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Al-Zn-Mg 합금에서 Cr 이 기계적 성질에 미치는 영향
남수우,전주매,박동석 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.10
The mechanical behaviors of a wrought high strength aluminium alloy containing 4.5 Zn, 2.0 Mg, and 0.12 Zr in wt.% have been examined as a function of the concentration of chromium in the range of 0.02∼0.2wt.%. It has been reported that the chromium forms Cr-dispersoids called E-phase(Al_(18)Mg₃Cr₂) in AI-Zn-Mg alloys. The size of these Cr-dispersoids is known to be depended on the content of chromium. The alloy containing 0.1 wt.% Cr has the small spherical Cr-dispersoids. However, the Cr-dispersoids are long rod-Like in the alloy with 0.2wt.% Cr. Because these Cr-dispersoids inhibit the motion of dislocations within the grain, the strength is increased. However, increment in strength is higher in the alloy with 0.1 wt.% Cr than in that with 0.2 wt.% Cr. The reason of the above phenomena may be resulted from the decrease of planar slip and increase cross slip due to the spherical Cr-dispersiods in the alloy with 0.1 wt.% Cr. The fracture toughness of the alloy depends on the shape and size of the Cr-dispersoids. The small spherical dispersoids increase the fracture toughness but the long rod-like dispersoids reduce it.
FDM 에 의한 응고해석시 계산기간 단축을 위한 Algorithm 연구
이재경,전주매,전기찬 ( Jae Kyung Lee,Ju Mae Jeon,Ghi Chan Jun ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.5
N/A Efficient algorithm for the solidification simulation by FDM is described from the practical point of views. If a proper time step Δt is selected, the calculation is accelerated by implicit algorithm with the temperature recovery method of latent heat method. The implicit routine in the calculation is processed by SOR method(relaxation factor=1.5, truncation error=l0^(-4)). The calculation is more accelerated by linear-interpolated explicite algorithm with a time step larger than the minimum value of the time step. This explicit method, which is applicable to the practical casting simulation problems, produces almost same results with about 40% faster calculation speed compared with the conventional explicit method.