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급속응고된 Al-10wt% Ti 합금의 미세조직과 열안정성에 대한 연구
김원태,오규환,금동화,김혜성,이희춘 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.10
Al-10wt% Ti alloy was rapidly solidified by N₂gas atomization process, and the resulting alloy powders were consolidated by hot extrusion with an extrusion ratio of 17 : 1. The characteristics of the powders and the microstructures of the powders and extrudates have been examined by using a combination of particle size analyser, X-ray diffractometer, and optical, scanning electron and transmission electron microscopes. At-10wt% Ti powders show a spherical shape with mean particle size of 50㎛, and a microstructure of equiaxed α-Al grain of 2-3㎛ with Al₃Ti particles. Powders smaller than 44㎛ consist of α-Al, Ll₂metastable Al₃Ti and DO_(22) equilibrium Al₃Ti. With increasing th powder size, metastable Al₃Ti particles disappears and equilibrium Al₃Ti particles with a petal like shape become dominant. The metastable and equilibrium Al³,Ti particles show following orientation relationships with the surrounding α-Al matrix :[100]_(Al)//[001]DO_(22)-Al₃Ti and[010]Ll₂-Al₃Ti;[100]_(A1)//[100]Ll₂-Al₃Ti and[010]_(Al)//[010]Ll₂-Al₃Ti Extrudates show a uniform show a uniform distribution of equilibrium Al₃Ti particles in α-Al matrix with grain size of 2㎛