TY - JOUR
T1 - Formation mechanism and thermal stability of γ' and γ" compact co-precipitated nanostructure in directed energy deposited Ni-based alloy
AU - Dang, Mingji
AU - Yu, Jun
AU - Lin, Xin
AU - Chai, Haozhi
AU - Ding, Hanlin
AU - Tan, Hua
AU - Huang, Weidong
N1 - Publisher Copyright:
© 2022 Elsevier Inc.
PY - 2022/12
Y1 - 2022/12
N2 - In order to understand the formation mechanism of a special nanostructure of γ' and γ" co-precipitated phase which present an important potential in the improvement of high thermal stability, strength and ductility in the superalloy, the influence of the atomic ratio of (Al+Ti)/Nb on the microstructures of the Ni-Cr-Al-Ti-Nb alloys has been investigated using laser directed energy deposition (DED). As the ratio of (Al+Ti)/Nb increases in the as-deposited and heat-treated alloy, the precipitation ability of γ' phase in the alloy is improved, accompanied with a reduction in the precipitation of γ" phase. When this ratio reaches 1.5 with the alloy composition of Ni-13.5Cr-5.26Al-1.95Ti-4.8Nb (at.%), the γ' and γ" co-precipitated nanostructure with the pattern of γ" phase attaching to six surfaces of the cubic γ' phase is generally produced in the as-deposited and heat-treated alloy. Furthermore, it was revealed that Ti element has the critical effect on the formation of this compact co-precipitated nanostructure.
AB - In order to understand the formation mechanism of a special nanostructure of γ' and γ" co-precipitated phase which present an important potential in the improvement of high thermal stability, strength and ductility in the superalloy, the influence of the atomic ratio of (Al+Ti)/Nb on the microstructures of the Ni-Cr-Al-Ti-Nb alloys has been investigated using laser directed energy deposition (DED). As the ratio of (Al+Ti)/Nb increases in the as-deposited and heat-treated alloy, the precipitation ability of γ' phase in the alloy is improved, accompanied with a reduction in the precipitation of γ" phase. When this ratio reaches 1.5 with the alloy composition of Ni-13.5Cr-5.26Al-1.95Ti-4.8Nb (at.%), the γ' and γ" co-precipitated nanostructure with the pattern of γ" phase attaching to six surfaces of the cubic γ' phase is generally produced in the as-deposited and heat-treated alloy. Furthermore, it was revealed that Ti element has the critical effect on the formation of this compact co-precipitated nanostructure.
KW - Compact co-precipitated nanostructure
KW - Directed energy deposited
KW - Nickel-based superalloy
KW - γ' and γ" phase
UR - http://www.scopus.com/inward/record.url?scp=85141543490&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2022.112450
DO - 10.1016/j.matchar.2022.112450
M3 - 文章
AN - SCOPUS:85141543490
SN - 1044-5803
VL - 194
JO - Materials Characterization
JF - Materials Characterization
M1 - 112450
ER -