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미량 Cr 및 Ti 를 함유하는 Al-Mg-Si 합금의 용질편석과 석출조직
최정철,수총유강,신미창언,고교항부,류성곤 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.5
In Al-1.1wt%Mg-0.68wt%Si alloy the effect of Cr and Ti additions on precipitation behavior of the homogenized and/or aged specimens has been investigated homogenizing. Ephase(Al, Mg, Cr₂) is preferentially precipitated around Mg₂Si and distributed unevenly near a cored dendrite structure. With the addition of Cr and Ti the aged microstructure has indicated that the coarsening of needle-shaped G. P. zone and rod-shaped intermediate phase(β') is delayed, and transition from needle-shaped G. P. zone to β' phase is, thus, delayed. This in turn, caused deceleration of the hardness decrease rate during overaging.