Study on the Porosity in Al-Zn-Mg-Cu High Strength Alloy DC Ingot

• Published in: Materials Science Forum Vol. 879; pp. 790 - 794
• Main Authors: Guo, Shi Jie, Nagaumi, Hiromi, Jiang, Hui Xue, Zou, Chun
• Format: Journal Article
• Language: English
• Published: Pfaffikon Trans Tech Publications Ltd 15.11.2016
• Subjects: CASTING; CHILL CASTING; Chill strengthening; Cooling rate; Copper; Cross sections; Direct chill casting; High strength alloys; INCLUSIONS; Ingot casting; INGOTS; Magnesium; Nonmetallic inclusions; Porosity; Thickness; X ray microtomography; Zinc; DC Ingot; Al-Zn-Mg-Cu Alloy; Porosity
• ISBN: 3035711291; 9783035711295
• ISSN: 0255-5476; 1662-9752; 1662-9752
• DOI: 10.4028/www.scientific.net/MSF.879.790

An Al-Zn-Mg-Cu high strength alloy ingot produced by Direct-Chill casting was used in this study. The distribution of porosity in the cross section of the DC ingot was investigated by the precision density method (Archimeds’ principle), also X-ray microtomography technique was used to quantitatively analyze porosities in typical positions. The pattern in the cross section as well as in the thickness and width direction was obtained. The results show that: in the cross section of the ingot, porosity was increasing gradually from the surface to the center of the ingot; porosity shows an overall escalating trend from the surface to the center of the ingot both in thickness direction and in width direction; porosity was closely related to the cooling rate in the ingot; oxide inclusions have an effect on the formation of porosity to some extent.