Featuring a non-crystalline amorphous structure, bulk metallic glasses can be as strong or even stronger than steel, as malleable as plastics, conduct electricity, and resist corrosion. But they are often brittle, with poor and uneven fatigue resistance. Researcher at Lawrence Berkeley National Laboratory and Caltech found that a bulk metallic glass based on palladium displayed fatigue strength as good as the best composite bulk metallic glasses and comparable to regular polycrystalline structural alloys. Palladium has high “bulk-to-shear” stiffness ratio that counteracts the intrinsic brittleness of glassy materials because the energy needed to form shear bands is significantly lower than the energy required to turn these shear bands into cracks, the researchers say.(...)
26 novembre 2013
Other materials stories that may be of interest | The American Ceramic Society
Other materials stories that may be of interest | The American Ceramic Society
