Magnetic properties of the Heusler alloy Co2TiAl synthesized by melt-spinning technique
Wei ZhangLei ZhaoZhengnan QianYu SuiYuqiang LiuWenhui SuMing ZhangZhuhong LiuGuodong LiuGuangheng Wu
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Melt spinning
Ribbon
Magnetic shape-memory alloy
Abstract Melt spinner has been used for fabrication of Ni3Al alloy (Ni-12.5 wt.% Al) ribbon. The optimal speed of wheel during melt spinning was 20.5 m s−1. The thickness of the ribbon was between 14 and 60 μm and width 2 mm. During melt spinning some powder appeared as a by-product, dependent on the speed of copper wheel. Morphology of the ribbon and powder was observed. Ribbon tensile strength of up to 937 N mm−2 and reduction of area up to 20% was measured.
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Abstract Ni 45 Co 5 Mn 36.6 In 13.4 ribbons were prepared by the melt spinning technique. They are in the austenitic state at the room temperature with a Cubic L2 1 structure and are composed of columnar grains growing perpendicular to the ribbon plane. A nearly single {001}〈100〉 cube component is formed at low wheel‐rotating speed due to the preferential growth of nuclei in the ribbon plane normal and length directions. Appropriate control of the melt spinning condition offers a promising solution to the texturation of polycrystalline ferromagnetic shape memory alloys.
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In this paper, the technology of rapidly solidified (RS) ribbons in Mg-3%Al-1%Zn-0.2%Mn alloy has been investigated using melt spinning technique with low speed. Cooling rate of the as-spun ribbons prepared at different wheel speed is estimated. Microstructures of as-spun ribbons are studied. The result indicates that the cooling rate of the as-spun ribbons with low speed is from 10~4 K/s to 10~5K/s. The grains of as-spun ribbons are smaller than the as-cast ingots'. The microstructure of the as-spun ribbon at 500 rpm along the cross section is uniform. While in the as-spun ribbon at 300 rpm, equiax crystals are found near the roller surface side, and near the unconfined flow surface, column crystals appear.
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Summary form only given. In the present investigations a new alloy composition consisting of Fe-Cr-Co-Ni-Si-Mn prepared by the melt-spinning technique was found to undergo a transformation from a magnetic material into a shape memory ribbon.
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In all previous studies of soft magnetic alloys, magnetic softness is obtained through forming a completely amorphous state via rapid solidification, such as by melt spinning at a high cooling rate followed by annealing, typically at 600 °C, to develop a magnetically isotropic nanostructure. Fine powdering of the annealed alloy via ball milling is then required for manufacturing, net shaping, and 3D printing. However, the soft magnetic properties are susceptible to the subsequent processing conditions, characterized by significantly increased coercivity. Herein, nanoscale crystallites are obtained directly from the melt‐spun Fe 77 Ni 5.5 Co 5.5 Zr 7 B 4 Cu ribbon (i.e., not through annealing of a completely amorphous ribbon) that exhibits structural stability during the annealing and ball‐milling processes. The melt‐spun ribbon annealed at high temperatures (700 °C) remains magnetically soft with H c of ≈0 Oe, which is a key property for high‐temperature applications. Ball milling of the annealed melt‐spun samples results in fine powders with low H c values over a wide temperature range up to 427 °C. It is shown that the rapidly solidified crystalline ribbon provides an ideal precursor for the manufacture of high‐temperature soft magnetic materials. This new approach provides a straightforward method of making soft magnetic alloy powders.
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Amorphous alloys are prepared in continuous ribbon form by rapid quenching directly from the melt. In particular, the process of chill block melt-spinning involves the continuous impingement of molten alloy against a rapidly moving substrate surface. Principles of chill block melt-spinning are presented with regard to the formation of continuous, rapidly-quenched amorphous alloy ribbon. The effects of numerous process variables on sample geometry and physical properties are examined through experimental results obtained by the author and by other researchers. Principles of narrow ribbon manufacture are extended to describe means of fabricating wide ribbon. Manufacturing problems unique to extended runs and potential solutions are cited. Effects of process parameters on magnetic and physical properties of as-cast samples are discussed.
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A (Ho 0.17 Ba 0.33 Cu 0.5 ) 50 Ag 50 alloy ribbon with a non-equilibrium structure was produced by melt-spinning. Heating of the alloy ribbon in air brought about the structural change to a stable metallic phase at about 610 K, followed by the formation of Ho 1 Ba 2 Cu 3 O 6.7 and Ag in the range of 630 to 740 K. The mixed materials of Ho 1 Ba 2 Cu 3 O 6.7 and Ag produced by oxidization of the melt-spun ribbon exhibited high- T c superconductivity with onset at 90 K and zero resistance at 80 K. It is notable that the mixture of Ag enables us to produce an alloy ribbon by melt-spinning even in the Ho-Ba-Cu alloy system with large miscibility gap.
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A non-stoichiometric polycrystalline Ni50Mn27Ga23 magnetic shape memory alloy was prepared by melt-spinning technology. The effects of melt-spinning on the martensitic transformation and magnetic-field-induced strain (MFIS) of the melt-spun ribbon were investigated. The experimental results show that the melt-spun ribbon undergoes the thermal-elastic martensitic transformation and exhibits the thermo-elastic shape memory effect. But the martensitic transformation temperature decreases and Curie temperature remains unchanged. A particular internal stress induced by melt-spinning made a texture structure in the melt-spun ribbon, which made the melt-spun ribbon obtain larger transition-induced strain and MFIS. The internal stress was released under cycling of magnetic field. This resulted in a decrease of MFIS of the melt-spun ribbon.
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