颗粒含量对准晶增强Al-Mg基复合材料组织和性能的影响  

Influence of Particle Content on the Microstructures and Properties of Al-11Mg-Based Composites Reinforced by Quasicrystal Particles

作　　者：王兵辉[1] 杨根仓[1] 朱满[1] 程素玲[1] 周尧和[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《稀有金属材料与工程》2008年第11期1961-1965,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(50571081);航空科学基金项目(04G53042)资助

摘　　要：以Al-11%Mg(质量分数,下同)合金为基体,十面体准晶相Al72Ni12Co16为增强颗粒,通过机械搅拌法制备了Al-Ni-Co准晶颗粒增强Al-Mg基复合材料。分别采用扫描电镜(SEM)和能谱分析(EDS)研究了颗粒含量对复合材料的组织形貌及成分的影响,并总结了复合材料的抗拉强度和布氏硬度随颗粒含量的变化规律。结果表明,随着颗粒含量的增加,由准晶相转化成的θ相的形貌发生如下转变:细长针状→短板条状→多边形状,而不同形貌的成分则基本保持一致;复合材料的抗拉强度σb和布氏硬度HBS随颗粒加入量的增加而增加。并简要分析了Al-Ni-Co准晶颗粒增强Al-Mg基复合材料的强化机理。Al-11MG based composites reinforced by Al-Ni-Co quasi-crystal particles were fabricated by fusion mechanical stirring method using Al-11Mg and Al72Ni12Co16 decagonal quasi-crystal as basal alloy and reinforced particle respectively. The influence of reinforce particle fraction on microstructures, mechanical properties and chemical composition of Al72Ni12Co16/Al-11Mg composites were investigated by SEM, energy dispersive spectrum （EDS） analysis and mechanical test. The results showed that with the increase of reinforce particle fraction, the changed order for the morphologies of θ phase transformed by Al72Ni12Co16 decagonal quasi-crystal is as follow： needle-shaped→ short lathy→polygon. The chemical compositions of the particles with different shape are similar. The tensile strength σb and Brinell hardness HBS of the composites increase with the increase of the Particle fraction. The strengthen mechanism of Al-Mg based composites reinforced by Al-Ni-Co decagonal quasi-crystal particles was also discussed.

关 键 词：Al72Ni12Co16准晶相 组织形貌及成分 抗拉强度 布氏硬度 强化机理 

分 类 号：TB33[一般工业技术—材料科学与工程]