期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.141092
关键词
Al-Cu-Li alloys; Long-term ageing; Precipitation; Microstructure; Mechanical properties
类别
资金
- Domain Foundation of Equipment Advance Research of 13th Five-year Plan [61409220124]
- Beijing Municipal Natural Science Foundation [2214072]
- China Postdoctoral Science Foundation [2019M660451]
- National Natural Science Foundation of China [51971031]
Research has shown that controlled long time low-temperature ageing (LTA) at 85 degrees Celsius can improve the microstructure of 2195 Al-Cu-Li alloy, resulting in increased material strength and elongation properties. This LTA method is particularly useful for Al-Cu-Li alloys with low Li and high Cu contents.
High-strength Al-Cu-Li alloys are increasingly attractive for aerospace applications. The highest-strength Al-Cu-Li alloys require a series of high-temperature ageing coupled with strain imposed before or during ageing to form a high number density of precipitates (particularly T-1) by solid-state precipitation. We found that a controlled, long time low-temperature ageing (LTA) at 85 degrees C was sufficient to continuously mediate the fine precipitation in between T-1 platelets in a 2195 Al-Cu-Li alloy following T8 treatment. The microstructures caused by LTA were more uniform than those characteristic of T8 condition, along with the reduction of precipitate-free zones (PFZs) between T-1 platelets, which resulted in better material strength and elongation properties. The LTA method is supposed to be particularly useful in Al-Cu-Li alloys with low Li and high Cu contents, in which complementary precipitation of a fine mixture of delta', theta'/GP zones and T-1 is available and in the meantime significant coarsening of delta' precipitates is unattainable.
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