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고강도 내마모 금속간화합물 / Al 기지 복합재료의 개발을 위한 기초연구
최답천,이경구,이호종,기회봉 ( Dap Chun Choi,Kyung Ku Lee,Ho Jong Lee,Whe Bong Ghi ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.3
N/A The interfacial phenomena between intermetallic compounds and Al matrix have been studied at 680℃ for various holding time under argon atmosphere. Model experiments were performed using Fe, Ni and Ti wire to observe the interfacial phenomena. The interfacial phenomena between intermetallic compounds and Al matrix were analysed by optical microscope, SEM and EDX. The results of EDX and XRD showed that the interfacial zones of intermetallic compounds/Al matrix were composed of several intermetallic layers. The reaction layer was varied with holding time and heating temperature. The investigation of interfacial zones in the specimen as a function of heat treatment time at 680℃ indicated that the best heat treatment condition for squeeze casting was 680℃ for 5min.
Fe-28at.%Al 합금의 미세조직과 기계적 성질에 미치는 Cr , Mo 및 B 의 영향
최답천,이연오,김관휴,박은식,이호종 ( Dap Chun Choi,Yeon O Lee,Kwan Hyu Kim,Eun Sik Park,Ho Jong Lee ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.5
N/A The effects of Cr, Mo or B additions were investigated on B2↔DO₃structural transition temperature (T_c) and mechanical properties of Fe-28at.%Al. The raw materials were arc-melted in vacuum and then subjected to the following heat-treatments to maximize the DO₃ordered structure : 1000℃/7days, slowly cooled to 500℃ and then held for 5 days. In the effect on the grain refinment, the addition of alloying element B was the most effective. The addition of Cr or Mo had little effect. When 1at.%Mo was added, T_c increase about 30℃, but Cr had a very little effect on T_c. On the contrary, when B was added, T_c was apt to come down minutely. In the additional effect of alloying element on the mechanical properties, Cr was apt to decrease the microvickers hardness and yield strength, Mo and B didn`t have much effect. In the case of compressure strength test, the effect of the environment on the yield strength was contrary to the result of the tensile strength test.
Cr 과 Si 이 복합 첨가된 TiAl 금속간화합물의 미세조직 및 기계적 성질에 관한 연구
최답천,이호종,이병택 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.8
In order to investigate the effects of Cr and Si additions in γ-TiAl alloy, the microstructure and mechanical properties before and after heat treatment were studied. Simultaneous additions of Cr and Si were more effective in stabilizing the lamellar structure of TiAl alloys after heat treatment. The stoichiometric composition of the precipitates formed in the alloy with 0.5% Si addition was estimated to be Ti_5(Si, Al)₃, and that with 3%Cr0.5%Si addition to be(Ti, Cr)_5(Si,Al)₃. Good mechanical properties could be achieved by simultaneous addition of Cr and Si. Tensile tests before and after heat treatment showed that maximum yield strength was obtained from the alloy with 1%Cr0.5%Si addition and while the highest elongation was observed by 1%Cr0.25%Si addition before heat treatment. However, the alloy with 2%Cr0.5%Si addition showed the highest elongation after heat treatment.