Ti,B 化合物制取颗粒增强 TiB₂/Al 复合材料

来源期刊：中南大学学报(自然科学版)1997年第6期

论文作者：凌兴珠 徐振民

文章页码：57 - 60

关键词：铝基复合材料; 颗粒增强; TiB₂

Key words：aluminum matrix composite; particulate reinforcement; TiB₂

摘    要：用熔炼法制备TiB₂/Al复合材 料.通过添加Ti,B化合物,在纯铝基体中原位生成TiB₂颗粒,基体得以增强.就TiB₂的体积分数对复合材料机械性能和显微组织的影响进行了研究,并 对两种Ti,B化合物(Ⅰ,Ⅱ号)的增强效果进行了比较.结果表明,TiB₂/Al复合材料的机械性能明显优于铝基体.与Ⅰ号Ti,B化合物相比,Ⅱ号 Ti,B化合物能更有效地提高复合材料的强度和硬度.TiB₂/Al复合材料的拉伸强度和硬度随Ti,B化合物加入量增多而提高,而延伸率降低.含 2.0%(体积分数)TiB₂的复合材料其热轧退火态的拉伸强度和铸态布氏硬度分别为158MPa和388MPa,与纯铝基体相比,拉伸强度和硬度分别提高了111%和51%.

Abstract: TiB₂/Al composites were fabricated by casting in the present work.When Ti,B compounds were added to pure aluminum,aluminum matrix were reinforced due to the formation in-situ of Ti B₂ particles in the aluminum matrix.Effects of volume fraction of Ti B₂ on mechanical properties and microstructure of composites were studied,and the reinforced efficiency of two Ti,B compounds (Ⅰ and Ⅱ)were compared.The results indicated that the mechanical properties of TiB₂/Al composites were superior to aluminum matrix.Ti,B compound Ⅱ reinforcement was more effective than Ti,B compound Ⅰ in increasing the strength and hardness of the composite.Tensile strength and hardness of TiB₂/Al composites increased with increasing amounts of Ti,B compound,but elongation decreased.In the case of 2 0%(volume fraction) TiB₂/Al composite,tensile strength as-hot rolling and annealed and Brinell hardness as-cast were 158 MPa and 388 MPa respectively.As compared with pure aluminum matrix,the tensile strength and hardness increased by 111% and 51% respectively.