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Superelastic behavior of nanostructured Ti_(50)Ni_(48)Co_2 shape memory alloy with cold rolling processing

Transactions of Nonferrous Metals Society of China 2018年第7期28卷 1351-1359页

作者： E.MOHAMMAD SHARIFI a.kermanpur Department of Materials Engineering Malek Ashtar University of Technology Department of Materials Engineering Isfahan University of Technology

Effects of cold rolling followed by annealing on microstructural evolution and superelastic properties of the Ti50Ni48Co2 shape memory alloy were investigated. Results showed that during cold rolling, the alloy microstructure evolved through six basic stages including stress-induced martensite transformation and plastic deformation of martensite, deformation twinning, accumulation of dislocations along twin and variant boundaries in martensite, nanocrystallization, amorphization and reverse transformation of martensite to austenite. After annealing at 400 ℃ for 1 h, the amorphous phase formed in the cold-rolled specimens was completely crystallized and an entirely nanocrystalline structure was achieved. The value of stress level of the upper plateau in this nanocrystalline alloy was measured as high as 730 MPa which was significantly higher than that of the coarse-grained Ni50Ti50 and Ti50Ni48Co2 alloys. Moreover, the nanocrystalline Ti50Ni48Co2 alloy had a high damping capacity and considerable efficiency for energy storage.

关键词： shape memory alloy superelasticity nanocrystalline material thermomechanical processing

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Superelastic properties of nanocrystalline NiTi shape memory alloy produced by thermomechanical processing

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Transactions of Nonferrous Metals Society of China 2018年第3期28卷 515-523页

作者： E.MOHAMMAD SHARIFI a.kermanpur Department of Materials Engineering Malek Ashtar University of Technology Department of Materials Engineering Isfahan University of Technology

Effects of thermomechanical treatment of cold rolling followed by annealing on microstructure and superelastic behavior of the Ni50Ti50 shape memory alloy were *** specimens were produced by copper boat vacuum induction *** homogenized specimens were hot rolled and annealed at 900°***,annealed specimens were subjected to cold rolling with different thickness reductions up to 70%.Transmission electron microscopy revealed that the severe cold rolling led to the formation of a mixed microstructure consisting of nanocrystalline and amorphous phases in Ni50Ti50 *** annealing at 400°C for 1 h,the amorphous phase formed in the cold-rolled specimens was crystallized and a nanocrystalline structure *** showed that with increasing thickness reduction during cold rolling,the recoverable strain of Ni50Ti50 alloy was increased during superelastic experiments such that the 70%cold rolled-annealed specimen exhibited about 12%of recoverable ***,with increasing thickness reduction,the critical stress for stress-induced martensitic transformation was *** is noteworthy that in the 70%cold rolled-annealed specimen,the damping capacity was measured to be 28 J/cm3 that is significantly higher than that of commercial NiTi alloys.

关键词： nanocrystalline material shape memory alloy superelasticity thermomechanical processing

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维普期刊数据库

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Development of a New Ultrafine/Nano Ferrite-Carbide Microstructure by Thermomechanical Processing

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Acta Metallurgica Sinica(English Letters) 2015年第2期28卷 249-253页

作者： Yousef Mazaheri Ahmad kermanpur Abbas Najafizadeh Navid Saeidi Department of Materials Engineering Isfahan University of Technology

The steel with the new microstructure, bimodal submicrometer equiaxed ferrite grains with uniformly dis- tributed nanosized cementite particles, was manufactured by a new approach utilizing simple cold-rolling and subsequent annealing of a dual phase ferrite-martensite starting structure. The mean ferrite grain size and carbide size range of the specimen after 80% cold-rolling and subsequent annealing at 600 ℃ for 20 min were 0.35 μm and 70-140 nm, respec- tively. A combination of bimodal ultrafine ferrite and nanoscale carbides used as a more effective method for achieving an excellent balance in strength-ductility. The strength of the steel with the new microstructure increased to about 880 MPa （nearly 60% higher than that of the as-received state, e.g., 540 MPa）, without significant loss of ductility.

关键词： Low-carbon steel Dilatometry Thermomechanical processing Grain refinement Mechanical properties

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