NDTnet 1998 Aug, Vol.3 No.8

Full-Text - Abstract

Aluminium and its alloys as well as the Al based metal matrix composites gain increasinginterest as the light weight material for transportation structures. In the sense of the simultaneous engineering, the development of nondestrucive techniques to characterize the structural state and to evaluate the properties of a material has to go along with the improvements of the casting, rolling, shaping and ioininq processes.

The contribution describes the research and developments towards the ultrasonic characterization of microstructure and the evaluation of mechanical properties and discusses the chances of their use for process control.

• Ultrasonic backscattering technique is applied to visualize the distribution of ceramic reinforcements in automotive pistons and con-rods made of Al based metal matrix composites.
• Ultrasonic velocities are measured to evaluate the volume content on reinforcement.
• Both measuring quantities are used to visualize and to characterize the burrs in Al- hollow castings.
• The texture in Al sheets is evaluated and the earing parameter is determined from measurements of ultrasonic times of fight as function of the ultrasonic propagation direction.Using times of flight of different ultrasonic waves the residual stress state in plates and welded parts is evaluated.
• Strong correlations are found between the acousto-elastic constant of the materials and the yield strengths of different Al alloys.

Abstract Source:
Book of Abstracts, 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN: 87-986898-0-00

Full-Text Source:
Proceedings of the 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN:

Publication Contact:
7th ECNDT, Park Alle 345, DK-2605 Broendby, Denmark, Fax: +45 46 26 70 11, Email: 101373.3414@compuserve.com