2-Ti2AlN/TiAl復(fù)合材料，并對(duì)TiAl復(fù)合材料的顯微組織演變和室溫力學(xué)性能進(jìn)行了研究。結(jié)果表明，添加低含量BN納米片的TiAl復(fù)合材料為全片層組織，而添加高含量BN納米片的TiAl復(fù)合材料向近片層組織轉(zhuǎn)變。此外，原位合成的TiB2-Ti2AlN顆粒均勻分布在片層團(tuán)晶界處，顯著細(xì)化了復(fù)合材料組織。當(dāng)添加質(zhì)量分?jǐn)?shù)為0.5%的BN納米片時(shí)，TiB2-Ti2AlN顆粒在片層團(tuán)晶界處形成連續(xù)核殼結(jié)構(gòu)。室溫壓縮和摩擦磨損結(jié)果表明，隨著B(niǎo)N納米片質(zhì)量分?jǐn)?shù)從0%增加到1%，TiAl復(fù)合材料的顯微硬度和抗壓縮強(qiáng)度顯著提高，摩擦磨損系數(shù)從0.59降低到0.47，磨損率降低了29.9%。TiAl復(fù)合材料優(yōu)異的力學(xué)性能主要?dú)w因于原位析出的TiB2-Ti2AlN顆粒、細(xì)化的顯微組織和核殼結(jié)構(gòu)所產(chǎn)生的強(qiáng)化效應(yīng)。;TiAl alloy was mixed with BN nanoplates and then sintered at 1300 °C through spark plasma sintering technique, and the hybrid TiB2-Ti2AlN/TiAl composites were in-situ prepared. The microstructural evolution and mechanical properties at room temperature of TiAl composites were investigated. Results show that a fully lamellar microstructure can be achieved in the TiAl composites with BN nanoplates of lower content, whereas a transformation to the nearly lamellar microstructure can be observed under higher BN nanoplate content conditions. The microstructure of TiAl composites is significantly refined due to the even distribution of in-situ prepared TiB2-Ti2AlN particles at the lamellar colony boundaries. Notably, a continuous core-shell structure of TiB2-Ti2AlN particles is formed at the lamellar grain boundary after adding 0.5wt% BN nanoplates. The results of compression and friction wear at room temperature show that the hardness and compressive strength of TiAl composites are greatly improved with the increase in BN nanoplate content from 0wt% to 1wt%. Meanwhile, the average coefficient of friction decreases from 0.59 to 0.47, and the wear rate decreases by 29.9%. These remarkable mechanical properties are mainly attributed to the strengthening effects of the in-situ formation of TiB2-Ti2AlN particles, refined microstructure, and core-shell structure."/>
2-Ti2AlN顆粒;放電等離子燒結(jié);力學(xué)性能;TiAl composite;TiB2-Ti2AlN particle;SPS;mechanical properties"/>