TY - JOUR
T1 - Manufacturing of a nanosized TiB strengthened Ti-based alloy via electron beam powder bed fusion
AU - Cui, Yujie
AU - Aoyagi, Kenta
AU - Zhao, Yufan
AU - Yamanaka, Kenta
AU - Hayasaka, Yuichiro
AU - Koizumi, Yuichiro
AU - Fujieda, Tadashi
AU - Chiba, Akihiko
N1 - Funding Information:
This study was partially funded by the “Creation of Life Innovation Materials for Interdisciplinary and International Researcher Development” from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. .
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/12
Y1 - 2020/12
N2 - We manufactured a Ti-based alloy via electron beam powder bed fusion (PBF-EB) and systematically investigated its microstructure and mechanical properties. We compared its properties with those of a conventionally forged alloy via electron backscattered diffraction, high-angle annular dark-field scanning transmission electron microscopy observations, and tensile tests. The formation mechanism, orientation relationship with the matrix, and crystal structures of the nanosized TiB particles were verified. The formation of nanosized TiB particles was mainly attributed to high cooling rates during PBF-EB manufacturing. In addition, the segregation of the solute Zr and Si atoms into the α-phase/TiB interface restricted TiB precipitate growth, which contributed to the formation of fine TiB particles in the alloy manufactured via PBF-EB. The orientation relationships between the TiB particles and α-phase in the PBF-EB-manufactured alloy are different from those in the hot-forged alloy. Moreover, for the first time, the simultaneous existence of the B27 and twinned B27 structures was verified in the nanosized TiB particles. Our study provides general guidelines for the manufacturing of materials strengthened by refined precipitates using PBF-EB or other additive manufacturing methods.
AB - We manufactured a Ti-based alloy via electron beam powder bed fusion (PBF-EB) and systematically investigated its microstructure and mechanical properties. We compared its properties with those of a conventionally forged alloy via electron backscattered diffraction, high-angle annular dark-field scanning transmission electron microscopy observations, and tensile tests. The formation mechanism, orientation relationship with the matrix, and crystal structures of the nanosized TiB particles were verified. The formation of nanosized TiB particles was mainly attributed to high cooling rates during PBF-EB manufacturing. In addition, the segregation of the solute Zr and Si atoms into the α-phase/TiB interface restricted TiB precipitate growth, which contributed to the formation of fine TiB particles in the alloy manufactured via PBF-EB. The orientation relationships between the TiB particles and α-phase in the PBF-EB-manufactured alloy are different from those in the hot-forged alloy. Moreover, for the first time, the simultaneous existence of the B27 and twinned B27 structures was verified in the nanosized TiB particles. Our study provides general guidelines for the manufacturing of materials strengthened by refined precipitates using PBF-EB or other additive manufacturing methods.
KW - Additive manufacturing
KW - Mechanical properties
KW - Nucleation
KW - Precipitate
KW - Titanium alloy
UR - http://www.scopus.com/inward/record.url?scp=85088904515&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85088904515&partnerID=8YFLogxK
U2 - 10.1016/j.addma.2020.101472
DO - 10.1016/j.addma.2020.101472
M3 - Article
AN - SCOPUS:85088904515
SN - 2214-8604
VL - 36
JO - Additive Manufacturing
JF - Additive Manufacturing
M1 - 101472
ER -