颗粒增强铝基复合材料的组织与性能

来源期刊：中国有色金属学报1998年第2期

论文作者：凌兴珠 徐振民

文章页码：286 - 290

关键词：颗粒增强 铝基复合材料 TiB₂

Key words：particle reinforcement , aluminium matrix composites , TiB₂

摘    要：用熔铸法制备了TiB₂和SiC颗粒增强铝基复合材料，评价了TiB₂/Al和SiC/Al复合材料的硬度，研究了增强剂的加入方式和体积分数对TiB₂/Al复合材料拉伸性能的影响； 并用扫描电镜分析了复合材料的显微组织。结果表明，TiB₂颗粒对Al基体的增强效果比SiC颗粒好，Ti，B化合物的增强效果优于TiB₂粉末，复合材料的力学性能随TiB₂体积分数增加而提高；用含Ti，B化合物的混合物增强的1.5%TiB₂/Al(体积分数)复合材料的热轧退火态性能为σ_b160.4 MPa，δ13.1%，铸态HB 451MPa。SEM观察结果表明，在铝基体中添加Ti、B化合物的混合物能在基体中原位生成TiB₂颗粒。

Abstract: TiB₂ and SiC particle reinforced aluminium matrix composites were prepared by casting. The hardness of TiB_2p/Al and SiC_p/Al composites were evaluated. The effects of addition method and volume fraction of reinforcement on tensile property of TiB_2p/Al composites were studied. The microstructrues of the composites were analyzed by SEM. The results indicate that hardening efficiency of TiB₂ particle is better than that of SiC particle, the reienforcement efficiency of Ti or B compound is superior to TiB₂ powder; the mechanical properties of composites increase with increasing volume fraction of TiB₂. The properties of 1.5% TiB₂/Al(volume fraction) reinforced using a mixture of Ti and B compound are σ_b=160.4 MPa, δ=13.1% as hot rolled and annealed and HB=451 MPa as cast, respectively. SEM observation show that the TiB₂ particle in-situ formed in an aluminium matrix when a mixture of Ti and B compound were added to matrix.