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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Flow stress of 2197 Al-Li alloy during hot compression deformation
WEI Xiu-yu(魏修宇), ZHENG Zi-qiao(郑子樵), FU Xin(付 欣), CHEN Qiu-ni(陈秋妮)

School of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract:The flow stress behavior of 2197 Al-Li alloy during hot compression deformation was studied in the strain rate range from 0.01 to 10 s−1 and the temperature range from 360 to 510 ℃ by isothermal compression test on a Gleeble-1500 thermal-mechanical simulator. The results show that the flow stress of 2197 Al-Li alloy decreases with the increase of deformation temperature and increases with the increase of strain rate. The peak flow stress during high temperature deformation can be represented by Z parameter in a hyperbolic sine function. The analytical expression of peak flow stress was fitted with the hot deformation activation energy of 260.6 kJ/mol.

 

Key words: 2197 Al-Li alloy; hot compression deformation; flow stress; Z parameter

ISSN 1672-7029
CN 43-1423/U

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