(1. 上海交通大學(xué)金屬基復(fù)合材料國(guó)家重點(diǎn)實(shí)驗(yàn)室，上海200030;
2. 上海鋼鐵研究所鈦合金分所，上海200940)
摘 要: 利用鈦與B4C之間的自蔓延高溫合成反應(yīng)經(jīng)普通的熔鑄工藝原位合成制備了TiC和TiB增強(qiáng)的鈦基復(fù)合材料。光學(xué)金相、EPMA、TEM和X射線衍射的研究結(jié)果表明：存在兩種不同形狀的增強(qiáng)體，即短纖維狀TiB晶須和等軸、近似等軸狀TiC粒子。TiB 與Ti基體界面潔凈，沒(méi)有明顯的界面反應(yīng)，而TiC與Ti基體界面有非化學(xué)配比的TiC過(guò)渡層存在。由于增強(qiáng)體承受載荷，基體合金晶粒細(xì)化以及高密度位錯(cuò)的存在，制備鈦基復(fù)合材料的室溫和高溫性能有了較大的提高。
關(guān)鍵字: 原位合成；鈦基復(fù)合材料；TiC；TiB；力學(xué)性能
（1. State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200030, P.R.China;
2. Shanghai Iron and Steel Research Institute Titanium Alloys Branch, Shanghai 200940, P.R.China）
Abstract:TiB and TiC reinforced Ti matrix composites have been produced in situ by common casting and hot-forging technology. The results of optical microscopy, EPMA, TEM and XRD show that there are two reinforcements with different shapes, namely, short-fibre TiB and equiaxed or near-equiaxed TiC particles. TiB whiskers were made to align along the hot-forging direction after hot-forging. The interface between reinforcements and Ti matrix alloy is clean. There isn't interface reaction between TiB and Ti matrix alloy, while there is non-stoichiometric annuli in interface between TiC and Ti matrix alloy. The mechanical properties at room and elevated temperature of Ti matrix composites have been improved at large scale due to the following reasons: TiB whiskers and TiC particles undertaking load, refining of titanium matrix alloy'grains and high density dislocation in Ti matrix alloy.
Key words: TiB; TiC Ti matrix composites; in situ synthesis; mechanical properties
