pISSN : 1598-706X / eISSN : 2288-8381
한국주조공학회지 (29권6호 265-269)
RRA Treatment of Semi-Solid Al-Zn-Mg-Cu Al Alloy Fabricated by Cooling Plate
냉각판으로 제조된 Al-Zn-Mg-Cu계 반응고 알루미늄 합금의 RRA 처리
Dae-Hwan Kim, Sung-Yong Shim, Young-Hwa Kim, Su-Gun Lim
Gyeongsang National University
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 180oC to recovery the T6 heat treatment strength.
Al-Zn-Mg-Cu alloy, Semi-solid, RRA, Cooling plate, SCC.
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