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均匀化退火工艺对5A83铝合金铸锭组织及性能的影响
Effect of the Homogenization Annealing Process on the Microstructure and Properties of 5A83 Aluminum Alloy Ingot
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- DOI:
- 作者:
- 杨 龙，代 敏，车 云，门三泉，李 祥
YANG Long, DAI Min, CHE Yun, MEN Sanquan , LI Xiang
- 作者单位:
- 贵州华科铝材料工程技术研究有限公司，贵州 贵阳 550014
Guizhou Huake Aluminum Materials Engineering Research Co. Ltd., Guiyang 550014, China
- 关键词:
- 5A83 铝合金；工业化生产；均匀化退火工艺；组织性能
5A83 aluminum alloy; industrial production; homogenization annealing process; microstructure and properties
- 摘要:
- 本文研究了 5A83 铝合金均匀化退火工艺，并探索了不同温度条件对其微观组织及性能的影响。 在退火时
长为 15 h 的情况下，分别观察了 350 、400 、440 、470 、485 、540 ℃ 6 种不同退火温度下的显微组织变化，测量了其晶粒
尺寸与硬度。 结果表明，β 相和 Mn 相交互作用的特征为：当退火温度低于 400 ℃时，β 相的回溶与过饱和 Mn 相的析出
同时进行，后者对晶粒粗化的作用掩盖了前者对晶粒的细化作用；当退火温度高于 440 ℃时，Mn 相的回溶对晶粒细化
发挥主导作用，对反常态(随着均匀化退火温度升高，基体硬度先下降后上升)给出了合理解释，并认为 485 ℃是最为理
想的退火温度。
The homogenization annealing process of 5A83 aluminum alloy was studied to explore the effects of different temperature conditions on its structure and properties. Under the condition of an annealing time of 15 h, the microstructure evolution at different annealing temperatures of 350, 400, 440, 470, 485 and 540 ℃ was observed and the grain size and hardness were measured. The results show that the interaction between the β phase and Mn phase is characterized as follows: when the annealing temperature is lower than 400 ℃ , dissolution of the β phase and precipitation of the supersaturated Mn phase occur simultaneously, and the coarsening effect of the latter on the grain size conceals the refining effect of the former on the grain size. When the annealing temperature is above 440 ℃, the redissolution of the Mn phase plays a leading role in grain refinement. A reasonable explanation is given for the abnormal state (the matrix hardness decreases first and then increases with increasing homogenizing annealing temperature), and 485 ℃ is the most ideal annealing temperature.