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급냉 응고된 알루미늄 splats 의 미세조직에 미치는 기계적 합금화 효과
김완철(W . C . Kim),김동훈(T . H . Kim) 대한금속재료학회(구 대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.2
Effects of mechanical alloying process on the microstructure of Rapidly Solidified Al were studied by Varing the processing time. The mechanical alloying process can be divided into five stages; 1. The initial period. 2. The period of welding predominance. 3. The period of equiaxed particle formation. 4. The period of convolution of the lamellae. 5. Steady state. The establishment of steady state processing conditions characterized by microstructure and saturation hardness (120 HV) of composite is found to depend on the processing time. During the first 200 minutes of processing the microvickers hardness can be approximated by H = 60+ 0.33 t and strutural refinement rate of composite are as follows ε=(K/0.33)In(l+0.0055t)
급속냉각한 Al-(1 , 3 , 5)Cr 합금의 조직에 미치는 기계적 합금화의 영향
지태구,김완철 ( T . G . Jhee,W . C . Kim ) 한국열처리공학회 1993 熱處理工學會誌 Vol.6 No.4
Rapid solidified splats Al-(1, 3, 5Cr) Alloys were produced by atomization-splat quenching method. Effects of mechanical alloying on the structure and mechcanical properties of rapidly solidified Al-(1, 3, 5)Cr alloys were studied. Degree of mechanical alloying of Al-(1, 3, 5)Cr alloys can be determined by observing the microstructural refinement, microhardness and microstructure of Al-(l, 3, 5)Cr splats during processing. In the initial stage of mechanical alloying of the Al-(1, 3, 5)Cr splats fracturing of the grain boundaries occured first, followed after fracturing of zone A regions. Saturation hardness of Al-(1, 3, 5)Cr alloys increased proportionally with increasing concentration of the solute (Cr). Age hardening was not observed in these alloys. Decomposition temperature of Al-1Cr splats after mechanical alloying was higher than that of Al-5Cr splats. The density of Al_7 Cr precipitates increased proportionally with increasing chromium content, as a result, there was a transition to finely and spherically dispersed phase after mechanical alloying.
급속냉각한 Al-(1 , 3 , 5) Cr 합금 압출재의 조직과 기계적 성질에 미치는 기계적 합금화의 영향
지태구,김완철 ( T . G . Jhee,W . C . Kim ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.1
The structure and mechanical properties of the extruded specimens were investigated in rapid solidified Al-(1, 3, 5) Cr alloys after mechanical alloying. Finer lamellar microstructure could no longer be resolved in the bars obtained by extrusion of the spherical particles after 200min. of processing time. The structure of extruded bars are highly depended on the processing time of splats. The isothermal annealing of the extruded bars showed that all the alloys had good thermal stability up to 400℃ and did not show the recrystallization phenomena. Severe working of Al-(1, 3, 5)Cr splats produced a very fine grain size and substructural strengthening (high dislocation density and fine grain size). Effects of mechanical alloying on the thermal stability of the extruded bars Al-(1, 3, 5) Cr alloys decreases, with increasing Cr content. But the ultimate tensile Strength in the extruded bars increases with increasing Cr content.