A mechanism of pick-up formation on 6063 aluminum alloy extrusions.

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  • ６０６３アルミニウム合金押出材のピックアップ欠陥発生機構
  • 6063 アルミニウム ゴウキン オシダシザイ ノ ピックアップ ケッカン ハッセイ キコウ

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A mechanism of pick-up formation on the surface of extrusions was discussed in this work. First, a quantitative evaluation method was established to determine the transformation ratio of α–AlFeSi (α ratio) from β–AlFeSi in 6063 aluminum alloy billets. By applying the integrated intensity technique of X-ray diffraction peak to study the effect of the α ratio on the pick-up formation, it became clear that the segregation zones in the billet surface affected the pick-up formation. When the α ratio at the billet surface was below 10%, heavy pick-up were observed on the extruded surface even though the α ratio was 100% at the billet center. In the surface of low α ratio billets, Mg2Si compounds existed around β–AlFeSi particles and it was observed that local melting occurred around them at a temperature between 570 and 580°C. Furthermore, pick-up defects were not found with low magnesium content billets although they showed the α ratio below 10% at the surface. Thus it was considered that pick-up defects occurred due to the peritectic reaction of Al, Mg2Si and β–AlFeSi at 576°C.

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