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Al-Mg-Si 합금의 응고편석과 (凝固偏析) 균질화거동에 (均質化擧動) 미치는 Cr 및 Ti 의 영향
최정철,수총유강 (手塚裕康),신미창언 (神尾彰彦),고고항부 (高稿恒夫),윤의박 ( J . C . Choe,H . Tezuka,A . Kamio,T . Takahashi,E . P . Yoon ) 한국주조공학회 1988 한국주조공학회지 Vol.8 No.1
Microsegregation and its homegenization behavior of magnesium and silicon in Al-1, 1wt %Mg-0.68wt%Si alloy as well as those of chromium and titanium in the alloy have been investigated. Minimum magnesium and silicon concentrations in alpha-dendrite arm are 0.4wt% and 0.2wt% that are one half and one third of each composition, respectively. The concentrations are, however, rapidly homogenizecl at 530℃. Titanium and chromium elements make grain size be greatly refined in Al-Mg-Si alloys but they are remarkably concentrated at the center of alpha-dendrite arm and from a cored structure. The maximum concentrations increase two to three times for titanium and one and a half times for chromium. The concentration of titanium does not appear outside the cored structure but that of chromium is approximately one half of the total ahromium amount. These do not disappear at 530℃ for 100 hours. During homogenization treatment, chromium is deposited as E phase of Al_(18)Mg₃Cr₂ around crystallized compounds and its distribution becomes inhomogeneous.
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.