Hot extrusion of SiCp/AZ91 Mg matrix composites

SiC particles reinforced AZ91 Mg matrix composites (SiCp/AZ91) with SiC volume fractions of 5%, 10% and 15% were fabricated by stir casting. After T4 treatment, these composites were extruded at 350 °C with an extrusion ratio of 12:1. In the as-cast composite, particles segregated at a microscopic s...

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Bibliographic Details
Published inTransactions of Nonferrous Metals Society of China Vol. 22; no. 8; pp. 1912 - 1917
Main Authors WANG, Xiao-jun, HU, Xiao-shi, NIE, Kai-bo, WU, Kun, ZHENG, Ming-yi
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.08.2012
Subjects
AZ91 magnesium alloy
extrusion
Mg matrix composites
SiCp
volume fraction
Mg matrix composites
volume fraction
SiCp
AZ91 magnesium alloy
extrusion
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Summary:SiC particles reinforced AZ91 Mg matrix composites (SiCp/AZ91) with SiC volume fractions of 5%, 10% and 15% were fabricated by stir casting. After T4 treatment, these composites were extruded at 350 °C with an extrusion ratio of 12:1. In the as-cast composite, particles segregated at a microscopic scale within the intergranular regions. Hot extrusion almost eliminated this particle aggregation and improved the particle distribution of the composites. In addition, extrusion refined the grains of matrix. The results show that hot extrusion significantly improves the mechanical properties of the composites. In the as-extruded composite, with the increase of SiCp contents, the grain size of the extruded composites decreases, the strength and elastic modulus increase but the elongation decreases.
ISSN:1003-6326
DOI:10.1016/S1003-6326(11)61407-6