Al-Si-Ni composite with a low-temperature coefficient of linear expansion
The melt spinning and ball-milling techniques were applied to fabricate powder Al-Si-Ni alloy. The obtained Al-Si-Ni powder was compacted in pellet and solid-state sintered at 530 °C at a pressure of ~200 MPa. The phase composition, structure, coefficient of linear thermal expansion and hardness sintered samples were determined. The coefficient of linear thermal expansion of samples formed after sintering is in the range from 14.7×10-6 K-1 to 17.5×10-6 K-1. It is typical for steel. The synthesized powder composite, contains intermetallic Al3Ni phase, crystalline aluminum, and silicon. The hardness of sintering samples is 113 HV.