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RRA Treatment of Semi-Solid Al-Zn-Mg-Cu Al Alloy Fabricated by Cooling Plate  

Kim, Dae-Hwan (i-Cube Center, Engineering Research Institute, Gyeongsang National University)
Shim, Sung-Yong (i-Cube Center, Engineering Research Institute, Gyeongsang National University)
Kim, Young-Hwa (i-Cube Center, Engineering Research Institute, Gyeongsang National University)
Lim, Su-Gun (i-Cube Center, Engineering Research Institute, Gyeongsang National University)
Publication Information
Journal of Korea Foundry Society / v.29, no.6, 2009 , pp. 265-269 More about this Journal
Abstract
The optimum RRA heat treating conditions and SCC (stress corrosion cracking) resistance of semi-solid Al-Zn-Mg-Cu alloy fabricated by inclined cooling plate were compared with those of conventional mould cast alloys. The non-stirring method characterized by using a cooling plate can effectively eliminate dendritic structure and form a fine globular semisolid microstructure in as-cast Al-Zn-Mg-Cu alloy and the SCC resistance of semi-solid Al-Zn-Mg-Cu alloy was higher than that of conventional mold cast alloy. Also, after retrogressed treatment at RRA heat treatment of semi-solid Al-Zn-Mg-Cu alloy, retrogressed treatment time has increased more than 10 minutes at $180^{\circ}C$ to recovery the T6 heat treatment strength.
Keywords
Al-Zn-Mg-Cu alloy; Semi-solid; RRA; Cooling plate; SCC;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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