AlTi_5B_1对亚共晶铝硅合金的组织和性能的影响  

Effects of AlTi_5B_1 on Structure and Properties of Hypoeutectic Al-Si Alloy

作　　者：舒华记[1] 司乃潮[1] 孙少纯[1] 刘光磊[1] 吴勤方 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]苏州明志科技有限公司,江苏苏州215217

出　　处：《铸造》2011年第11期1122-1125,共4页Foundry

基　　金：科技部科技型中小企业技术创新基金资助项目(09C26279200863)

摘　　要：研究了AlTi5B1的加入量对亚共晶铝硅合金微观组织和力学性能的影响。结果表明:AlTi5B1的加入量对合金的抗拉强度影响较大,并在Ti含量为0.06%时,抗拉强度达到最大值;对伸长率的影响和对抗拉强度的影响是一致的;对合金的硬度影响较小。加入AlTi5B1细化处理后,TiB2粒子和三元相Ti(A11-x,Six)3数量增加,是α-Al相的有效形核核心,起主要的细化作用;第二相(Fe相,AlCu相)的形貌及分布发生了变化,强化了晶界,减弱了Fe相的有害作用。The influence of AITi5B1 content on microstructure and mechanical properties of hypoeutectic AI-Si alloy was studied. The results show that the AITi5B1 content exerts a greater influence on the tensile strength of alloy and when Ti reaches 0.06wt.%, the tensile strength reaches its maximum. The influence of AITi5B1 content on elongation is similar to tensile strength. AITisB1 content has a smaller effect on the hardness of alloy. After inoculation with AITi5B1, the quantity of TiB2 and Ti（ A1 1-x, Six）3 as effective nucleation cores increases, which play a major role in the refinement. The morphologies and distributions of second-phase （Fe phase, AICu phase） change, which intensifies grain boundary and weakens Fe phase＇s negative action.

关 键 词：铝硅合金 AlTi5B1 抗拉强度 伸长率 硬度 显微组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]