冷間圧延とその後の焼鈍によるマグネシウム合金展伸材AZ31の再結晶粒微細化

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タイトル別名
  • Refinement of Recrystallized Grains in Wrought Magnesium Alloy AZ31 through Cold Rolling and Subsequent Annealing
  • レイカン アツエン ト ソノゴ ノ ヤキナマシ ニ ヨル マグネシウム ゴウキンテンシンザイ AZ31 ノ サイケッショウリュウ ビサイカ

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Grain refinement is known to be an effective method to improve the poor ductility at room temperature, as well as to achieve an excellent formability caused by superplasticity at high temperatures, in magnesium alloys. In the present study, as an attempt to develop a convenient grain refinement method, wrought products of a commercial magnesium alloy AZ31 have been subjected to further cold rolling and subsequent annealing. The influence of the angle between the original working direction and the cold-rolling direction on the grain size has also been investigated. A hot-rolled sheet and an extruded bar were cold-rolled by 15% directly and after annealing at 250°C for 1 h, respectively, subsequently annealed at 250°C for 1 h, and then subjected to optical microscopy. The present process consisting of cold rolling and subsequent annealing was found to be effective to refine the grain size. Grain refinement became more marked when the angle between the original working direction and the cold-rolling direction increased. Yield strength and hardness were confirmed to increase with decreasing grain size. The minimum grain size obtained in the present study was 6.4 μm, which seemed to be sufficiently fine for the occurrence of superplasticity.

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