Transactions of Materials and Heat Treatment

Title：Microstructure evolution law of ascast 2219 aluminum alloy in hot compression deformation

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ClassificationCode：TG316.2

year,vol(issue):pagenumber：2021,46(1):191-196

Abstract：

In order to solve the problems of coarse microstructure and uneven distribution of the second phase in 2219 aluminum alloy, the microstructure evolution laws during hot compression deformation of as-cast 2219 aluminum alloy were studied. The results show that after hot compression deformation, the coarse grains and the residual crystalline phase distributed as continuous network in the as-cast 2219 aluminum alloy structure are broken, and the uniform recrystallization structure is formed after heat treatment. With the increasing of deformation temperature, the grain structure is coarser, but the distribution of Al2Cu phase is more fine and uniform. With the increasing of deformation amount, the grain structure is gradually refined, the grain size distribution is more uniform, and Al2Cu phase is also broken more fully and the distribution is small and uniform. Furthermore, during the forging and cogging process of large diameter ingot, in order to obtain microstructure with uniform and fine Al2Cu phase, the deformation temperature should be controlled above 420 ℃, and the single deformation amount should not be less than 50%. In addition, the microstructure of material is not significantly affected by extending the holding time after forging. Thus, during the forging and cogging process, the method of reheating and forging with multiple fires is used to ensure the reasonable deformation temperature range.

Funds：

基金项目:民用航天“十三五”预研项目（B0109）

作者简介：张曼曼（1990-），女，硕士，工程师 E-mail：beyond90ah@163.com

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