On the role of Sc or Er micro-alloying in the microstructure evolution of Al-Mg alloy sheets during annealing
Autor: | Jiwu Huang, Le Fu, Yao Li, Zhimin Yin, Guofu Xu, Fuqing Jiang |
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Rok vydání: | 2019 |
Předmět: |
010302 applied physics
Materials science Annealing (metallurgy) Mechanical Engineering Alloy Recrystallization (metallurgy) 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Indentation hardness Brass Mechanics of Materials Transmission electron microscopy visual_art 0103 physical sciences engineering visual_art.visual_art_medium General Materials Science Composite material 0210 nano-technology Electron backscatter diffraction |
Zdroj: | Materials Characterization. 157:109918 |
ISSN: | 1044-5803 |
Popis: | Microstructure evolutions of a Sc-containing and an Er-containing Al-Mg alloy during annealing process were investigated comparatively. Microhardness of the Er-containing alloy decreases with the increase of annealing temperature and a dramatic decrease is observed between 300 °C and 400 °C. Electron backscatter diffraction (EBSD) and transmission electron microscope (TEM) results show that the recrystallization process of the Er-containing alloy finishes rapidly between 350 °C and 400 °C, resulting in the formation of large recrystallized grains and the loss of sub-structure strengthening. In comparison, the Sc-containing alloy shows good thermal stability and the dramatic decrease of microhardness occurs between 450 °C and 550 °C. The Sc-containing alloy maintains sub-structures even after annealing at 400 °C for 1 h. The different recrystallization behavior of the two alloys is attributed to the fact that Al3(Scx, Zr1-x) dispersoids have higher thermodynamic stability than Al3(Erx, Zr1-x) dispersoids. Cold-rolled sheets of the two experimental alloys exhibit typical rolling texture, mainly consisting of Brass, Copper, and S orientations. Texture components of the two alloys dramatically change to random orientations once recrystallization completes. In-situ high-temperature XRD results reveal that dislocation density of the Sc-containing and the Er-containing cold-rolled sheets decreases rapidly with the increase of temperature. Sc or Er addition does not exert significant influence on the annihilation of dislocation at low-temperature annealing (below 250 °C). |
Databáze: | OpenAIRE |
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