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Caratterizzazione archeometallurgica di alcuni manufatti di ferro del santuario di Pyrgi
No full textEffect of dispersed particles on TiAl alloys fracture behavior
Full text linkγTiAl based alloys are very attractive for structural applications at high temperatures. The addition to the selected alloy of dispersed alumina particles increases the yield strength and the elastic modulus of γTiAl alloys but affects their fracture behavior by favoring the propagation of brittle fracture. The analysis of the fracture surface revealed that the addition to oxide particle, during component production by means of investment casting, favors brittle fracture propagation by intensifying stresses and by increasing the quantity of shrinkage cavities inside the casting
Effect of heat treatment on mechanical properties of FeMnAlC alloys
Full text linkFeMnAlC alloys exhibit an attractive strength/ductility combination, low density and some of them show good oxidation behavior at high temperatures. In this paper the effect of a solubilization treatment at 1030 °C followed by aging at 550 °C on the mechanical properties of two alloys belonging to this system, has been evaluated. The results of the investigation revealed that the steel characterized by the higher quantity of Mn and Al shows, after heat treatment, the formation of intermetallic phases that make the alloy very brittle. Considering the obtained results, it is evident that optimizing the alloy chemical composition is of paramount importance to guarantee a high fracture toughness if the steel works for limited time intervals at high temperature
Indagini archeometallurgiche preliminari su manufatti in piombo provenienti dal santuario etrusco di Pyrgi
No full textCatani
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