Cyclic behavior of FeCoCrNiMn high entropy alloy coatings produced through cold spray

FeCoCrNiMn high entropy alloy powders were employed to produce coatings on carbon steel through high pressure cold spray (at 1100 degrees C and 7 MPa in temperature and pressure respectively). X-ray diffraction of the sprayed material revealed a dense coating with the retention of the original crystallographic structure. Once splatted, particles revealed high flattening ratio with consequent excellent adhesion of the coating to the substrate. Residual stresses and hardness increased through the thickness of the coating. The cyclic behavior of the coatings was evaluated through bending tests. The cyclic bending tests were performed by linearly increase the maximum deformation at a fixed number of loading cycles. Other bending tests were con-ducted at fixed maximum stroke at the same deformation levels indicated for the previous test up to the coating fracture. For ach 100 cycles the test was stopped in order to observe the coating surface to gain the possibility of evaluating the aspect of the superficial fracture. The fracture surface of the coatings was observed through scanning electron microscopy in order to describe the cracking features related to the different loading conditions imposed to the coatings.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

FeCoCrNiMn high entropy alloy powders were used to produce coatings on carbon steel by high pressure cold spray. The coatings exhibited dense crystallographic structure and excellent adhesion. The cyclic behavior of the coatings was evaluated through bending tests, and the cracking features under different loading conditions were observed through the fracture surface.