The Effect of Si and Extrusion Process on the Microstructure and Tensile Properties of Mg-Mg₂Si Composite

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• 作者：S. Mosleh^a ; M. Emamy^a ; ^{emamy@ut.ac.ir" class="auth_mail" title="E-mail the corresponding author} ; H. Majdi^b
• 关键词：Mg-Mg2Si composite ; Extrusion ratio ; Tensile properties.
• 刊名：Procedia Materials Science
• 出版年：2015
• 出版时间：2015
• 年：2015
• 卷：11
• 期：Complete
• 页码：79-83
• 全文大小：2247 K

文摘

This investigation has been carried out to study the influence of extrusion process on microstructure and tensile properties of Mg-Mg₂Si composite with different amounts of Si (3, 5 and 7 wt.%). Microstructural examination was carried out using optical microscopy (OM). The cast specimens were extruded at 350 °C at different extrusion ratios (6:1, 12:1 and 18:1). The results showed that the specimens with lower Si contents, have higher ultimate tensile strength (UTS) and tensile elongation values. Moreover, there was a considerable improvement in tensile properties for the specimens extruded with the ratio of 12:1 and 18:1 in comparison to the specimens of 6:1. This can be attributed to the significant reduction in size of primary Mg₂Si particles from more than 200 μm to 20 μm, 10 μm and 5 μm after extrusion with the ratio of 6:1, 12:1 and 18:1, respectively. The highest UTS values were found to be 265 MPa for extruded with 1:18 ratio of Mg-3Si composite.