首页|(162852)Enhancing mechanical properties of the boron doped Al_(0.2)Co_(1.5)CrFeNi_(1.5)Ti_(0.5) high entropy alloy via tuning composition and microstructure
(162852)Enhancing mechanical properties of the boron doped Al_(0.2)Co_(1.5)CrFeNi_(1.5)Ti_(0.5) high entropy alloy via tuning composition and microstructure
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NSTL
Elsevier
High entropy alloys (HEAs) have attracted considerable attention due to their excellent mechanical properties, which provides new insights for designing next generation structural materials. A series of Al_(0.2)Co_(1.5)CrFeNi_(1.5)Ti_(0.5)B_x (x = 0, 0.15, 0.3, 0.45, 0.6, 0.75 and 0.9, in molar ratio) HEAs was prepared by vacuum arc melting to investigate the effect of boron doping on the phase evolution, microstructure transformation and mechanical properties. The results indicated that the HEAs with trace boron doping (x = 0.15) maintained single FCC phase, while it evolved to FCC phase, in-situ borides (TiB_2 and Cr_2B) and Laves phase when the boron molar ratio higher than 0.3. With the boron molar content increased from 0 to 0.9, the microstructures of the HEAs transformed from complete dendrite to dendrites, irregularly shaped TiB_2, needle-shaped Cr_2B and lamellar eutectic structure which composed by alternate layers of FCC phase and Laves phase. B doping improved the strength and hardness of the HEAs. The enhanced mechanical properties of the boron doped HEAs was attributed to the synergistic strengthening effect among interstitial solid solution strengthening, second phase strengthening, dislocation strengthening, fine grain strengthening and heterostructure strengthening.
High entropy alloyBoron dopingEutecticMechanical property
Benbin Xin、Aijun Zhang、Jiesheng Han
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Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China
NSTL
Elsevier
