Mechanical training method for Ti-Ni marmem

Abstract

The present invention relates to shape memory alloy, and is especially the mechanical training method for Ti-Ni shape memory alloy. By means of stress control or strain control mode and through symmetrical pulling and pressing to load to reach the saturated circulation stress times at room temperature. Ti-Ni shape memory alloy with stable martensite phase change temperature is obtained. The present invention has short training time and no damage to the material, can save power and lower training cost, and is suitable for industrial application.

Description

technical field [0001] The invention relates to a shape-memory alloy, in particular to a mechanical training method for a titanium-nickel shape-memory alloy. Background technique [0002] The shape memory effect means that the alloy material undergoes martensitic phase transformation, deforms at a low temperature (martensite), and is heated to a high temperature (parent phase), and the alloy material returns to its original shape before deformation. Among the many shape memory alloys, TiNi alloy has been widely studied and applied for its good memory effect, mechanical properties, wear resistance and corrosion resistance, and is currently the most successful and important memory alloy. [0003] Utilizing the characteristics of shape memory alloys undergoing phase transformation when heated, and being able to remember and restore the original shape, people hope to make smart components that integrate perception and drive. It has small size, low cost, simple structure, and can...

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Problems solved by technology

[0003] Utilizing the characteristics of shape memory alloys undergoing phase transformation when heated, and being able to remember and restore the original shape, people hope to make smart components that integrate perception and drive. It has small size, low cost, simple structure, and can replace complex electromechanical systems. It has the advantages of application in complex environments; however, the temperature at which the phase transition of shape memory alloys occurs is unstable, which seriously affects the reliability of the application of memory alloy products and restricts the commercial application of memory alloys. The problem of temperature stability has become a bottleneck restricting the popularization and application of memory alloy products

[0004] At present, the thermomechanical training method is mainly used in the world to obtain the stable phase transition temperature of the memory alloy. This method stretches the memory alloy wire to a certain amount of deformation, and repeatedly heats and cools it in this state, that is, the phase transition occurs repeatedly. The main disadvantage of this method is that the alloy material must be repeatedly heated and cooled, the training process is long, the cost is high, and the material will be damaged when the deformation is large, which is not suitable for industrial production.

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