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- W4361028267 abstract "This paper reported the superelasticity and excellent cycle stability of boron-microalloyed Co–V–Al–Fe shape memory alloy. The microstructures, martensitic transformation characteristics, shape memory effect, and superelastic properties of Co56+xV32-xAl12 (x = 0, 2, 4, 6), Co58-xFexV30Al12 (x = 2, 4, 5), and (Co53Fe5V30Al12)100-xBx (x = 0.1, 0.5, 1) alloys were studied. The martensitic transformation temperature decreases with the decrease of Co content in Co56+xV32-xAl12 (x = 0, 2, 4, 6) alloys. The Co58V30Al12 obtained the entirely recovered about 1.2% residual strain after 3% pre-strain. With the increased Fe content, the martensitic transformation temperature of Co58-xFexV30Al12 (x = 2, 4, 5) alloys decreases significantly, and a Co53Fe5V30Al12 alloy with Ms and Af as 233.1K and 260.1K is obtained. The results show that without the B addition, the Co53Fe5V30Al12 alloy only exhibits 13 superelastic cycles when applying the pre-strain of 3% at room temperature. When the microalloying of B is 0.5 at.%, the martensitic transformation temperature is slightly increased with Ms and Af at 241.0K and 268.5K, and the thermal hysteresis (7.3K) is almost unchanged. The grain size of the alloy is significantly refined due to the precipitation of VB compounds. As a result, the mechanical and superelastic properties are improved in (Co53Fe5V30Al12)99.5B0.5 alloy. During more than 5100 superelastic cycles with the pre-strain of 3% at room temperature, the (Co53Fe5V30Al12)99.5B0.5 alloy shows excellent cycle stability. It may provide essential guiding significance for developing Co-based shape memory alloys." @default.
- W4361028267 created "2023-03-30" @default.
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- W4361028267 date "2023-06-01" @default.
- W4361028267 modified "2023-10-18" @default.
- W4361028267 title "Development of boron-microalloyed Co–V–Al–Fe shape memory alloys" @default.
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- W4361028267 doi "https://doi.org/10.1016/j.intermet.2023.107889" @default.
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