Nanoporous Au-Pt alloys with pore- and ligament size down to few nanometers were fabricated by dealloying Ag-Au-Pt. Owing to the small structure size and large specific surface area, the surface stress and its variation give rise to significant stress and strain in the bulk of these materials. In fact, dilatometry experiments find electrochemical actuation with large reversible strain amplitude. The linear strain reaches approximately 1.3% and strain energy density is up to 6.0 MJ/m(3). The associated stresses may approach the elastic limit of the alloy.

Influence of ultrasonic inoculation treatment on distribution of sulphur in Fe-S alloy was mainly studied. Results showed that Ultrasonic treatment could reduce the segregation degree of sulfur in Fe-S alloy and make the distribution more uniform. When the ultrasonic treatment time was 60s, sulfur segregation was in the lowest of 0.3799, and homogeneity was in the maximum of 0.5470.While treated with ultrasonic power of 150W, sulfur segregation was 0.5068, and sulfur segregation was improved, but homogeneity of sulfur decreased to 0.3411, overall homogeneity distribution of sulfur decreased.