700 μm/s, the fracture model of Fe-Al-Ta eutectic composites is a cleavage-dimple mixed fracture, and the fracture toughness reaches the maximum value. The toughening mechanism can be ascribed to fine grain strengthening, crack deflection and interface enhancement.
KW - Directional solidification
KW - Fe-Al-Ta eutectic composites
KW - Microhardness
KW - Tensile
KW - Three-point bending fracture
UR - http://www.scopus.com/inward/record.url?scp=85111338930&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2021.141765
DO - 10.1016/j.msea.2021.141765
M3 - 文章
AN - SCOPUS:85111338930
SN - 0921-5093
VL - 824
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
M1 - 141765
ER -