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Single Roller 법에 의한 Al-Cr 계 합금의 급냉응고 조직과 상분해
조순형,윤의박 ( Soon Hyoung Cho,Eui Pak Yoon ) 한국주조공학회 1987 한국주조공학회지 Vol.7 No.2
Al-Cr alloy with composition in the range from 1.5wt% to 10wt% Cr were rapidly solidified from the melt by the single roller method. The supersaturated solid solution was obtained up to 6wt% Cr in Al-Cr alloy for 20㎛ thickness. Lattice parameter decreased with increasing Cr content at the rate of 0.00456A perwt% Cr up to 6wt% Cr. Microhardness increased with increasing Cr content at the rate of 10㎏/㎟ per wt% Cr up to 6wt% Cr. Microhardness measurements on the Al-6wt% Cr supersaturated solid solution annealed isothermally showed no sign of age hardening. Decomposition temperature, determined by lattice parameter changes and microhardness changes, was 470℃ for Al-6wt% Cr supersaturated solid solution. Transmission electron microscopy showed that decomposition within one hour below 400℃ occurred at grain boundaries only, and also the additional decomposition within grains being evident at 450℃. The coarse precipitate structure showed at 500℃ and 550℃, respectively. The coarse precipitate structure is considered Al_7Cr.
급냉응고한 Al-Cr 계 합금의 응고조직에 미치는 응고속도와 두께의 영향
조순형,남태운,윤의박 ( Soon Hyoung Cho,Tae Yoon Nam,Eui Pak Yoon ) 한국주조공학회 1985 한국주조공학회지 Vol.5 No.2
The thickness ranges and conditions to form the supersaturated solid solution in Al-Cr alloys were investigated with various rapid solidification conditions. Al-Cr alloys, rapidly solidified by using the small droplet chill quenching method, were examined by means of micro-vickers hardness, lattice parameter, thermal analysis and microscopic observation. The results obtained were as follows; 1. With the increase of solidification rate, the solidified structures were changed to intermetallic compound + solid solution, incompletely supersaturated solid solution, completely supersaturated solid solution, in turn. 2. The minimum solidification rate required to form completely supersaturated solid solution was 2.5×10^(-2)㎝/sec, 3.6×10^(-2)㎝/sec and 6.0×10^(-2)㎝/sec for Al-1.0wt%Cr, Al-1,2wt%Cr and Al-1.5wt%Cr, respectively. 3. The maximum distance from the chill surface required to form completely supersaturated solid solution was 5㎜, 1.3㎜ and 0.3㎜ for Al-1.0wt%Cr, Al-1.2wt%Cr and Al-1.5wt% Cr, respectively.