(湖南大學(xué)機(jī)械與汽車(chē)工程學(xué)院， 長(zhǎng)沙 410082)
摘 要: 采用XD法與攪拌鑄造技術(shù)相結(jié)合的工藝制備了TiCp/ZA43復(fù)合材料，其中TiC粒子的尺寸為0.5～1.5 μm，在基體中分布均勻。對(duì)TiCp/ZA43復(fù)合材料室溫至250 ℃溫度范圍的力學(xué)性能進(jìn)行了測(cè)試， 獲得了該復(fù)合材料的應(yīng)力-應(yīng)變曲線(xiàn)及力學(xué)性能與溫度的關(guān)系， 并對(duì)其高溫拉伸斷口進(jìn)行了分析。結(jié)果表明： TiC粒子提高了材料的強(qiáng)度，尤其是顯著提高了高溫強(qiáng)度；TiCp/ZA43復(fù)合材料的斷裂方式與拉伸溫度有關(guān)， 在250 ℃時(shí)呈現(xiàn)塑性斷裂。
關(guān)鍵字: 復(fù)合材料 TiCp/ZA43 高溫力學(xué)性能 斷裂
（School of Mechanical and Automobile Engineering,Hunan University, Changsha 410082, P. R. China）
Abstract:TiCp/ZA43 composites was successfully prepared by combining advantages of XD and stirring-casting techniques. The microstructures of TiCp/ZA 43 composites exhibited a uniform dispersion of TiC particles with size of 0.5～1 .5 μm in matrix. The tensile properties of TiCp/ZA43 composites at ambient and elevated(to 250 ℃) temperatures were studied. The stress-strain plots varies with temperature and the relationship between the mechanical properties of the composites and temperature were obtained. The results showed that TiC particles remarkably improve the strength of the composites at room and elevated temperatures, and the fracture modes of the composites are dependent on temperature, at about 250 ℃, the composite has high plasticity.
Key words: composites TiCp/ZA43 mechanical property at elevated temperature fracture
