Transactions of Materials and Heat Treatment

Title：Experimental research on grain refining and superplasticity for 1420 Al-Li alloy sheet

Authors： Liu Haotian1 Shen Hongbin2 Xiao Rui1 Li Baoyong1 Liu Wei1 Liu Qi1

Unit： 1.Beijing Hangxing Machinery Manufacturing Co. Ltd 2.Second Military Representative Office of Air Force Equipment Department

KeyWords： clinching prefabricated hole preforming joint reforming hybrid connection connection strength

ClassificationCode：

year,vol(issue):pagenumber：2022,47(3):65-71

Abstract：

In order to study the high-temperature tensile mechanical properties of 1420 Al-Li alloy sheets under different hot rolling processes, 1420 Al-Li alloy sheet with the thickness of 7.3 mm was seclected, the high-temperature rolling test was carried out, and the optimal rolling process and forming conditions were obtained. However, the sheet obtained by the hot rolling process has high availability, the sheet is not completely fine-grained at a reduction amount of 15% in each pass, and the elongation is greatly improved. Then, the high-temperature tensile test at 475 ℃ was conducted by tensile testing machine MTS810, and the influence of the rolling process on the elongation of sheet was analyzed. The results show that the grain refinement of sheet has a greater influence on the elongation. When the strain rate is 0.8×10-3 s-1, the elongation is above 300%, which is in line with the optimal superplastic forming process conditions. Finally, the microstructures of sheet under different preparation processes were analysed and observed by metallographic phase. And it is found that the increase of the reduction amount per pass hinders the movement of dislocations. Thus, the test results provide a theoretical basis for the large-scale industrial application of 1420 Al-Li alloy sheet.

Funds：

国家自然科学基金青年科学基金资助项目（51905512）

作者简介：刘昊天（1998-），男，硕士研究生 E-mail：15797896151@163.com 通信作者：肖瑞（1985-），男，博士，工程师 E-mail:xiaoruidiablo@163.com

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