粉末粒度对FSP制备Al-Ni金属间化合物增强铝基复合材料的影响

Influence of Powder Size on the Al-Ni Intermetallic Compound Reinforced Aluminum Matrix Composites Fabricated by FSP

摘要:

采用搅拌摩擦加工法在Al基体中添加粒度30~40 μm，8~10 μm，2~3 μm的Ni粉，制备Ni(400)/Al、Ni(1500)/Al及Ni(6500)/Al复合材料。采用SEM、EDS 以及XRD 对复合区微观结构及相组成进行分析。结果表明，Ni粉粉末粒度对生成的产物形态有较大影响，随着粉末尺寸增大，团聚效应减弱，破碎效果增强，Ni(6500) /Al、 Ni(1500) /Al 和Ni(400) /Al中Ni团体依次呈独特叠层状组织、类椭圆形结构和近圆形结构；粉末尺寸的增大对金属间化合物的生成更有利；与基体相比，Ni(6500) /Al、 Ni(1500) /Al 和Ni(400) /Al的抗拉强度依次提高了50%、59%和71.9%。

Abstract:

Ni(400)/Al, Ni(1500)/Al and Ni(6500)/Al composite materials were fabricated by adding 30~40 μm, 8~10 μm and 2~3 μm Ni powder to the Al substrate in the friction stir processing (FSP) period. The microstructures of the surface composites were analyzed by SEM and EDS, while the phase composition was examined by XRD. Results show that Ni powder particle size has a great influence on morphological characteristics of their products. As the powder size increases, the aggregation effect becomes weaker while the crushing effect is enhanced. And Ni aggregation in Ni(6500)/Al, Ni(1500)/Al and Ni(400)/Al present an unique laminated structure, a nearly elliptic structure and a nearly circular structure, respectively. The increase of powder size is more conducive to the intermetallic compound reaction. Moreover, compared with the matrix, the tensile strength of Ni (6500)/Al, Ni(1500)/Al and Ni(400)/Al is increased greatly by 50%, 59% and 71.9%, respectively.