Interfacial design and strengthening mechanisms of AZ91 alloy reinforced with in-situ reduced graphene oxide
Interfacial design and strengthening mechanisms of AZ91 alloy reinforced with in-situ reduced graphene oxide
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原位还原氧化石墨烯增强AZ91合金的界面设计和强化机制
DOI：
10.1016/j.matchar.2018.02.011
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发表时间：
2018-04
影响因子：
4.7
通讯作者：
Liu Yong
中科院分区：
文献类型：
--
作者：
Yuan Qiu-hong;Qiu Zhi-qiang;Zhou Guo-hua;Zeng Xiao-shu;Luo Lan;Rao Xi-Xin;Ding Yan;Liu Yong
本工作的重点是开发一种原位分散石墨烯的工艺，使其与镁合金基体具有良好的界面键。将氧化石墨烯（GO）均匀分散在AZ91粉末中，通过烧结工艺原位还原氧化石墨烯（RGO），成功地获得了石墨烯在基体中的均匀分布。通过透射电镜分析，界面产物纳米MgO可以显著提高RGO与α-Mg之间的界面结合强度。在MgO/α-Mg界面上首次明确了2¯00 MgO//1¯10 2¯α-Mg和011 MgO//2 4¯2 3¯α-Mg与半相干界面特征的取向关系，表明二者具有良好的晶格空间匹配。通过该工艺，含有0.5 wt%氧化石墨烯的复合材料的屈服强度和伸长率分别比未增强的AZ91合金提高了85.7%和61.4%。详细讨论了原位还原氧化石墨烯的强化机理。
This work highlights to develop an in-situ process to disperse uniformly graphene possessing good interfacial bonds with the matrix of Mg alloy. A homogeneous distribution of graphene in the matrix has been successfully obtained through in-situ reduction of graphene oxide (RGO) by sintering process after the graphene oxide (GO) was uniformly dispersed in AZ91 powders. The interface product nano-sized MgO can significantly improve the interfacial bonding strength between RGO and α-Mg with analysis by transmission electron microscopy. The orientation relationships of 2¯ 00 MgO//1¯ 10 2¯ α‐Mg and 011 MgO//2 4¯ 2 3¯ α‐Mg with the semi-coherent interface characteristics were clarified for the first time at the interface of MgO/α-Mg, suggesting a good lattice space matching. By employing such process, a composite containing 0.5 wt% of GO shows an 85.7% and 61.4% increase in yield strength and elongation, respectively, over unreinforced AZ91 alloy. The underlying strengthening mechanisms of in-situ reduced graphene oxide are discussed in detail.
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