Authors: Xuewei Zhu Richu Wang Chaoqun Peng Wenshui Liu Jian Peng
Publish Date: 2014/08/22
Volume: 25, Issue: 11, Pages: 4889-4895
Abstract
The hypereutectic Al–27Si mass fraction alloys are prepared by spray deposition and extrusion The effect of thermal aging process on the coefficient of thermal expansion CTE and microstructure of the Al–27Si alloys are investigated The results show that the distribution of Si particles in αAl matrix is uniform and the primary Si phase grows gradually during the process of thermal aging The CTE between room temperature to 100 °C increases gradually with the ascending of aging temperature attributed to the relaxation of residual thermal stress and the coarsening of primary Si phases in the alloys On the other hand the CTE increases linearly as the cycling temperature increases up to 500 °C and the measured values are in good agreement with the Kerner model
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