摘要
研究了热压纳米ＺｒＯ２粒子强韧ＭｏＳｉ２基复合材料的显微结构与力学性能，初步探讨了纳米ＺｒＯ２粒子的增韧补强机制．结果表明，复合材料的室温断裂韧性有了较大的提高，ＫＩｃ达到５．７９ＭＰａ·ｍ１／２．ＳＥＭ观察表明纳米ＺｒＯ２粒子既分布于基体材料的晶界同时也存在于晶粒内部，断口形貌呈现出沿晶与穿晶的混合型断裂特征．复合材料的韧化效应是由ＺｒＯ２粒子引起的相变韧化、晶粒桥接以及裂纹偏转等机制的综合作用．
The microstructure and mechanical properties of MoSi2-based composites reinforced by the ZrO2 particles with nanometer size reinforced are investigated, and thestrengthening-toughening mechanism of the materials is also revealed. It is shown that theroom temperature indentation fracture toughness reached 5. 79 MPa. m1/2. SEM reveals thatthe ZrO2 particles are not only distributed over the grain boundaries but are also dispersed inside grains, and the fracture takes the forms of intergranular and transgranular mixed failure. It was thought that the toughening mechanism of the composites is a synthetic effect ofthe ZrO2 phase transformation toughening, grain bridging, crack deflection and crackbranching.
出处
《甘肃工业大学学报》
1996年第1期44-48,共5页
Journal of Gansu University of Technology
基金
甘肃工业大学
西北工业大学的联合资助
关键词
复合材料
相变增韧
显微组织
硅化钼
氧化锆
composite
MoSi2
ZrO2
phase-change toughening
microstructure
mechanical property
