THE EXPENDING RETROGRESSION TIME OF HOT-EXTRUDEDSc-CONTAININGAl–Zn–Mg–CuALLOY

Sung-Yong Shim, Dae-Hwan Kim, Young-Rock Sung, In-Shup Ahn and Su-Gun Lim ()
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Sung-Yong Shim: i-Cube Center, Engineering Research Institute, Gyeongsang National University, 900 Gazwadong, Jinju 660-701, Gyeongnam, Korea
Dae-Hwan Kim: i-Cube Center, Engineering Research Institute, Gyeongsang National University, 900 Gazwadong, Jinju 660-701, Gyeongnam, Korea
Young-Rock Sung: i-Cube Center, Engineering Research Institute, Gyeongsang National University, 900 Gazwadong, Jinju 660-701, Gyeongnam, Korea
In-Shup Ahn: i-Cube Center, Engineering Research Institute, Gyeongsang National University, 900 Gazwadong, Jinju 660-701, Gyeongnam, Korea
Su-Gun Lim: i-Cube Center, Engineering Research Institute, Gyeongsang National University, 900 Gazwadong, Jinju 660-701, Gyeongnam, Korea

Surface Review and Letters (SRL), 2010, vol. 17, issue 03, 293-298

Abstract: In this paper, the retrogression and reaging (RRA) behavior and corrosion properties ofSc-containingAl–Zn–Mg–Cualloy were observed. The dependence of the mechanical properties and corrosion resistance on the heat treatment condition was measured by hardness, tensile, C-ring and conductivity testing. The retrogression time for recovery of the yield strength of the alloy subjected to T6 treatment was 20 min at 200°C of retrogression temperature, which was longer than that ofAl7075alloy. The results of electrical conductivity and C-ring tests showed that the stress corrosion cracking (SCC) resistance inSc-containing alloy treated for 20 min at 200°C was improved. These study results demonstrated the ability of theSc-containing alloy to extend the retrogression time and thereby improve the SCC resistance and mechanical properties.

Keywords: Al–Zn–Mg; Sc; retrogression and reaging; stress corrosion cracking (search for similar items in EconPapers)
Date: 2010
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DOI: 10.1142/S0218625X10013734

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