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논문 기본 정보

자료유형
학술저널
저자정보
Swadhin Kumar Patel (National Institute of Technology Rourkela) Ajit Behera (National Institute of Technology Rourkela)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.11
발행연도
2022.11
수록면
2,691 - 2,705 (15page)
DOI
10.1007/s12540-021-01166-5

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NITINOL is the most popular and economic shape memory alloy (SMA) used in various industries. For temperature associatedapplications, the shape memory effect (SME) is the major phenomenon for the shape and strain recovery of materialsafter deformation. The machinability and cold working ability of NiTi alloys are poor compared to conventional alloys. Soto reduce the post-processing of the finished product with good homogenization of elements, the powder technology routeis suitable for making these SMAs. Due to the simplicity and cost-effectiveness, the uniaxial press and sinter process wasused for pellet making. In this paper, before sintering 450, 475, 500, 525, 550, 575 and 600 MPa compaction pressures wereanalysed by their green densities and 600 MPa compacted pellet yielded the better density. Sintering was done at 950, 1000,1050, 1100 and 1150 °C with the variation of sintering time 0.5, 1, 1.5 and 2 h. The XRD and SEM studies showed thatsamples sintered at 950 °C have oxide phases with elemental Ni and Ni3Tiphases. For samples sintered at 1000, 1050 and1100 °C, NiTi and Ti2Niformed as major phases with minor phases of βTi and Ni4Ti3precipitates formed inside the NiTimatrix. It was difficult to detect the minor phases for the sample sintered at 1150 °C. Needle shaped martensitic NiTi formsinside the austenitic NiTi matrix and was detected at a very high magnification of 5000× in SEM. From the DifferentialScanning Calorimetry study, it was found that an increase in sintering time and sintering temperature results in a faster shapememory response.

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