Direct-chilling casting of Mg alloy under electromagnetic and ultrasonic combined field

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. B07; pp. 297 - 305
• Main Author: 崔建忠 张志强 乐启炽
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2010; Key Laboratory of Electromagnetic Processing of Materials of Ministry of Education,Northeastern University,Shenyang 110004,China
• Subjects: Alloying elements; Billet casting; DC casting; Direct chill casting; Grains; Ingot casting; Ingots; low frequency electromagnetic field; Magnesium base alloys; Mechanical properties; Mg alloy; ultrasonic field; 低频电磁场; 分布均匀性; 力学性能; 合金元素; 晶粒细化; 电磁波; 超声波; 铸造镁合金; low frequency electromagnetic field; DC casting; Mg alloy; ultrasonic field
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(10)60487-6

The effects of low frequency electromagnetic （LFEC） field and ultrasonic （US） field on the microstructures, macrosegregation of alloying elements and the mechanical properties of DC cast AZ80 alloy were studied. The results show that both LFEC and US fields can refine the grains of the billets, which results in the increase in mechanical properties and uniformity of alloying element distribution. The effective refinement takes place on the edge of ingots when LFEC field is applied, while in the center of billets when field US is adopted. Combined the characteristics of LFEC and US fields, a new process for direct-chilling （DC） casting of Mg-electromagnetic-ultrasonic （ECUS） casting is developed, by which the grains are refined significantly and are more uniform in the whole ingots, and the mechanical properties of the ingots are improved.