319 高強度LPSO型Mg-Zn-Y合金の機械的特性に及ぼす組織変化の影響(アルミニウム合金およびマグネシウム合金の創製と加工(2),ものづくりにおける基礎研究と先端技術の融合)

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Mg-Zn-Y alloys were prepared by high frequency induction melting in an Ar atmosphere. The influence of extrusion condition on microstructure and mechanical properties of Mg_<96>Zn_2Y_2 (at. %) alloys by hot extrusion was investigated. Extruded specimens composed by recrystallization region and worked region and LPSO phase. Extrusion ram speed at 2.5 mm/s, yield stress and tensile strength showed the 395 MPa and 432 MPa at room temperature and 281 MPa and 311 MPa at 523 K, respectively. On the other hands, yield stress and tensile strength slightly decrease with increase of the recrystallization region due to the achieved temperature after the processing became higher than the recrystallization temperature of α-Mg phase after the extrusion. However, the strength did not show a remarkable decreased, and formability could be improved because the elongation improved. It was able to maintain high strength so that an LPSO phase restrained grain growth. It is important that the LPSO phase was fine dispersed in a α-Mg phase in the Mg_<96>Zn_2Y_2 alloys to maintain strength and elongation.
2010-11-27