Microstructures and elevated temperature mechanical properties of AlSi12Cu4Ni2 fabricated by laser powder bed fusion

Abstract

The key properties of cast AlSi12Cu4Ni2 alloy are elevated temperature performance. In this paper, the microstructures and mechanical properties of a multiphase AlSi12Cu4Ni2 alloy formed by laser powder bed fusion (LPBF) were investigated from ambient temperature to 350 °C. The effects of LPBF parameters and microstructure in AlSi12Cu4Ni2 samples on mechanical properties were systematically studied. The best operating conditions (P = 300 W, v = 1800 mm/s) are obtained. The results show that fine equiaxed grains can be obtained by LPBF forming. The strengthening mechanisms were revealed. The thermal stability of the Al7Cu4Ni and Al3CuNi phases are conducive to the excellent elevated-temperature tensile strength. The high temperature wear properties of AlSi12Cu4Ni2 alloy were investigated. Abrasive wear is dominant wear mechanism of AlSi12Cu4Ni2 alloy at high temperatures.