5083アルミニウム合金の機械的性質に及ぼす圧延組織とβ相の影響 The effects of the β-phase and rolled material's microstructure on the mechanical properties of 5083 aluminum alloy
The mechanical properties of the commercial 5083 aluminum alloy specimen cut in the direction parallel to the short-transverse direction of the plate were measured by tensile and Charpy impact tests at 77 K and 300 K in order to study the generation behavior of laminated cracks. Changes in the mechanical properties with the long-term aging were also investigated in view of precipitation of β–phase. The specimens were solution treated at 673 K for 7.2×10<sup>3</sup> s, water quenched and aged subsequently at 453 K for up to 10<sup>7</sup> s. The absorbed energies during the impact fracture tests showed a lower value than those of the specimens cut in the other directions, suggesting the reason for laminated cracking in the longitudinal direction. The absorbed energy, tensile strength and fracture elongation decreased steeply for the specimens aged for longer than 10<sup>6</sup> s, corresponding to the marked precipitation of β–phase. According to the results of fractographic observation, flat surfaces in brittle manner were obtained for aged specimens having low mechanical properties.
軽金属 46(5), 237-242, 1996-05-30
The Japan Institute of Light Metals
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塑性と加工 38(439), 684-686, 1997-08-25