Structure and magnetic properties of Ni50-xCoxMn50-yAly (x=5-9, y=18-19) shape memory alloy ribbons
Dan, Nguyen Huy 1Hau, Kieu Xuan 1Yen, Nguyen Hai 1Thanh, Pham Thi 1Ngoc, Nguyen Huy 1Anh, Truong Viet 1Nga, Nguyen Thi Nguyet 2Anh, Do Thi Kim3
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作者信息
1. Vietnam Acad Sci & Technol
2. Hung Vuong Univ
3. Vietnam Natl Univ
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Abstract
Alloy ribbons of Ni50-xCoxMn50-yAly (x = 5, 6, 7, 8 and 9; y = 18 and 19) were fabricated by using melt-spinning method. By varying Co and Al concentrations, the formation of crystalline phases, structural transformations and magnetic phase transitions can be tuned as desired. With high Al and Co concentrations, only a ferromagnetic-paramagnetic (FM-PM) transition of the austenitic phase occurs in the range of 350-450 K. While there is an additional weak ferromagnetic-ferromagnetic (WFM-FM) transition corre-sponding to the martensitic-austenitic (M-A) structural transformation for the ribbons with low Al and Co concentrations. The M-A transformation temperature of the alloy ribbons can be obtained in the range of 150-360 K. An anomalous change in structure and magnetic properties was observed in the ribbon sample with Co and Al concentrations of 8 and 18 at%, respectively. The external magnetic field has a pronounced effect on the M-A transformation and tends to shift this process towards lower temperatures. (C) 2022 Elsevier B.V. All rights reserved.
NSTL
Elsevier