Ti元素改性SiC_p/2024铝基复合材料的制备及其力学性能表征  

Preparation and Mechanical Characterization of Ti Modified SiC Particle Reinforced 2024 Aluminum Alloy Composite

作　　者：杨锐[1,2] 王筱峻[1,2] 陈名海[2] 刘宁[1] 李清文[2] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]中国科学院苏州纳米技术与纳米仿生研究所,江苏苏州215123

出　　处：《铸造》2014年第2期156-161,共6页Foundry

基　　金：苏州市科技项目纳米专项(ZXG2012007)

摘　　要：采用搅拌铸造技术制备Ti元素改性SiC p/2024铝基复合材料,并对铸态材料进行二次加工,研究Ti改性、热挤压以及颗粒含量对复合材料力学性能的影响,通过X射线衍射(XRD)和扫描电子显微镜(SEM)等测试分析手段对物相结构进行表征。结果表明,增加Ti元素含量可以提高2024基体及其复合材料力学性能;热挤压有利于改善SiC颗粒与基体的界面结合,使材料性能较铸态显著提高,并且在细化材料组织的同时还能使Ti元素的作用得到进一步加强;复合材料的综合力学性能在颗粒含量3%时达到最佳,其中热挤态拉伸强度和硬度分别可达311 MPa和HB133,较铸态2024基体分别提高了94.4%和84.7%。Ti modified SiC particle reinforced 2024 aluminum alloy composite was fabricated by stir casting, the as-cast composite was then secondary processed, the effect of Ti modification, hot extrusion and particle content on the mechanical properties of composite were investigated. The composites were characterized by X-ray diffraction （XRD） and scanning electron microscope （SEM）. The results show that the mechanical property of matrix and composite is enhanced by increasing Ti content; the SiCr/A1 interface bonding is strengthened by hot extrusion, so the performance of as-extruded materials is much higher than as-cast, in addition, the process can refine the material organization and strengthen the effect of Ti at the same time; the comprehensive mechanical property of composites attains the best under the condition of 3 wt.% particle content. The as-extruded tensile strength and Brinell hardness reaches 311 MPa and HB 133 respectively, which improves by 94.4% and 84.7% compared with as-cast 2024 alloy matrix.

关 键 词：SICP 2024铝基复合材料 Ti元素改性 搅拌铸造 热挤压 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程]