2743 Mg-7〜9%Al-Zn-RE-Ca合金押出材のミクロ組織と機械的性質(S29-1 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技術(1),S29 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技術)

概要

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Authors attempt to improve proof stresses and their anisotropic properties of Mg-Al-Zn wrought alloys by microstructural controls utilizing dynamic recrystallization and dynamic precipitation during hot extrusion. In the alloy specimens extruded at lower temperatures increasing Al and Zn contents enhance dynamic recrystallization and dynamic precipitation, resulting in grain refinement and large amount of Mg_<17> Al_<12> precipitates. As a result, the extruded Mg-9%Al-1%Zn alloy specimen shows high tensile strength of 370MPa, 0.2% tensile proof stress of 240MPa and moderate elongation of 20%, which are comparable to those of T5-treated 6N01 Al extruded alloy. Furthermore, a ratio of compressive proof stress to tensile proof stress of the as-extruded specimen improves up to a higher ratio of 0.9 than that of Mg-3%Al-1%Zn alloy specimen with no precipitation, 0.5, due to prevention of tensile twin, which easily occurs during compressive deformation even under a low applied stress perpendicular to the extrusion direction, by dynamic precipitation of Mg_<17> Al_<12> phase.
社団法人日本機械学会の論文
2006-09-15