Large-plasticity cobalt-based bulk amorphous alloy with high amorphous forming ability and preparing method large-plasticity cobalt-based bulk amorphous alloy

Abstract

The invention provides a large-plasticity cobalt-based bulk amorphous alloy with high amorphous forming ability. The molecular formula of the bulk amorphous alloy is CoaFebBxSiyNbcCud, in the formula,a, b, c, d, x and y show atomic percents of corresponding alloying elements, wherein a is larger than or equal to 35 and smaller than or equal to 48, b is larger than or equal to 20 and smaller thanor equal to 36, c is larger than or equal to 4 and smaller than or equal to 5, d is larger than or equal to 0.1 and smaller than or equal to 0.9, x is larger than or equal to 20 and smaller than or equal to 24, y is larger than or equal to 4 and smaller than or equal to 5.5, a+b is larger than or equal to 65 and smaller than or equal to 71.9, and a+b+c+d+x+y is equal to 100. Compared with the prior art, the alloy has the obviously beneficial effects that the high amorphous forming ability, the outstanding plastic deformation capacity and the excellent soft magnetic property are achieved, the maximum critical diameter reaches 3 mm-5.5 mm, the breaking strength is 4060 MPa-4400 MPa, the plastic deformation capacity is 1%-3.7%, the saturation magnetization is 0.72 T and above, and the coercive force is 0.81A/m-1.41 A/m; and the alloy does not contain rare earth elements and easy volatile elements, the preparing process is simple, and the good application prospect is achieved. The invention further provides a preparing method of the above alloy.

Description

technical field [0001] The invention relates to the technical field of amorphous alloys, in particular to a cobalt-based bulk amorphous alloy with high amorphous forming ability and high plasticity and a preparation method thereof. Background technique [0002] Bulk amorphous alloy is a new type of soft magnetic alloy material, which has the characteristics of both metal and glass, and has excellent mechanical, magnetic, electrochemical properties and precision formability. It is used in aerospace devices, precision machinery, information technology, etc. domain shows significant application value. [0003] In 1960, the research group of Professor Duwez of the California Institute of Technology reported the rapid quenching technology of using a spray gun to quench liquid metal, which can make the cooling rate of liquid metal reach 10 5 -10 6 K / s, thus preparing Au 75 Si 25 amorphous alloy. The invention of liquid phase quenching technology has greatly promoted the devel...

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Problems solved by technology

[0005] Chinese patent CN101545082B discloses a cobalt-based bulk amorphous alloy and its preparation method. The alloy composition is: Co33-55%, Fe13-34%, B18-26%, Si2-7%, Nb3-8%. The size is up to 3-5mm. However, the alloy components with strong amorphous forming ability in this alloy system have relatively poor soft magnetic properties. Among them, the alloy with a critical diameter of 4mm or more has a saturation magnetic induction lower than 0.71T and a coercive force as high as 1.17-2.14A / m

However, the cobalt-based bulk amorphous alloy needs to be annealed for stress relief near the glass transition temperature, and the preparation process is relatively complicated, which affects its popularization and application.

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