搅拌制备B_4C(SiC_p)/A356复合材料的组织与性能  

Microstructure and Mechanical Properties of A356-B_4C/SiC_p Composites Fabricated by Compocasting Method

作　　者：胡启耀[1] 赵海东[1] 葛继龙[1] 

机构地区：[1]华南理工大学国家金属材料近净成形工程技术研究中心

出　　处：《特种铸造及有色合金》2015年第11期1213-1216,共4页Special Casting & Nonferrous Alloys

基　　金：国家高技术研究发展计划(863计划)资助项目(2013AA031201);广东省部产学研项目(2013B090600118)

摘　　要：采用改进的半固态搅拌铸造法分别制备了B4C/A356和SiCp/A356复合材料,对两种不同制备工艺下复合材料的组织及性能进行了对比研究。结果表明,SiCp颗粒可在较低的固相率下(约26%)成功加入并实现均匀分布,而B4C颗粒需选择更大的固相率(约27%);B4C颗粒与基体反应产生了大量反应产物,而SiCp颗粒与基体几乎不反应。往熔体中添加1.2%的Ti,可使前者反应产物显著减少;SiCp与基体形成了强度较高的结合面,使得SiCp/A356复合材料具有更好的拉伸性能。B4C/A356 and SiCp/A356 composites were prepared by compocasting method,and microstructure and mechanical properties of two composites prepared were investigated by SEM,OM and hardness testing,tensile testing.The results indicate that SiCp/A356 composites with uniformly distributed reinforcements SiCpcan be fabricated successfully at a lower solid fraction（about 26%）,while at a higher value（about 27%）of solid fraction,B4C/A356 composites can be prepared.Additionally,B4 C particles can react with molten Al during the preparation and lots of reaction products can be observed,however,reaction of SiCp with molten aluminum alloy is absent,and the levels of reaction products can be controlled by adding 1.2% Ti.Further more,SiCp/A356 composites have a better tensile properties due to generate a strong bonding interface.

关 键 词：颗粒增强铝基复合材料 半固态搅拌铸造法 固相率 颗粒分布 界面反应 

分 类 号：TB33[一般工业技术—材料科学与工程]