碳纤维/镁复合材料的显微组织与弯曲性能  

Microstructures and Bending Properties of C_(f)/Mg Composites

作　　者：李雪健 周海涛 孙振明 蒋博 施海龙 胡小石[1] 王晓军[1] LI Xuejian;ZHOU Haitao;SUN Zhenming;JIANG Bo;SHI Hailong;HU Xiaoshi;WANG Xiaojun(School of Material Science and Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China;Shanghai Spaceflight Precision Machinery Institute,Shanghai 201600,China)

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001 [2]上海航天精密机械研究所,上海201600

出　　处：《上海航天（中英文）》2024年第5期171-177,共7页Aerospace Shanghai（Chinese&English）

基　　金：国家自然科学基金青年基金(52301142);上海航天科技创新基金(SAST2019-125)。

摘　　要：为满足极端空天环境对轻质结构材料提出的要求,采用压力渗透法制备了T300、T700和M40碳纤维增强镁基复合材料(C_(f)/Mg)。研究了不同种类碳纤维对C_(f)/Mg复合材料界面显微组织和弯曲性能的影响。结果表明:T300/AZ91D和T700/AZ91D复合材料中均存在严重的界面反应产物Al_(4)C_(3)相,使复合材料在低应力下发生脆性断裂。然而,在M40/AZ91D复合材料中,界面处Al_(4)C_(3)相的量显著减少和尺寸显著减小,界面强度相对较高。因此,M40/AZ91D复合材料能够充分发挥出载荷传递效果,最终表现出1100 MPa的较高弯曲强度。In order to meet the requirements of lightweight structural materials in extreme space environment,the T300,T700,and M40 carbon fiber-reinforced magnesium matrix composites(C_(f)/Mg)are fabricated by the pressure infiltration method.The effects of carbon fiber on the interfacial microstructures and mechanical properties of the C_(f)/Mg composites are investigated.The results show that there is a serious interfacial reaction product Al_(4)C_(3)in both the T300/AZ91D and T700/AZ91D composites,which makes the composites brittle fracture under the low stress.However,the amount and size of Al_(4)C_(3)are reduced significantly at the interfaces in the M40/AZ91D composites,which implies a moderate interfacial bonding strength.Therefore,the M40/AZ91D composite can fully exert its load transfer effect,and ultimately exhibits a high bending strength of 1100 MPa.

关 键 词：碳纤维 镁基复合材料 显微组织 界面 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]