原位自生TiB_2/7055复合材料的组织与力学性能  

Microstructure and Mechanical Properties of In-situ Sub-micron TiB_2/7055 Matrix Composites

作　　者：张建平[1] 乐永康[1] 毛建伟[1] 

机构地区：[1]苏州有色金属研究院有限公司

出　　处：《特种铸造及有色合金》2009年第3期249-251,共3页Special Casting & Nonferrous Alloys

基　　金：中国铝业公司科技发展基金资助项目(ZB2006CBQB13-B18)

摘　　要：对原位自生亚微米TiB2/7055铝基复合材料的微观组织与力学性能进行了研究。结果表明,采用混合盐法反应工艺制备的TiB2含量为12%的7055复合材料,颗粒形状大小均匀,尺寸在200～500nm之间,适量加入活性元素Mg,可以改善TiB2颗粒与铝基体界面润湿性,有效抑制颗粒的团聚,抗拉强度达到718MPa,屈服强度达到679MPa,伸长率达到4.2%,弹性模量达到86GPa,复合材料拉伸断口呈韧性断裂特征,TiB2与基体界面的破坏以脱粘机制为主。Microstructure and mechanical properties of in-situ sub-micron TiB2/7055 matrix composites have been investigated by OM(optical microscope),SEM(scanning electron microscope)and XRD(X-ray diffraction).The results indicate that uniform particle with 200～500 nm in size can be generated in 7055 aluminum matrix composites with 12% TiB2 content in volumetric fraction prepared by salt-mixture method.Appropriate Mg addition can greatly restrict the agglomeration of the TiB2 particles as a result of improving interface wettability between TiB2 particles and aluminum matrix,which can be responsible for the composites with the tensile strength of 718MPa,yield strength of 679MPa and elongation of 4.2% as well as elastic modulus of 86GPa.Fracture morphology of the composites is characterized by ductile mode,and failure of TiB2 particle with matrix interface is controlled by debonding mechanism.

关 键 词：铝基复合材料 TIB2 原位自生 微观组织 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程] TG113[金属学及工艺—物理冶金]