A nanostructural design to produce high ductility of high volume fraction SiCp/Al composites with enhanced strength

作者：Wu Gaohui^*; Wang Xi; Jiang Longtao; Ma Boran

来源：Materials & Design, 2014, 61: 141-145.

DOI：10.1016/j.matdes.2014.04.048

• Liquid infiltration
• Particulate reinforced composites
• Al-Sc-Zr alloy
• Nanostructured materials
• Ductility

High ductility and increased strength of SiCp/Al composites are highly desirable for their applications in complicated components. However, high ductility and high strength are mutually exclusive in high volume fraction SiCp/Al composites. Here, we report a novel nanostructuring strategy that achieves SiCp/Al-Sc-Zr composites with superior maximum tensile strain and enhanced tensile strength. The new strategy is based on combination of grain refinement down to ultra-fine scale with nanometric particles inside the grain through adding distinctive elements (Sc, Zr) and refining nucleation centers to nanoscale under the action of high volume fraction reinforcement during the fabrication process. The nanostructured SiCp/Al-Sc-Zr composites had an increase of similar to 300% in maximum tensile strain and a 21% increase in tensile strength. This thought provides a new sight into enhancement of both strength and ductility of particle reinforcement metal matrix composites.

• 出版日期2014-9
• 单位哈尔滨工业大学