408 AZ31マグネシウム合金展伸材の再結晶粒径に及ぼす圧延方向の影響(オーガナイズドセッション : 超塑性と材料および造形法)

概要

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Grain refinement is known to be a method to improve the poor plastic formability at the room temperature in magnesium alloys. In the present study, as an attempt to develop a convenient grain refinement method, wrought products of a convenient AZ31 alloy have been further cold-rolled and finally working annealed. The influence of the angle between the original wrought direction and the cold-rolling direction has been also investigated. A hot-rolled sheet and an extruded bar were cold-rolled by 15% directly and after annealing at 250℃ for 1h, respectively, subsequently annealed at 250℃ for 1h, and then subjected to be optical microscopy. The present process consisting of cold rolling and annealing was found to be effective to refine the grain size. Grain refinement became marked when the angle between the original working direction and the cold-rolling direction increased. It was confirmed that yield strength and hardness increased with decreasing grain size.
一般社団法人日本機械学会の論文
2001-09-20