石墨烯增强AZ91镁基复合材料的力学性能

２０１６年８月第４０卷第８期 Vol．４０No．８Au g ．２０１６

DOI :１０．１１９７３/j x g ccl２０１６０８０１１

收稿日期:２０１５-０７-１５;修订日期:２０１６-０６-２８基金项目:江西省教育厅科技项目(GJJ１５１３０９)作者简介:袁秋红(１９８１－),男,江西吉安人,博士研究生.导师:曾效舒教授石墨烯增强AZ９１镁基复合材料的力学性能

袁秋红１,２,曾效舒１,吴俊斌１

(１．南昌大学机电工程学院,南昌３３００３１;２．

新余学院新能源科学与工程学院,新余３３８０００)摘 要:分别以质量分数为０．１％的氧化石墨烯和石墨烯纳米片为增强相制备了AZ９１镁基复合

粉和复合材料,分析了氧化石墨烯与AZ９１镁合金的界面反应机理;测试了复合材料的力学性能并观察了拉伸断口形貌.结果表明:以氧化石墨烯为增强相复合材料的屈服强度二伸长率和显微硬度分别为２２４．８５MPa ,８．１５％和７０．１４HV ,与基体镁合金的相比分别提高了３９．７％,３５．４％和３１．８％,

高于以石墨烯纳米片为增强相复合材料的;氧化石墨烯因带有含氧官能团极易与镁合金粉混合均匀,且两者反应生成的M g O 有利于提高石墨烯与镁合金基体的界面结合强度,从而提高复合材料的力学性能.

关键词:AZ９１镁合金;

氧化石墨烯;复合材料;力学性能中图分类号:TG１４６．２;TB３３３ 文献标志码:A 文章编号:１０００-３７３８(２０１６)０８-００４３-０６Mechanical Pro p erties of Gra p hene Reinforced AZ９１M g Allo y Based Com p osite

YUAN Q iu-hon g １,２,ZENG Xiao-shu １,WU Jun-bin １

(１．Mechanical &Electronic Colle g e ,Nanchan g Universit y ,Nanchan g ３３００３１,China ;２．Colle g e of New Ener gy Science and En g ineerin g ,Xin y u Universit y ,Xin y u ３３８０００,China )Abstract :The AZ９１M g allo y based com p osite p owder and materials were p re p ared with g ra p hene oxide and g ra p hene nanosheet as stren g thenin g p hase res p ectivel y and the interface reaction mechanism of g ra p hene oxide with AZ９１M g allo y was anal y zed．The mechanical p ro p erties of the com p osites were tested and the tensile fracture surfaces were observed．The results show that the y ield stren g th ,elon g ation and microhardness of the com p osite with g ra p hene oxide as stren g thenin g p hase reached ２２４．８５MPa ,８．１５％and ７０．１４HV ,which were im p roved b y ３９．７％,３５．４％and ３１．８％res p ectivel y com p arin g to those of AZ９１M g allo y and also much hi g her than those of the com p osite with g ra p hene nanosheet as stren g thenin g p hase．The g ra p hene oxide was eas y to dis p erse uniforml y with the AZ９１M g allo y p owder due to its ox yg en g rou p s ;the interface bondin g between g ra p hene and M g allo y matrix can be stren g thened b y M g O p roduced b y the reaction between the M g allo y and the ox yg en g rou p s ,resultin g in the

im p rovement of mechanical p ro p erties of the com p osite．Ke y words :AZ９１M g allo y ;g ra p hene oxide ;com p osite ;mechanical p ro p ert y

０ 引 言

石墨烯是由SP ２杂化碳原子构成的单原子层厚度的二维材料,具有优异的电学二热学和力学性能,室温下其电子/空穴迁移速率达１．５?１０４cm ２.V －１.s －１,热导率达５?１０４W .m －１.K －１,其抗拉强度和弹性模量分别可达１２５GPa 和１１００GPa [

１－３].自Novselov 等[４]利用胶带剥离法制备出石墨烯以

来,其特殊的二维结构及优异的物理化学性能引起了研究人员的极大兴趣,将其添加到聚合物二陶瓷二金属等材料中以提高材料的性能已成为目前研究的热点之一.然而,目前有关石墨烯增强金属基复合

材料的报道非常少,尤其是石墨烯增强镁基复合材

料的研究,还处于起步阶段.

相关研究表明[５－１１],要制备高性能石墨烯/镁基复合材料,一方面要改善石墨烯的制备工艺,以

制备出高性能单层/少层石墨烯并提高其产出率;

另一方面,与碳纳米管增强金属基复合材料类似,

石墨烯同样面临着在基体中分散不均匀和与基体

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