Al matrix composites reinforced with β-Si₃N₄ whiskers (β-Si₃N₄w) were fabricated by hot pressing method. The microstructures showed that the whiskers were uniformly dispersed in the matrix and the Al/β-Si₃N₄ interface was well bonded without interface reaction. Effects of β-Si₃N₄w content and sintering parameters on the densification and tensile behavior of composites were investigated. The results indicated that β-Si₃N₄w could both enhance the ultimate tensile strength (UTS) and maintain the ductility of Al matrix when the whisker content was 5 vol%, corresponding to an elongation at break and an UTS of 21.2% and 239 MPa, respectively. However, higher whisker content could improve UTS of composites to the maximum value of 312 MPa, which was 158 MPa higher than pure Al, while reducing elongation of composites. The fracture mechanism changed from ductile fracture to a combination of both ductile and brittle fracture mechanism with the increase of whisker content.

铝基复合材料具有β型Si增强_3个Ñ ₄晶须（β型Si ₃ Ñ ₄ W）通过热压法制造的。微结构表明，晶须均匀地分散在基体和Al /β型Si ₃ Ñ ₄接口而不界面反应良好粘合。的β型Si效果₃ Ñ ₄考察了复合材料的致密化和拉伸行为瓦特含量和烧结参数。结果表明，β型Si ₃ Ñ ₄当晶须含量为5 vol％时，w既可以提高极限抗拉强度（UTS），又可以保持Al基体的延展性，分别对应于断裂伸长率和UTS分别为21.2％和239 MPa。但是，较高的晶须含量可以使复合材料的UTS最高达到312 MPa，比纯Al高158 MPa，同时降低复合材料的伸长率。随着晶须含量的增加，断裂机理从韧性断裂转变为韧性断裂和脆性断裂的组合。