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액상교반법에 의한 AI/TiCp 복합재료의 제조에 관한 연구(I)
임종국,김명한,최재하,Im, Jong-Guk,Kim, Myeong-Han,Choe, Jae-Ha 한국재료학회 1993 한국재료학회지 Vol.3 No.5
TiC 입자를 강화재로 한 AI금속기지 복합재료를 액상교반법으로 제조하는데 따른 제조조건과 물성특성과의 관계를 조사하였다. TiC 입자는 중량비 10%를 첨가하였으며, 젖음성을 향상시키기 위하여 1.5wt%의 Mg을 첨가하였다. TiC입자 첨가에 의하여 내마모 특성, 인장강도, 경도 등이 증가 되었으나 과도한 교반은 기계적 특성을 저하시켰다. 본 실험조건에서 교반 속도의 최적조건은 500rpm이었다. Wetting agent로서 첨가한 Mg은 기지에 고루 분산하였다. The mecllanical properties of AI/TiCp composite fabrication by liquid mixing was investigat ed. The composites, containing 10 wt% Tic. were producwi using induction furnace with mechanical stirring. The amounts of' 1.5wt% Mg were, added to wetting agents. Thr presence of aluminum in TiC composites showed rnhanced strengrh without loss of ductility at room and clrvated temperatures. Espe cially, wear resistance was found to dramatically irnprovc. I3ul excess stirring d~terrninrd the mect~ani~ cal properties. Approximate values at present work were 500 rpm. There was no inrerfacial reaction of any kind and the interface remains clearly deineated.
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임성혁,임종국,김경환,최재하 ( S . H . Im,S . K . Rhim,K . H . Kim,J . H . Choi ) 한국열처리공학회 1997 熱處理工學會誌 Vol.10 No.3
The-steady-state creep mechanism and behavior of Zircaloy-4 used as cladding materials in PWR have been investigated in air environment over the temp. ranges from 600 to 645℃ and stress ranges from 4 to 7㎏/㎟. The stress exponents for the creep deformation of this alloy, n were decreased 4.81, 4.71, 4.64, and 4.56 at 600, 615, 630 and 645℃, respectively; the stress exponents decreased with increasing the temperature and got closer to about 5. The apparent activation energies, Q, were 62.1, 60.0, 57.9 and 55.4 ㎉/mole at stresses of 4, 5, 6, 7㎏/㎟, respectively; the activation energies decreased with increasing the stress and were close to those of volume self diffusion of Zr in Zr-Sn-Fe-Cr system. In results, it can be considered that the creep deformation for Zircaloy-4 was controlled by the dislocation climb over the ranges of this experimental conditions. Larson-Miller parameter, P, for the crept specimens was obtained as P=(T+460)(logt_r+23). The failure plane observed by SEM slightly showed up intergranular fracture at this experiment ranges. However, it was essentially dominated by the dimple phenomenon, which was a characteristics of the transgranular fracture.
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