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CuO涂覆Mg2B2O5晶須增強(qiáng)鎂基復(fù)合材料界面結(jié)構(gòu)研究
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國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(2011CB612200)；國家科技部國際科技合作計(jì)劃項(xiàng)目( 2009DFA51830 )


Interfacial Structure of CuO-Coated Mg2B2O5 Whisker Reinforced Magnesium Matrix Composite
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    摘要:

    采用溶膠-凝膠法制備的CuO涂覆Mg2B2O5晶須改善了晶須增強(qiáng)鎂基復(fù)合材料的界面。利用X 射線衍射儀、掃描電鏡和透射電子顯微鏡對CuO涂覆Mg2B2O5晶須和鎂基復(fù)合材料分別進(jìn)行物相分析、形貌觀察和界面結(jié)構(gòu)分析。結(jié)果表明：CuO成功地涂覆在了Mg2B2O5晶須上，CuO涂覆Mg2B2O5晶須增強(qiáng)鎂基復(fù)合材料的界面相為MgCu2和MgO相，來源于CuO和基體的界面反應(yīng)產(chǎn)物；基體析出相MgZn2在晶須兩側(cè)平行生長，在特定位置和晶須具有一定的晶體學(xué)位向關(guān)系：[001] Mg2B2O5//[53] MgZn2和(100) Mg2B2O5//(011) MgZn2；CuO涂覆Mg2B2O5晶須增強(qiáng)鎂基復(fù)合材料的抗拉強(qiáng)度和伸長率分別提高了37.6%和35.7% 。

    Abstract:

    A sol-gel method was used to improve the interface of whisker reinforced magnesium matrix composite via coating CuO on the surface of Mg2B2O5 whisker. Phase, morphology and interfacial characteristics of CuO-coated Mg2B2O5 whisker and magnesium matrix were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. Results indicate that CuO is coated on the surface of the Mg2B2O5 whisker and the interfacial products are MgCu2 and MgO in the CuO-coated Mg2B2O5 whisker reinforced magnesium matrix composite, which result from the interfacial reaction between the magnesium and CuO. The precipitate phase MgZn2 parallel grows on the both sides of whisker and has the crystallographic orientation relationship at the special position between the MgZn2 and Mg2B2O5 whisker, namely, [001] Mg2B2O5//[53] MgZn2 and (100) Mg2B2O5//(011)MgZn2. The ultimate tensile strength and the elongation of the CuO-coated Mg2B2O5 whisker reinforced composite have increased by 37.6% and 35.7%, respectively.

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韓 麗,金培鵬,陳善華,王金輝. CuO涂覆Mg2B2O5晶須增強(qiáng)鎂基復(fù)合材料界面結(jié)構(gòu)研究[J].稀有金屬材料與工程,2013,42(6):1221~1225.[Han Li, Jin Peipeng, Chen Shanhua, Wang Jinhui. Interfacial Structure of CuO-Coated Mg2B2O5 Whisker Reinforced Magnesium Matrix Composite[J]. Rare Metal Materials and Engineering,2013,42(6):1221~1225.]
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  • 收稿日期:2012-06-15
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