TY - JOUR
T1 - Zirconium modified Nb-22Ti-16Si alloys fabricated by laser additive manufacturing
T2 - Microstructure and fracture toughness
AU - Li, Yunlong
AU - Lin, Xin
AU - Hu, Yunlong
AU - Kang, Nan
AU - Gao, Xuehao
AU - Dong, Hongbiao
AU - Huang, Weidong
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2019/4/30
Y1 - 2019/4/30
N2 - The microstructure and mechanical behavior of Nb-22Ti-16Si-xZr alloys (x = 0, 1, 5, 10, 15 at.%) were investigated by using laser solid forming (LSF) additive manufacturing from elemental powder mixture of Nb, Ti, Si and Zr. The as-deposited Nb-22Ti-16Si alloy presented a microstructure consisted of primary Nb-base solid solution (Nbss) dendrite and Nbss/(Nb)3Si eutectic dendrites. The eutectic Nbss/γ-(Nb)5Si3 appeared with a morphology of lamellar structural feature when 1 at.%Zr was added, and its content increased with Zr content. Nbss/(Nb)3Si eutectic dendrites disappeared when Zr content reaches 10 at.%. Further increasing of Zr (15 at.%) result in the appearance of a hypereutectic microstructure, which consisted by primary γ-(Nb)5Si3 and eutectic Nbss/γ-(Nb)5Si3. As the nominal Zr content increased, the fracture toughness of LSFed Nb-22Ti-16Si-xZr alloy increases first and reaches the maximum value (15.28 MPa m1/2) in LSFed Nb-22Ti-16Si-5Zr alloy, and then decreases.
AB - The microstructure and mechanical behavior of Nb-22Ti-16Si-xZr alloys (x = 0, 1, 5, 10, 15 at.%) were investigated by using laser solid forming (LSF) additive manufacturing from elemental powder mixture of Nb, Ti, Si and Zr. The as-deposited Nb-22Ti-16Si alloy presented a microstructure consisted of primary Nb-base solid solution (Nbss) dendrite and Nbss/(Nb)3Si eutectic dendrites. The eutectic Nbss/γ-(Nb)5Si3 appeared with a morphology of lamellar structural feature when 1 at.%Zr was added, and its content increased with Zr content. Nbss/(Nb)3Si eutectic dendrites disappeared when Zr content reaches 10 at.%. Further increasing of Zr (15 at.%) result in the appearance of a hypereutectic microstructure, which consisted by primary γ-(Nb)5Si3 and eutectic Nbss/γ-(Nb)5Si3. As the nominal Zr content increased, the fracture toughness of LSFed Nb-22Ti-16Si-xZr alloy increases first and reaches the maximum value (15.28 MPa m1/2) in LSFed Nb-22Ti-16Si-5Zr alloy, and then decreases.
KW - Fracture toughness
KW - Laser additive manufacturing
KW - Microstructure
KW - Nb-Si alloys
KW - Powder mixture
UR - http://www.scopus.com/inward/record.url?scp=85059115800&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2018.12.280
DO - 10.1016/j.jallcom.2018.12.280
M3 - 文章
AN - SCOPUS:85059115800
SN - 0925-8388
VL - 783
SP - 66
EP - 76
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -