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New Aluminum-Based Amorphous Alloys with High Strength and Good Ductility
Inoue,Akihisa,Masumoto,Tsuyoshi 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.8
New Al-based amorphous alloys with high strength, good ductility and high corrosion resistance have been produced by liquid quenching in Al-Y-Ni and Al-La-Ni systems. The tensile fracture strength (σ_f) and Vickers hardness reach 1140 MPa and 300 DPN for Al_(87)Y_8Ni_5 and 1080 Mpa and 260 DPN for Al_(87)La_8Ni_5. The specific strengths, defined by the ratio of σ₁to density, are as high as 34 to 38, which is much higher than those for conventional alloy steels, Al-based alloys, and Ti-based alloys. These new Al-base amorphous alloys are effected to be used in many applications as a new type of high-strength material with low density and high corrosion resistance.
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.
강일구,김희중,증본건 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.5
Alloying effects on the crystallization temperature and the crystallization process of Fe-Cr-C-B alloys were studied by DSC and X-ray diffractometer. The crystallization temperature linearly increased with increasing the concentration of Cr and metalloids. The activation energy for crystallization was in the range of 83-97 ㎉/㏖, and its dependence to composition was similar to that of the crystallization temperature. Three crystallization processes of primary, eutectic and polymorphic were occurred with alloy composition. The final stable crystalline phases were α-(Fe, Cr) (bcc), (Fe, Cr)₃B(orthorhombic) and (Fe, Cr),B (tetragonal) in Fe_(47)Cr_(35)B_(18) alloy, (Fe, Cr)₃(C, B) (orthorhombic) in Fe_(41)Cr_(35)C_(12)B_(12) alloy, and α-(Fe, Cr)(bcc) and (Fe, Cr)₃ (C, B) (orthorhombic) in all Fe-Cr-C-B alloys except Fe_(41)Cr_(35)C_(12)B_(12) alloy.