Formabilities of AZ31, AZ61 and AZ80 Magnesium Alloy Sheets and<br>Mechanical Properties of Formed Parts by Friction Stir Incremental Forming

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  • 摩擦撹拌インクリメンタルフォーミング法による<br>AZ系マグネシウム合金板の成形性と加工部の機械的特性
  • マサツ カクハン インクリメンタル フォーミングホウ ニ ヨル AZケイ マグネシウム ゴウキンバン ノ セイケイセイ ト カコウブ ノ キカイテキ トクセイ マサツ カクハン インクリメンタル フォーミングホウ ノ カイハツ ダイ2ホウ
  • — Development of Friction Stir Incremental Forming 2nd Report —
  • — 摩擦撹拌インクリメンタルフォーミング法の開発　第2報 —

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Abstract

Magnesium alloys have poor ductility and it is difficult to manufacture magnesium alloy parts at room temperature. The authors have developed friction stir incremental forming method to form magnesium alloy sheets without heating and reported on the formability of AZ31-O sheets with a 0.5 mm thickness at room temperature. In this study, friction stir incremental forming was applied to the forming of AZ61 and AZ80 magnesium alloy sheets, which are more difficult to deform plastically at room temperature than AZ31, and the formabilities of AZ61 and AZ80 magnesium alloy sheets were investigated. Vickers hardness test and tension test of the formed parts were also carried out. From the experimental results, the AZ61 and AZ80 sheets were successively formed into a pyramidal frustum shape with minimum half apex angles of 30° and 40°, respectively. These results indicate 100% and 56% elongations although the fracture elongations of those sheets in tension test at room temperature were only 17% and 24%, respectively. The Vickers hardnesses and tensile strengths of AZ31, AZ61 and AZ80 formed parts were increased or decreased less than 20% compared with the unformed ones.

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