Metal matrix composites (MMCs) reinforced by micro- or submicro-sized ceramic particles without chemical reactions along the particles/matrix interfaces can be produced efficiently using high-intensity ultrasonic vibrations. MMCs thus obtained possesse good mechanical properties. The relation between volume fraction and size of the reinforced particles and the MMCs' properties (E, σb, Hv and δ) and the relation between apparent viscosity of the melt and reinforcement sizes were obtained. By SEM in-situ observation of fracture process during tensile testing and the analysis of the internal stress field in the composite, it was found that the increase of ultimate strength results from a combined effect of strain and stress hardening of the matrix. By combining exothermic dispersion method with ultrasonic dispersion techniques, the composites reinforced by nano-sized ceramic particles could be produced, which possess both high strength and good ductility.
将超声波引入座滴法界面张力测量系统,实时、定量测量金属熔体-陶瓷增强相界面润湿性随超声能量与作用时间的变化规律。系统、深入地研究超声参量对界面的微观结构、成分和性能的影响。上述研究可从本质上揭示超声改善金属熔体-陶瓷润湿性的机制,填补有关理论空白,并为高性能金属基复合材料的制备提供重要的理论与实验依据。
{{i.achievement_title}}
数据更新时间:2023-05-31
超声无线输能通道的PSPICE等效电路研究
组蛋白去乙酰化酶在变应性鼻炎鼻黏膜上皮中的表达研究
早孕期颈项透明层增厚胎儿染色体异常的临床研究
SUMO特异性蛋白酶3通过调控巨噬细胞极化促进磷酸钙诱导的小鼠腹主动脉瘤形成
重金属-柠檬酸-针铁矿三元体系的表面络合模型研究
金属陶瓷中金属镍对陶瓷相润湿性的研究
“共晶液相”辅助下熔体自生复合陶瓷高速超塑变形机制研究
镁熔体与陶瓷的润湿性及蒸发和晶体取向的影响
超声场作用下金属熔体中异相粒子运动行为及控制