Al-7Si-0.3Mg铝基复合材料力学性能及显微结构的研究.pdfVIP

学兔兔 Oct．2015 · 980· Vo1．64 NO．1O P ● {复合材料{ SiOdAI一7Si一0．3Mg~B基复合材料力学性能及 显微结构的研究 黄世源1． ，唐 鑫l_ ，莫龙华 ， f1．桂林理工大学有色金属及材料加工新技术教育部重点实验室，广西桂林541004； 2．桂林理工大学材料科学与工程学院，广西桂林541004) 摘要：采用超声处理制备了二氧化硅纳米颗粒增强A1—7si一0．3Mg纳米复合材料，并将制备的试样进行了力学性能测 试及显微结构分析。试验结果表明，添加1％的纳米二氧化硅，使得合金中的共晶硅得到明显的细化，显著提高了铸 态A1—7Si．0．3Mg合金的力学性能。在T6热处理后其屈服强度、抗拉强度得到进一步提高，但其延展性却没有实现大 幅度的提升。 关键词：铝基复合材料；二氧化硅；纳米颗粒增强；超声处理 中图分类号：TG331 文献标识码：A 文章编号：1001—4977(2015)10—0980—06 Study of Mechanical Properties and Microstructure of SiOdAI一7Si一0．3Mg Aluminum Matrix Composite HUANG Shi-yuan ，TANG Xinu，MO Long-hua 。 (1．KeyLaboratoryofNewProcessingTechnologyforNonferrousMetalMaterials,MinistryofEducation,Guilin541004,Guangxi， China；2．College ofMaterial Science and Engineering，Guilin University ofTechnology，Guilin 541004，Guangxi，China) Abstract：Silicondioxidenanoparticlesreinforcedaluminummatrixnanocompositewasfabricatedbyultrason— iC processing．The mechanical properties and microstructures of the prepared samples were analyzed． Experimental results show that the mechanical properties ofthe as．cast A1．7Si．0．3Mg alloy were increased with the addition Of l wt％SiO，nanoparticales．The main reason could be attributed to the modification ofeutectic Si and grain refinement．The nanocomposites were further enhanced in yield and tensile strength after T6 heat treatment．but ductility did not improved greatly． Key words：aluminum matrix composites；silicon dioxide；nanoparticle reinforced；ult