Effect of Retrogression and Re-aging Treatment on Properties and Microstructure of a New Type of Al–Zn–Mg–Er–Zr Alloy
Tóm tắt
The effect of retrogression and re-aging treatment (RRA) on properties and microstructure of a new type of Al–Zn–Mg–Er–Zr alloy are investigated. The results show that extending retrogression time is beneficial to improve intergranular corrosion (IGC) and exfoliation corrosion (EXCO) resistance but decreases the strength. The mechanical properties and corrosion resistance of the studied alloy are associated with the grain interior precipitates, grain boundary precipitates (GBPs) and precipitates free zone (PFZ). Fine
$${\upeta }^{,}$$
phases of the grain interior gradually dissolve in the matrix, and the residual
$${\upeta }^{,}$$
phases transform to
$$\upeta $$
phases during retrogression treatment. Re-precipitation of the dissolved
$${\upeta }^{,}$$
phases will result in a denser and finer
$${\upeta }^{,}$$
phases in the grain interior after re-aging treatment. The GBPs are more coarse and discrete distribution, and the PFZ becomes wider as the retrogression time increases. And the effect of Al3(Er,Zr) precipitates on the comprehensive performance of the studied alloy has also been discussed in detail.
Tài liệu tham khảo
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