Research on in situ Al-Cr/Al composites fabricated by ultrasonic aided casting technology

• Published in: Materials research innovations 2014-07, Vol.18 (sup4), p.S4-473-S4-478
• Main Authors: Zhao, L. Z., Jiao, Y., Wang, Q. L., Zhang, J., Zhao, M. J.
• Format: Article
• Language: English
• Subjects: Aluminum; Damping capacity; Electronics; In situ reaction; Intermetallic compounds; Intermetallics; Mechanical properties; Microstructure; Particulate composites; Reinforcement; Tensile strength; Ultrasonic aided casting technology; Ultrasonic vibration
• ISSN: 1432-8917; 1433-075X
• DOI: 10.1179/1432891714Z.000000000722

In situ Al-Cr/Al composites were prepared by ultrasonic vibration aided casting method in this paper, and the effects of ultrasonic time on microstructure, mechanical properties and damping capacities of Al-Cr/Al composite were systematically investigated by X-ray diffraction, SEM, electronic universal testing machine and the torsion pendulum internal friction tester. The results show that the ultrasonic vibration significantly refines the Al-Cr intermetallic compound reinforcement. The Al-Cr hybrid intermetallic compound reinforcements are found in the matrix, the size of in situ hybrid reinforcement has minimum value and the tensile strength of Al-Cr/Al composite has maximum value with the increase in the ultrasonic time. When the ultrasonic power and treatment time are 1 kW and 10 min, the tensile strength and elongation reach 188 MPa and 8·4% respectively, 61·48 and 52·72% greater than those of composites without ultrasonic assistance respectively. With high energy ultrasonic vibration, Q −1 reached 5·03×10 −2 , which is ∼24 times than that of the in situ Al-Cr/Al composites without ultrasound vibration.