The Effects of ZnO Particles on the Grain Refinement and Mechanical Properties of AZ31 Magnesium Alloys

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• 作者：Xuan Liu ; Zhiqiang Zhang ; Qichi Le ; Lei Bao
• 关键词：Magnesium alloys ; ZnO particles ; Mechanical properties ; Grain refinement
• 刊名：Transactions of the Indian Institute of Metals
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：69
• 期：10
• 页码：1911-1918
• 全文大小：3,411 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Materials Science, general
  Tribology, Corrosion and Coatings
  
• 出版者：Springer India
• ISSN：0975-1645
• 卷排序：69

文摘

The grain refinement and mechanical properties of AZ31 alloy with ZnO additions were investigated using suction casting method. ZnO addition could provide a more pronounced grain refinement and strengthening effects to the AZ31 alloy than Zn solute addition did. The grain size were well refined from 325 to 220 μm with 1.3 wt% ZnO addition. The grain refining mechanism of ZnO particles (~200 nm) mainly arose from the transformed Zn solute restricting the grain growth and the micro convection by the reaction enthalpy clearing solute suppressed nucleation effects. Meanwhile, the ZnO addition provided uniform solute field and steadly ensured a fine-grain and uniform second phase distribution. With 1.3 wt% ZnO addition, the ultimate tensile strength and yielding tensile strength of suction cast AZ31 alloy were as high as 205 and 66 MPa, respectively. The refining and strengthening mechanism have been discussed in detail.