Effect of quench-induced precipitation on microstructure and mechanical properties of 7085 aluminum alloy
| Autor: | Huaqiang Lin, Lin Sun, Lingying Ye, Qun Li, Shengdan Liu, Tao Long, Yunlai Deng |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Alloy Metallurgy 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Microstructure 01 natural sciences law.invention Optical microscope Mechanics of Materials law Phase (matter) 0103 physical sciences Vickers hardness test Scanning transmission electron microscopy lcsh:TA401-492 engineering lcsh:Materials of engineering and construction. Mechanics of materials General Materials Science 0210 nano-technology High-resolution transmission electron microscopy Tensile testing |
| Zdroj: | Materials & Design, Vol 132, Iss, Pp 119-128 (2017) |
| ISSN: | 0264-1275 |
| DOI: | 10.1016/j.matdes.2017.06.054 |
| Popis: | The effects of quench-induced precipitation on microstructure and mechanical properties of 7085 aluminum alloy were investigated by means of hardness test, tensile test, optical microscopy, conventional and high resolution transmission electron microscopy and scanning transmission electron microscopy. Apart from quench-induced η phase, a plate-like Y phase appears with the decrease of cooling rate from 240 K/s to 3.2 K/s after solution heat treatment. η phase exists primarily in recrystallized grains and has little strengthening effect. Y phase mainly exists in subgrains with a high density of dislocations, it has a high aspect ratio and therefore gives rise to higher hardness and strength for the slowly-cooled specimens after natural aging. After further artificial aging, the aspect ratio of the Y phase decreases and its strengthening effect becomes smaller; moreover, the presence of η and Y phases reduces the quantity of metastable η′ strengthening precipitates and therefore leads to a smaller increment in hardness and strength for the slowly-cooled specimens; consequently, the rapidly-cooled specimens have higher hardness and strength than the slowly-cooled ones. Keywords: 7085 aluminum alloy, Microstructure, Mechanical properties, Quench-induced precipitation |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect