Insight into the Mechanical Properties and Fracture Behavior of Pt3Al Coating by Experiment and Theoretical Simulation

The polycrystalline Pt3Al coating was prepared by the arc-melting method. The fracture mechanism of Pt3Al was investigated by the theoretical investigation. The interactomic potential of Pt3Al was built by the first-principles method. The measured fracture strength of Pt3Al is 449.5 MPa. The SEM image indicates that Pt3Al shows the lamellar cleavage fracture due to the large number of slips. The MD simulation indicates that this coating exhibits intermediate brittle fracture, which is close to the experiment. The cleavage fracture of Pt3Al is attributed to the atomic cluster. The development of microcracks on slip shear band is determinate by the thermal activation.

Automated summary

The polycrystalline Pt3Al coating prepared by the arc-melting method exhibits lamellar cleavage fracture with a measured fracture strength of 449.5 MPa. The theoretical investigation and MD simulation show that the cleavage fracture of Pt3Al is attributed to atomic cluster and thermal activation, respectively. This indicates a close correlation between experimental and theoretical results in understanding the fracture mechanism of Pt3Al.