effects of cryogenic treatment on the microstructure and residual stress of 7075 aluminum alloy
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2018
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Abstract
The effect of cryogenic treatment (CT) on the microstructure, residual stress, and dimensional stability of 7075 aluminum alloy under temperatures of 0 °C, −60 °C, −120 °C, and −196 °C were studied, using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), an X-ray diffractometer, and an X-ray stress tester. The results indicated that CT can facilitate the dissolution of the coarse secondary phase into the α(Al) matrix, promote uniform distribution of Mg, Cu, Zn elements, and increase the density of fine secondary phases in the 7075 Al alloy. The CT can also induce the rotation of the α(Al) grain towards (200), through the processes of recovery and recrystallization. It was found that the residual stress was released, and a higher dimensional stability of the 7075 aluminum alloy was achieved, after CT. Experimental results demonstrated that the optimum CT temperature for the 7075 aluminum alloy is −120 °C.
| Reference Key |
wei2018metalseffects
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|---|---|
| Authors | ;Lijun Wei;Dawei Wang;Haisheng Li;Di Xie;Fan Ye;Ruokang Song;Gang Zheng;Sujun Wu |
| Journal | seminars in cancer biology |
| Year | 2018 |
| DOI |
10.3390/met8040273
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| URL | |
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