Device and method for observing shape memory alloy tension-torsion experiment

Abstract

The invention discloses a device for observing a shape memory alloy tension-torsion experiment acting below a scanning electron microscope. The device comprises a shape memory alloy tension-torsion experiment clamp and a scanning electron microscope observing system used for observing the change characteristic of the surface microstructure of a test piece in the pseudoelasticity phase change process of the shape memory alloy tension-torsion experiment. The shape memory alloy tension-torsion experiment clamp including a clamp head, a tension and pressing experiment unit and a torsion experiment unit and the scanning electron microscope observing system are adopted to observe the change characteristic of the surface microstructure of the test piece in the pseudoelasticity phase change process of the shape memory alloy tension-torsion experiment. The tension and torsion performance test of shape memory alloy can be simultaneously completed, the test piece is convenient and fast to mount and fix, the clamping connection is stable and reliable, and the tension and torsion performance test of the shape memory alloy with a special function can be completed well. The performance study of the shape memory alloy is facilitated, cost is low, and the device has the advantage of being cheap in implementation.

Description

technical field [0001] The invention relates to the technical field of tension and torsion performance testing, and in particular to a shape memory alloy tension and torsion experimental observation device and method acting under a scanning electron microscope. Background technique [0002] Shape memory alloy is an alloy with shape memory effect, which belongs to a new type of functional material integrating perception and drive. The unique thermoelastic martensitic transformation of shape memory alloys (Shape Memory Alloys, SMAs) under thermal load endows them with exotic properties, such as shape memory effect (Shape Memory Effect, SME) and pseudoelasticity (Pseudoelastisity, PE). These properties make shape memory alloys widely used in industry, defense, instrumentation and medical fields. Shape memory alloys are widely used in the fields of electronics, machinery, aerospace, transportation, construction, chemistry, medical treatment, energy, home appliances and daily ne...

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Problems solved by technology

However, due to the high cost and special performance of the shape memory alloy, it is necessary to make a test piece of a smaller size (generally the detection part adopts a round tube shape with a diameter of about 5mm), and then cooperate with temperature control measures, so as to be accurate. Detect its tensile and torsion performance, as well as the function of recovery under high temperature

In the prior art, there are also some equipment capable of testing the tensile and torsion properties of small-sized specimens, but all of them have the defect of high cost, and are also not suitable for the tensile and torsion performance testing of shape memory alloys with special functions.

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