A kind of preparation method of 2xxx series aluminum alloy transmission electron microscope sample

Abstract

The invention discloses a method for preparing a 2xxx series aluminum alloy transmission electron microscope sample, and belongs to the technical field of transmission electron microscope sample preparation. The method selects a double spray solution mixed with a certain concentration of nitric acid and methanol according to the volume ratio of 1:3, controls the double spray voltage between 18 and 22V, and the double spray temperature between 5°C and 10°C. The samples were thinned on an electrolytic thinning machine. Appropriate selection of double-spray liquid, double-spray voltage and double-spray temperature makes the surface of the sample bright, reduces the potential difference between the second phase and the matrix, effectively avoids the appearance of sieve holes, and realizes uniform thinning. The thinning effect is achieved in 10-20s, which greatly improves the efficiency, and there is no stress and heat input during the thinning process, providing a fast and reliable sample preparation method. The invention can conveniently and simply prepare transmission samples with no sieve hole and larger thin area, which has important reference significance for the preparation of transmission samples of metal materials containing coarse second phases.

Description

technical field [0001] The invention relates to the technical field of preparation of transmission electron microscope samples, in particular to a preparation method of a 2xxx series aluminum alloy transmission electron microscope sample. Background technique [0002] 2xxx series aluminum alloys are widely used in rail transit, aerospace and other fields due to their high specific strength, specific stiffness, excellent corrosion resistance, and comprehensive mechanical properties such as formability. With the rapid development of my country's high-speed railway, aerospace and other fields and the further deepening of the concept of lightweight, 2xxx series aluminum alloys are more and more widely used in important equipment in these fields. Although my country is a big country in the use of aluminum alloys, it is not a strong country. Many product specifications and process standards are directly imitated abroad, and with the development of industrialization, the service en...

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Problems solved by technology

[0004] In view of the poor quality of the existing samples prepared by double jet thinning and the long period of sample preparation by ion thinning, the purpose of the present invention is to provide a method for preparing TEM samples of 2xxx series aluminum alloys, which is suitable for 2xxx series containing coarse precipitates. The preparation of TEM samples of aluminum alloy materials can avoid the appearance of sieve holes, prepare high-quality transmission samples, and further improve efficiency to achieve simpler and more convenient sample preparation

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