TY - JOUR
T1 - High fatigue performance and microscopic mechanisms of in-situ TiB2/7050Al composite at different temperatures
AU - Ma, Liufang
AU - Luo, Xian
AU - Wang, Hong
AU - Hu, Rui
AU - Yi, Xiaowei
AU - Zhou, Chaoxian
AU - Chen, Wei
AU - Ran, Gang
N1 - Publisher Copyright:
© 2024 Elsevier Ltd
PY - 2024/8
Y1 - 2024/8
N2 - In this work, the fatigue properties of in-situ TiB2 particle-reinforced 7050 Al-matrix (TiB2/7050Al) composites at room temperature (RM), 100 ℃ and 150 ℃ were studied, respectively, and the microstructure changes, fatigue fracture characteristics and fracture mechanism were analyzed. The results indicate that when the fatigue temperature increased, the amount of S phase precipitation along grain boundaries increases, forming a banded distribution with TiB2 particles near the grain boundary regions. The RM fatigue limit of the composite is high up to 307.5 MPa. Under the same fatigue strength, TiB2/7050 composites can withstand fatigue cycles far greater than 7050Al alloy. With the increase of temperature, the fatigue performance of the composite gradually decreased, and unlike at RM and 100 ℃, the use of Weibull three-parameter model is necessary to obtain a satisfactory S-N curve at 150 ℃. In some locations of the steady-state crack propagation stage, the direction and spacing of fatigue striations were influenced by grain orientation, grain boundaries and TiB2 particle bands. Therefore, the effects of TiB2 particles, grain boundaries, and precipitations on the fatigue processes were analyzed to reveal the strengthening mechanisms of the composite.
AB - In this work, the fatigue properties of in-situ TiB2 particle-reinforced 7050 Al-matrix (TiB2/7050Al) composites at room temperature (RM), 100 ℃ and 150 ℃ were studied, respectively, and the microstructure changes, fatigue fracture characteristics and fracture mechanism were analyzed. The results indicate that when the fatigue temperature increased, the amount of S phase precipitation along grain boundaries increases, forming a banded distribution with TiB2 particles near the grain boundary regions. The RM fatigue limit of the composite is high up to 307.5 MPa. Under the same fatigue strength, TiB2/7050 composites can withstand fatigue cycles far greater than 7050Al alloy. With the increase of temperature, the fatigue performance of the composite gradually decreased, and unlike at RM and 100 ℃, the use of Weibull three-parameter model is necessary to obtain a satisfactory S-N curve at 150 ℃. In some locations of the steady-state crack propagation stage, the direction and spacing of fatigue striations were influenced by grain orientation, grain boundaries and TiB2 particle bands. Therefore, the effects of TiB2 particles, grain boundaries, and precipitations on the fatigue processes were analyzed to reveal the strengthening mechanisms of the composite.
KW - Al-matrix composite
KW - Crack initiation and propagation
KW - Fatigue fracture
KW - High temperature fatigue performance
KW - TiB particle
UR - http://www.scopus.com/inward/record.url?scp=85192066498&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2024.108372
DO - 10.1016/j.ijfatigue.2024.108372
M3 - 文章
AN - SCOPUS:85192066498
SN - 0142-1123
VL - 185
JO - International Journal of Fatigue
JF - International Journal of Fatigue
M1 - 108372
ER -