Ultrasonic irradiation of nanoporous Au

•Nanoporous Au samples were fabricated by dealloying of Ag-Au parent alloys.•Only a portion of samples was dealloyed to allow effective ultrasonic irradiation.•Samples were subjected to ultrasonic irradiation using a leaning ultrasonic horn.•Ultrasonic irradiation makes nanoporous Au coarsen already at room temperature.•Ultrasonic irradiation and annealing induce analogous coarsening processes.