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분사주조법에 의한 al-Ni-Ce-Mg 계 비정질합금의 제조와 특성
정상명구,배차헌,정해용,하촌능인 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.8
The optimum composition of Al-Ni-Ce-Mg alloys forming the amorphous and amorphous plus fcc-Al phase was investigated by the measurement of both hardness, maximum bending strain at fracture(ε_(Bf)), Differential Scanning Calorimetry(DSC) and X-ray diffraction for the as-quenched ribbons produced by melt-spinning. As a results, the alloy ribbon with optimum composition and a mixed phase was Al_(86)Ni_6Ce₄Mg₄. Al_(86)Ni_6Ce₄Mg₄ bulk alloy was produced by extrusion at different temperature of the rapidly solidified powders produced by helium gas atomization. The tensile strength and elongation at room temperature for Al_(86)Ni_6Ce₄Mg₄ bulk alloy extruded at 450℃ were 750MPa and 7.5%, respectively.
김영환,증본건,조형호,김우열,정상명구 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.9
An Al_(88)Y₂Ni_(10) amorphus alloy was found to exhibit a Large elongation reaching about 30% in the low temperature range of 450 to 475K. The temperature range agrees well with that where a lot of the primary fcc-Al particles with a ultrafine grain size precipitate homogeneously. It is therefore concluded that the appearance of the large elongation is due to a crystallization-induced plasticity phenomenon. The new phenomenon may be interpreted to occur through the sequent process of inhomogeneous deformation along shear plane, followed by preferential precipitation of Al particles on the shear plane resulting from the deformation-induced increase in temperature and then propagation of the deformation site to other site resulting from the precipitation-induced strengthening in the deformed area.