TY - JOUR
T1 - Microstructure evolution and mechanical property of melt-grown Al2O3/GdAlO3/ZrO2 eutectic ceramics prepared by laser directed energy deposition
AU - Liu, Haifang
AU - Jiang, Hao
AU - Shen, Zhonglin
AU - Chen, Qian
AU - Yu, Minghui
AU - Sui, Yudong
AU - Zhang, Xiaowei
AU - Liu, Hongxi
AU - Su, Haijun
N1 - Publisher Copyright:
© 2024 Elsevier Ltd and Techna Group S.r.l.
PY - 2024/7/1
Y1 - 2024/7/1
N2 - Highly dense Al2O3/GdAlO3/ZrO2 eutectic ceramics are one-step additively manufactured by laser directed energy deposition technique under different scanning speed to investigate the inherent response relationship between processing parameter, microstructure, and mechanical property. During the layer-wise deposition process, planar-cellular transition occurs near the bottom of the molten pool, leading to the transformation of irregular eutectic structure into eutectic colony structure lengthened along the building direction, accompanied by the refinement of microstructure dimension. With the increase of scanning speed, the eutectic spacing decreases, and the initially irregular “Chinese script” eutectic ultimately transforms into hexagonally arranged rod-like eutectic structure induced by lamellar instability. The rod spacing is 1.136 times larger than the lamellar spacing. The mechanical property of the laser 3D-printed Al2O3/GdAlO3/ZrO2 eutectic ceramic is manifested as isotropic. The hardness increases with the refinement of the microstructure, while the fracture toughness decreases as the eutectic morphology transforms into rod-like structure. The averaged hardness and fracture toughness are 16.27 GPa and 3.39 MPa‧m1/2, respectively.
AB - Highly dense Al2O3/GdAlO3/ZrO2 eutectic ceramics are one-step additively manufactured by laser directed energy deposition technique under different scanning speed to investigate the inherent response relationship between processing parameter, microstructure, and mechanical property. During the layer-wise deposition process, planar-cellular transition occurs near the bottom of the molten pool, leading to the transformation of irregular eutectic structure into eutectic colony structure lengthened along the building direction, accompanied by the refinement of microstructure dimension. With the increase of scanning speed, the eutectic spacing decreases, and the initially irregular “Chinese script” eutectic ultimately transforms into hexagonally arranged rod-like eutectic structure induced by lamellar instability. The rod spacing is 1.136 times larger than the lamellar spacing. The mechanical property of the laser 3D-printed Al2O3/GdAlO3/ZrO2 eutectic ceramic is manifested as isotropic. The hardness increases with the refinement of the microstructure, while the fracture toughness decreases as the eutectic morphology transforms into rod-like structure. The averaged hardness and fracture toughness are 16.27 GPa and 3.39 MPa‧m1/2, respectively.
KW - Additive manufacturing
KW - Laser directed energy deposition
KW - Mechanical property
KW - Microstructure evolution
KW - Oxide eutectic ceramic
UR - http://www.scopus.com/inward/record.url?scp=85189157820&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2024.03.358
DO - 10.1016/j.ceramint.2024.03.358
M3 - 文章
AN - SCOPUS:85189157820
SN - 0272-8842
VL - 50
SP - 22565
EP - 22573
JO - Ceramics International
JF - Ceramics International
IS - 13
ER -