(中南工業(yè)大學(xué)粉末冶金研究所，長(zhǎng)沙 410083)
摘 要: 用熔鑄法制備了TiB2和SiC顆粒增強(qiáng)鋁基復(fù)合材料，評(píng)價(jià)了TiB2/Al和SiC/Al復(fù)合材料的硬度，研究了增強(qiáng)劑的加入方式和體積分?jǐn)?shù)對(duì)TiB2/Al復(fù)合材料拉伸性能的影響； 并用掃描電鏡分析了復(fù)合材料的顯微組織。結(jié)果表明，TiB2顆粒對(duì)Al基體的增強(qiáng)效果比SiC顆粒好，Ti，B化合物的增強(qiáng)效果優(yōu)于TiB2粉末，復(fù)合材料的力學(xué)性能隨TiB2體積分?jǐn)?shù)增加而提高；用含Ti，B化合物的混合物增強(qiáng)的1.5%TiB2/Al(體積分?jǐn)?shù))復(fù)合材料的熱軋退火態(tài)性能為σb160.4 MPa，δ13.1%，鑄態(tài)HB 451MPa。SEM觀察結(jié)果表明，在鋁基體中添加Ti、B化合物的混合物能在基體中原位生成TiB2顆粒。
關(guān)鍵字: 顆粒增強(qiáng) 鋁基復(fù)合材料 TiB2
（Powder Metallurgy Research Institute, Central South University of Technology, Changsha 410083, P. R. China）
Abstract:TiB2 and SiC particle reinforced aluminium matrix composites were prepared by casting. The hardness of TiB2p/Al and SiCp/Al composites were evaluated. The effects of addition method and volume fraction of reinforcement on tensile property of TiB2p/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 σb=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.
Key words: particle reinforcement aluminium matrix composites TiB2
