拉伸力學(xué)行為的影響
(1. 北京理工大學(xué) 爆炸科學(xué)與技術(shù)國家重點實驗室，北京 100081；
2. 西北有色金屬研究院，西安 710016)
摘 要: 研究TiC顆粒增強鈦基復(fù)合材料TP-650室溫拉伸狀態(tài)下的應(yīng)變率效應(yīng)。通過與基體材料對比的準(zhǔn)靜態(tài)和動態(tài)拉伸力學(xué)實驗，并利用掃描電鏡SEM觀察斷口形貌特征，分析TiC顆粒增強鈦基復(fù)合材料的拉伸力學(xué)行為。結(jié)果表明：應(yīng)變率對顆粒增強鈦基復(fù)合材料的力學(xué)行為具有較復(fù)雜的影響。在準(zhǔn)靜態(tài)下，基體和復(fù)合材料都非常接近理想彈塑性材料，且由于TiC顆粒的加入，TP-650鈦復(fù)合材料較基體表現(xiàn)出較好的增強效果；在高應(yīng)變率下，復(fù)合材料的力學(xué)性能并不優(yōu)于基體材料的，且表現(xiàn)出較高的脆性；復(fù)合材料和基體材料在不同應(yīng)變率條件下都不呈現(xiàn)單調(diào)的應(yīng)變率效應(yīng)。
關(guān)鍵字: TiC；鈦基復(fù)合材料；TP-650鈦基復(fù)合材料；應(yīng)變率效應(yīng)；拉伸斷裂
titanium matrix composite
（1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;
2. Northwest Institute for Non-ferrous Metal Research, Xi’an 710016, China）
Abstract:The strain rates effect of TiC-particle-reinforced titanium matrix composite TP-650 was investigated under room temperature tensile conditions. The quasi-static and dynamic tensile properties of the TP-650 composite were compared with those of the matrix. The morphologies of fracture surfaces of both the matrix and the composite were observed by scanning electron microscopy (SEM). The result shows that the strain rates exert complex effects on the mechanical behavior of particle-reinforced titanium matrix composite. Under the quasi-static conditions, both the behaviors of the matrix and the composite are similar to those of the ideal elastic-plastic materials. The composite has better reinforcing effect than the matrix due to the addition of the TiC particles. While under the high strain rate, the mechanical characteristics of the composite are not obviously superior to those of the matrix, and the composite shows a higher brittleness than the matrix. The composite and matrix do not show monotonic strain-rate effect under different strain rates.
Key words: TiC; titanium matrix composite; TP-650 titanium matrix composite; strain rate effect; tensile fracture
