摘要
采用溶胶-凝胶法制备的CuO涂覆Mg2B2O5晶须改善了晶须增强镁基复合材料的界面。利用X射线衍射仪、扫描电镜和透射电子显微镜对CuO涂覆Mg2B2O5晶须和镁基复合材料分别进行物相分析、形貌观察和界面结构分析。结果表明:CuO成功地涂覆在了Mg2B2O5晶须上,CuO涂覆Mg2B2O5晶须增强镁基复合材料的界面相为MgCu2和MgO相,来源于CuO和基体的界面反应产物;基体析出相MgZn2在晶须两侧平行生长,在特定位置和晶须具有一定的晶体学位向关系:[001]Mg2B2O5[5143]MgZn2和(100)Mg2B2O5(0111)MgZn2;CuO涂覆Mg2B2O5晶须增强镁基复合材料的抗拉强度和伸长率分别提高了37.6%和35.7%。
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 MgCu 2 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 MgZn 2 parallel grows on the both sides of whisker and has the crystallographic orientation relationship at the special position between the MgZn 2 and Mg2B2O5 whisker, namely, [001] Mg2B2O5 [5 1 43] MgZn 2 and （100） Mg2B2O5 （0111） MgZn 2 . The ultimate tensile strength and the elongation of the CuO-coated Mg2B2O5 whisker reinforced composite have increased by 37.6% and 35.7%, respectively.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第6期1221-1225,共5页
Rare Metal Materials and Engineering
基金
国家重点基础研究发展计划(2011CB612200)
国家科技部国际科技合作计划项目(2009DFA51830)
