Design and manufacturing device for preparing grain boundaries with different included angles by utilizing cold welding and method

Abstract

The invention discloses a design and manufacturing device for preparing grain boundaries with different included angles by utilizing cold welding. The design and manufacturing device comprises a supporting piece, two bending pieces are arranged in the supporting piece and are oppositely arranged, one ends of the two bending pieces are fixedly connected with the supporting piece, one end, far away from the supporting piece, of any bending piece is fixedly connected with a first sample through a fixing piece, a second sample is fixedly connected to the end, away from the supporting piece, of the other bending piece through the fixing piece, the first sample and the second sample are correspondingly arranged, and the bending pieces comprise first metal sheets and second metal sheets which are different in thermal expansion coefficient. According to the design and manufacturing device, the angle of butt welding of the first sample and the second sample can be controlled by changing the included angle of the bimetallic strip, and designing can be carried out on the orientation angles of the grain boundaries formed by cold welding; and according to the device, the processing visual field of a focused ion beam system is reserved to the maximum extent, in-situ atomic scale observation of a sample butt joint tip is not affected, meanwhile, butt joint welding of different kinds of materials can be achieved, and different kinds of material grain boundaries can be prepared.

Description

technical field [0001] The invention relates to the technical field of material deformation, in particular to a design and manufacture device and method for preparing grain boundaries with different angles by cold welding. Background technique [0002] Due to the continuous development of the development and application of micro-nano devices, higher requirements have been put forward for nanostructured materials and micro-nano processing technology, and related fields have become a hot spot in material research and development. The study found that the structural evolution and mechanical behavior of nanomaterials during the deformation process are quite different from those of macroscopic bulk materials. Therefore, the research on the grain boundary of nanomaterials is very important for exploring the structure evolution of nanomaterials and realizing the performance design of nanomaterials. [0003] Welding is an effective method to prepare grain boundaries with specific o...

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Problems solved by technology

[0004] However, due to the high requirements for sample characterization and operation precision in the extraction, positioning, and docking of nanowires, and the sensitivity of nanowires to environmental changes, there are technical difficulties in the research of nanowire butt welding

At present, the research methods of cold welding of nanowires are mainly divided into two categories, both of which are realized in the transmission electron microscope platform: the first type is the pull-off-welding method, which generally uses MEMS devices to pull off the pre-fixed nanowires in the TEM and then dock them. Realize cold welding. The advantage of this method is that the two broken nanowires are easy to align, and the sample preparation is convenient. The main limitation is that it is difficult to achieve cold welding of different types and different orientations of nanowires; the second type is the probe method. , generally use a probe that can move three-dimensionally in the TEM pole piece to load one nanowire, and the other nanowire is fixed on the sample rod stage, and the two nanowires are butt welded by controlling the movement of the probe. The advantage is that it can realize cold welding of nanowires of different types and different orientations. The main limitation is that the current micro-nano electromechanical technology is difficult to achieve in-situ double-tilt of this type of sample rod, making it difficult for researchers to obtain samples during deformation. structure information

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