Method for improving function stability of nickel-titanium shape memory alloy

A technology of memory alloy and stability, which is applied in the field of nickel-titanium shape memory alloy, can solve problems such as the insignificant strength effect of the nickel-titanium shape memory alloy matrix, difficulty in handling nickel-titanium alloy components, and unsuitable nickel-titanium alloy components, etc., to achieve improvement Functional stability, improvement of matrix strength, and effect of improving functional stability
CN108754236AActive Publication Date: 2018-11-06SHANDONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG UNIV
Publication Date
2018-11-06

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Abstract

The invention relates to a method for improving the function stability of a nickel-titanium shape memory alloy, and belongs to the field of nickel-titanium shape memory alloys. According to the method, dislocations and other defects are introduced into the nickel-titanium shape memory alloy, the dislocations serve as activity position points for promoting second phase nucleation, then, fine and evenly-distributed nano reinforcement phases are formed in a matrix structure of the nickel-titanium shape memory alloy through later aging treatment, accordingly, the matrix strength of the nickel-titanium shape memory alloy is obviously improved, and then the function stability of the alloy is improved. Meanwhile, in the method, only temperature martensite phase change induction circulation or stress martensite phase change induction circulation need to be conducted on a nickel-titanium shape memory alloy component before aging treatment, and operation is simple and convenient; and the methoddoes not have the requirement for the shape of the nickel-titanium shape memory alloy component, and the method is adaptive to the complex nickel-titanium shape memory alloy component and capable of effectively improving the function stability of the complex nickel-titanium shape memory alloy component.
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Description

technical field

[0001] The invention belongs to the field of nickel-titanium shape memory alloys, and in particular relates to a method for improving the functional stability of nickel-titanium shape memory alloys through the synergistic effect of cyclic loading and low-temperature aging. Background technique

[0002] Nickel-titanium shape memory alloy exhibits shape memory effect and superelasticity, and is an intelligent material integrating sensing and driving. It has broad application prospects in the automotive industry, artificial intelligence, aerospace, marine transportation, and biomedical fields. Nickel-titanium shape memory alloy components generally undergo repeated phase transformation processes in practical applications. In this process, the accumulation of plastic deformation caused by cyclic phase transformation is the main reason for the decrease in the functional stability of nickel-titanium shape memory alloy components. . This severely limits the servic...

Claims

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