THE QUANTITATIVE ANALYSIS OF α-AlFeSi RATIO IN A 6063 ALUMINUM ALLOY BILLET BY X-RAY DIFFRACTION

摘要

The integrated intensity technique of X-ray diffraction (XRD) peak was applied to the estimation of the transformation ratio of α-AlFeSi (α ratio) at the billet surface of 6063 aluminum alloy to study the effect of the α ratio on pick-up formation. As a result, it became clear that the segregation zones affected the pick-up formation. When the α ratio at the billet surface was below 10% in spite of 100% at the billet center, heavy pick-up were observed on the extruded surface. In low α ratio billets, Mg2Si compounds were formed around β-AlFeSi particles. Thus it was considered that pick-up defects occurred due to peritectic reaction of Al, Mg_2Si and β-AlFeSi at 576°C.