title: Study on hydrogen removal of AZ91 alloys using ultrasonic argon degassing process.
abstract: Argon degassing, ultrasonic degassing and a novel ultrasonic argon degassing treatment were applied for the hydrogen removal of AZ91 magnesium alloy. The hydrogen concentration, microstructures and mechanical properties have also been investigated. AZ91 alloys contains a high hydrogen concentration. The mechanical properties of the as-cast alloy are much improved using degassing process, which should be mainly attributed to the hydrogen removal. Among the three degassing process, the ultrasonic argon treatment is a high efficient process both for hydrogen removal and microstructure refining. One hand, ultrasonic wave could break up the purged argon bubble to improve the degassing efficiency of these bubbles. On the other hand, ultrasound could also generate many cavitation bubbles in the melt, which should account for the microstructure refinement. The ultrasonic argon treatment involves dynamics between the ascending argon bubbles and ultrasonic effects, such as cavitation and streaming, etc.
authors: Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, 314 Mailbox, Shenyang 110819, People's Republic of China.
authors: Xuan
authors: X
authors: Liu
authors: Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, 314 Mailbox, Shenyang 110819, People's Republic of China.
authors: Zhiqiang
authors: Z
authors: Zhang
authors: Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, 314 Mailbox, Shenyang 110819, People's Republic of China.
authors: Wenyi
authors: W
authors: Hu
authors: Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, 314 Mailbox, Shenyang 110819, People's Republic of China. Electronic address: qichil@mail.neu.edu.cn.
authors: Qichi
authors: Q
authors: Le
authors: Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, 314 Mailbox, Shenyang 110819, People's Republic of China.
authors: Lei
authors: L
authors: Bao
authors: Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, 314 Mailbox, Shenyang 110819, People's Republic of China.
authors: Jianzhong
authors: J
authors: Cui
authors: Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, 314 Mailbox, Shenyang 110819, People's Republic of China.
authors: Jiajia
authors: J
authors: Jiang
keywords: Hydrogen removal; Magnesium alloys; Mechanical properties; Microstructures; Ultrasonic argon degassing