"So what's the Rockwell on this stuff?"
huh?
The alloys are strong yet unusually elastic, so they can deform more than other alloys and still return to their original shape. Engineers can also readily mold or bend the materials at room temperature into various shapes, a property called superplasticity.The materials also possess two characteristics desirable in machine parts that experience wild fluctuations in temperature, such as those in a spacecraft. While most metals expand with any rise in temperature, the new alloys expand very little between –200°C and 300°C. Moreover, conventional alloys deform different amounts at different temperatures, but the new materials show about the same deformation whether it's –200°C or 300°C.