Preparation method of 2xxx series aluminum alloy transmission electron microscope sample

Abstract

The invention discloses a preparation method of a 2xxx series aluminum alloy transmission electron microscope sample, and belongs to the technical field of transmission electron microscope sample preparation. The method comprises the following steps: selecting a double-spraying liquid formed by mixing nitric acid and methanol with a certain concentration according to a volume ratio of 1:3, controlling the double-spraying voltage to be 18-22V and the double-spraying temperature to be 5-10 DEG C, and thinning a sample on a double-spraying electrolytic thinning instrument. Due to the selection ofproper double-spraying liquid, double-spraying voltage and double-spraying temperature, the surface of a sample is bright, the potential difference between a second phase and a base body is reduced,sieve pores are effectively avoided, uniform thinning is achieved, the thinning effect can be achieved within 10-20 s, the efficiency is greatly improved, no stress or heat is input in the thinning process, and the invention provides a rapid and reliable sample preparation method. By utilizing the method, the transmission sample without sieve pores and with a larger thin area can be conveniently and simply prepared, and the method has important reference significance for preparing the metal material transmission sample containing the thick second phase.

Description

technical field [0001] The invention relates to the technical field of transmission electron microscope sample preparation, in particular to a method for preparing a 2xxx series aluminum alloy transmission electron microscope sample. Background technique [0002] 2xxx series aluminum alloys are widely used in rail transportation, aerospace and other fields due to their comprehensive mechanical properties such as high specific strength, specific stiffness, excellent corrosion resistance, and processing and forming properties. With the rapid development of my country's high-speed railway, aerospace and other fields and the further deepening of the lightweight concept, the application of 2xxx aluminum alloys in important equipment in these fields has become more and more extensive. Although my country is a big country in the use of aluminum alloys, it is not a powerful country. Many product specifications and process standards are directly imitated from foreign countries, and w...

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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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