A new study reveals the profound properties of a simple metal alloy. Scientists have measured the highest toughness ever recorded, of any material, while investigating a metallic alloy made of chromium, cobalt, and nickel (CrCoNi). Not only is the metal extremely ductile – which, in materials sci
on December 1, 2022.
CrCoNi is a subset of a class of metals called high entropy alloys . All the alloys in use today contain a high proportion of one element with lower amounts of additional elements added, but HEAs are made of an equal mix of each constituent element. These balanced atomic recipes appear to bestow some of these materials with an extraordinarily high combination of strength and ductility when stressed, which together make up what is termed “toughness.
Ritchie and George began experimenting with CrCoNi and another alloy that also contains manganese and iron nearly a decade ago. They created samples of the alloys then lowered the materials to liquid nitrogen temperatures and discovered impressive strength and toughness.
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