期刊
MATERIALS
卷 16, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/ma16083042
关键词
Al-Cu-Mg alloy; heat treatment; deformation; microstructure; mechanical property
The presence of a second phase in Al-Cu-MG alloys, which can be changed by pre-heat-treatment, significantly affects hot workability and mechanical performance. Pre-heat-treated samples showed higher resistance to deformation, better dynamic recovery, and enhanced mechanical properties compared to as-cast samples.
The presence of a second phase in Al-Cu-MG alloys, with various sizes and supersaturation-solid-solubility, which can be changed by pre-heat-treatment, could have remarkable influence on hot workability and mechanical performance. In the present work, a continuously cast 2024 Al alloy was homogenized and then subjected to hot compression and continuous extrusion (Conform) along with the initial as-cast alloy. The results showed that the 2024 Al alloy specimen with pre-heat treatment had a higher resistance to deformation and dynamic recovery (DRV) during hot compression process compared with the as-cast sample. Meanwhile, dynamic recrystallization (DRX) was advanced in the pre-heat-treated sample. After the Conform Process, the pre-heat-treated sample also attained better mechanical properties without additional solid solution treatment. The higher supersaturation solid solubility and dispersoids generated during pre-heat treatment was proved to play a key role in restricting boundary migration, tangling dislocation motion and promoting the precipitation of S phase, which raised resistance to DRV and plastic deformation and enhanced the mechanical properties.
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