Polycrystalline Ni-Mn-Ga-RE alloy and preparation method thereof
An alloy and general formula technology is applied in the field of Ni-Mn-Ga ferromagnetic shape memory alloy and its preparation, which can solve the problems of low strength, high brittleness and poor machinability of Ni-Mn-Ga alloy, so as to improve mechanical properties. performance, compressive rupture strength increase, effect of enhancing processability
Inactive Publication Date: 2008-08-06
HARBIN INST OF TECH
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Problems solved by technology
[0003] The purpose of the present invention is to solve the problems of low strength, high brittleness and poor workability of existing Ni-Mn-Ga alloys; and to provide a polycrystalline Ni-Mn-Ga-RE alloy and a preparation method thereof
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specific Embodiment approach 1
[0007] Specific embodiment 1: In this embodiment, the general structural formula of the polycrystalline Ni-Mn-Ga-RE alloy is Ni 50 mn 29 Ga 21-X RE X , in the general structural formula 0<X≤5, RE represents a rare earth element, wherein RE is dysprosium (Dy), gadolinium (Gd) or yttrium (Y).
[0008] The polycrystalline Ni-Mn-Ga-RE alloy of this embodiment has high strength, low brittleness, and is easy to process.
specific Embodiment approach 2
[0009] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the general structural formula X=0.1-4. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0010] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the general structural formula X=0.2. Others are the same as in the first embodiment.
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Abstract
The invention relates to polycrystalline Ni-Mn-Ga-Re alloy and a method for preparing the alloy and relates to Ni-Mn-Ga ferromagnet-shaped memory alloy and a method for preparing the ferromagnet shaped memory alloy. The invention solves the problem that existing Ni-Mn-Ga alloy has low strength, big brittleness and bad machinable performance. The general structure of products of the invention is Ni50Mn29Ga21-XREX, wherein 0<X<=5, RE represents rare earth elements, and RE is dysprosium or gadolinium or yttrium. The method of the invention comprises: arranging electrolytic nickel sheet, electrolytic manganesium, gallium and RE into a melting chamber according to the stoichiometric ratio of a molecular formula, melting for 10-15minutes under the argon gas protecting phenomenon that the temperature is 1500DEG C-1700DEG C and the purity is 99.999%, inverting alloy blocks and repeating the operations for four to six times, then, removing impurity on the surface through polishing by machinery, then, using methyl ketone to wash for three or four times, then sealing in a quartz capsule whose vacuum degree is 10<-1> Pa-10<-2> Pa, heat-preserving for 20-24hours under the condition that the temperature is 750-850DEG C to uniformize, and then quenching in water.
Description
technical field [0001] The invention relates to a Ni-Mn-Ga ferromagnetic shape memory alloy and a preparation method thereof. Background technique [0002] Ferromagnetic shape memory alloy is a new type of shape memory material, which has thermoelastic martensitic transformation and ferromagnetic transformation. It not only has the shape memory effect of traditional shape memory alloy controlled by temperature field, but also can generate shape under the action of magnetic field. memory effect. Ni-Mn-Ga alloy is the earliest discovered ferromagnetic shape memory alloy, and it is also the material with the most practical potential at present, and its research is the most in-depth and representative. Existing studies have shown that under the action of a 300K, 1T magnetic field, the 7M structure of Ni 48.8 mn 29.7 Ga 21.5 A magnetically induced strain of up to 9.5% has been obtained in the single variant; in addition, the response frequency of the Ni-Mn-Ga alloy reaches th...
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IPC IPC(8): C22C30/00C22C1/02C22F1/16
Inventor 隋解和高丽高智勇蔡伟
Owner HARBIN INST OF TECH