TY - JOUR
T1 - Unveiling solid-state transformation toughening mechanism of yttria stabilized zirconia on brazed joint by in-situ observation
AU - Nai, Xin
AU - Wang, Peng
AU - Zhao, Shuai
AU - Chen, Haiyan
AU - Wang, Pengcheng
AU - Song, Xiaoguo
AU - Vairis, Achilles
AU - Li, Wenya
N1 - Publisher Copyright:
© 2024 The Society of Manufacturing Engineers
PY - 2024/10/15
Y1 - 2024/10/15
N2 - Yttria stabilized zirconia (YSZ) has proved to be the most promising strengthening particles in the composite filler to release the residual stress of Ti3SiC2/Cu brazed joint. However, like most of ceramic/metal brazed joints, the microstructural evolution during the serving process was hardly to be characterized directly, limited to the conventional techniques and their brittleness. Therefore, the solid-state transformation toughening mechanism of YSZ on Ti3SiC2/Cu brazed joint during the service process is still unclear. In this study, Ti3SiC2/Cu brazed joints were fabricated by 10 vol% 3YSZ-40 vol% Ti25Zr25Ni25Cu25-Ag and 50 vol% Ti25Zr25Ni25Cu25-Ag fillers respectively, and the influence of YSZ on microstructural evolution of Ti3SiC2/Cu brazed joints was investigated by in-situ three-point bending experiment for the first time. Combined with the transmission Kikuchi diffraction and transmission electron microscopy results, two kinds of toughening mechanism models were proposed. During the loading process, the solid-state transformation from tetragonal zirconia to monoclinic zirconia occurred, contributing to volume expansion. The volume expansion of particles at interface of reaction layer/brazing seam inhibited the propagation of secondary microcracks. While the volume expansion of particles near the prime crack induced microcracks, retarding the propagation of prime crack. As a result, the main crack in the joint brazed by 10 vol% 3YSZ composite filler occurred and propagated throughout the interface, instead of concentration on the ceramic side in the 3YSZ-free brazed joint, where the maximum bending force was only about 250 MPa, just 66.75 % of that of brazed joint containing 3YSZ particles. This study provides new methods to analyze fracture behaviors of brazed joint during its service process and proves the promising prospect of YSZ as toughening method in the brazed joints.
AB - Yttria stabilized zirconia (YSZ) has proved to be the most promising strengthening particles in the composite filler to release the residual stress of Ti3SiC2/Cu brazed joint. However, like most of ceramic/metal brazed joints, the microstructural evolution during the serving process was hardly to be characterized directly, limited to the conventional techniques and their brittleness. Therefore, the solid-state transformation toughening mechanism of YSZ on Ti3SiC2/Cu brazed joint during the service process is still unclear. In this study, Ti3SiC2/Cu brazed joints were fabricated by 10 vol% 3YSZ-40 vol% Ti25Zr25Ni25Cu25-Ag and 50 vol% Ti25Zr25Ni25Cu25-Ag fillers respectively, and the influence of YSZ on microstructural evolution of Ti3SiC2/Cu brazed joints was investigated by in-situ three-point bending experiment for the first time. Combined with the transmission Kikuchi diffraction and transmission electron microscopy results, two kinds of toughening mechanism models were proposed. During the loading process, the solid-state transformation from tetragonal zirconia to monoclinic zirconia occurred, contributing to volume expansion. The volume expansion of particles at interface of reaction layer/brazing seam inhibited the propagation of secondary microcracks. While the volume expansion of particles near the prime crack induced microcracks, retarding the propagation of prime crack. As a result, the main crack in the joint brazed by 10 vol% 3YSZ composite filler occurred and propagated throughout the interface, instead of concentration on the ceramic side in the 3YSZ-free brazed joint, where the maximum bending force was only about 250 MPa, just 66.75 % of that of brazed joint containing 3YSZ particles. This study provides new methods to analyze fracture behaviors of brazed joint during its service process and proves the promising prospect of YSZ as toughening method in the brazed joints.
KW - Brazing
KW - Ceramics
KW - In-situ bending test
KW - Martensitic phase transformation
KW - Transmission electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=85200226458&partnerID=8YFLogxK
U2 - 10.1016/j.jmapro.2024.08.002
DO - 10.1016/j.jmapro.2024.08.002
M3 - 文章
AN - SCOPUS:85200226458
SN - 1526-6125
VL - 127
SP - 211
EP - 217
JO - Journal of Manufacturing Processes
JF - Journal of Manufacturing Processes
ER -