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Application of G-L Dislocation Model in Low Frequency Damping Capacities of AZ91D and SiCw/AZ91D Composites

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Abstract:

The low frequency damping capacities of commercial cast AZ91D, squeeze cast AZ91D alloy and SiCw/AZ91D composite were studied using dynamic mechanical analyzer (DMA). The obtained strain amplitude dependent damping could be divided into two regions. In the region of small strain amplitude, the damping capacity was independent of the amplitude. While at high strain region, the damping capacity increased rapidly with increasing of strain amplitude. The G-L dislocation model was used to explain the damping capacity, and the differences of the distance between the weak and strong pinning points were discussed. The microstructures of the alloys and composites were observed and coincided with the analysis results according to G-L dislocation model.

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Periodical:

Materials Science Forum (Volumes 546-549)

Pages:

495-498

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.546-549.495

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Online since:

May 2007

Authors:

Y.K. Zhang, Xiao Shi Hu, Kun Wu, Ming Yi Zheng

Keywords:

AZ91D, Damping Capacity, Dislocation, SiCw/AZ91D Composites

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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