In-line ultrasonic monitoring of semi-solid magnesium die casting process

• Published in: Ultrasonics Vol. 41; no. 10; pp. 777 - 784
• Main Authors: Jen, C.-K., Moisan, J.-F., Zheng, C.-Q., Loong, C.A., Kruger, S.E., Shehata, M.T., Essadiqi, E.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-05-2004; Elsevier Science
• Subjects: Acoustics; Die-casting; Exact sciences and technology; Fundamental areas of phenomenology (including applications); High temperature; Magnesium; Physics; Semi-solid; Ultrasonic sensor; Ultrasonics, quantum acoustics, and physical effects of sound; 43.35.Cg; 81.20.Hv; Ultrasonic sensor; 43.35.Zc; High temperature; Magnesium; Die-casting; Semi-solid; 43.20.Ye; Acoustic measurement; Propagation velocity; Speed measurement; Semi solid state; Wave damping; Steel; Surface treatment; Pressure die casting; Ultrasonic control; Embedded transducer; Laser ultrasonics; Microstructure; Non destructive test; Monitoring; Non contact measurement
• ISSN: 0041-624X; 1874-9968
• DOI: 10.1016/j.ultras.2004.02.014

Ultrasonic velocity and attenuation measurements in AZ91D magnesium (Mg) alloy with dendritic, rosette and globular microstructures were performed at elevated temperatures using a non-contact laser-ultrasonic technique. It was found that the ultrasonic velocity in the globular microstructure and the ultrasonic attenuation in the dendritic microstructure are the highest among the three microstructures. An ultrasonic clad steel buffer rod sensor embedded in the die has been used to monitor the semi-solid die casting process in-line for the AZ91D Mg alloy. This probe monitored the completion of the die filling, the release of the pressure, the opening of the die, part detachment, solidification of the part, the averaged temperature of the die and the part.