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- W2898032882 abstract "Abstract This study aims to determine an effective microstructure unit that controls the strength and fracture toughness of TC21 alloy with multi-level lamellar microstructure, including original β grain, α colony, and α plate. The multi-level lamellar microstructure of TC21 alloy, which was prepared by solution treatment at 980 °C and annealed temperature ranging from 720 °C to 820 °C, was characterized using scanning electron microscopy, electron backscatter diffraction, optical microscopy, and image analysis software. The relationship between multi-level microstructure and strength and fracture toughness was discussed using the Hall–Petch formula. Results show that the sizes of α colony (dc) and α plate (dα) increase gradually with the annealing temperature. Although the sizes of α colonies and α plates obey the Hall–Petch relationship with respect to strength, the distribution of points between d α − 1 / 2 and strength is rather dispersed than d c − 1 / 2 . Thus, α colony is the effective controlling unit of strength of the alloy. Meanwhile, α plate is the effective microstructure unit for controlling fracture toughness. It is confirmed by EBSD that the fracture toughness depends on the bending, rotation and shearing of α plate during the crack propagation. Moreover, an intensity relationship exists for the crack growth resistance with the increasing size of α colony, which cause rough propagation path by shearing amount of α plates and result in high toughness with increasing annealing temperature, thereby providing the reasonable evidence that α plates is the effective control unit of fracture toughness." @default.
- W2898032882 created "2018-10-26" @default.
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- W2898032882 date "2019-01-01" @default.
- W2898032882 modified "2023-10-17" @default.
- W2898032882 title "Strength and fracture toughness of TC21 alloy with multi-level lamellar microstructure" @default.
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- W2898032882 doi "https://doi.org/10.1016/j.msea.2018.10.056" @default.
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