Seeing how grain boundaries transform in a metal

Grain boundaries are one of the most prominent defects in engineering materials separating different crystallites, which determine their strength, corrosion resistance and failure. Typically, these interfaces are regarded as quasi two-dimensional defects and controlling their properties remains one of the most challenging tasks in materials engineering. However, more than 50 years ago the concept that grain boundaries can undergo phase transformations was established by thermodynamic concepts, but they have not been considered, since they could not be observed. Dr. Christian Liebscher, head of the group "Advanced Transmission Electron Microscopy" and his team members at the Max-Planck-Institut für Eisenforschung (MPIE), now found a way to directly observe grain boundary transitions experimentally. With colleagues from the Lawrence Livermore National Laboratory (LLNL), U.S., who modeled the grain boundary transformations, the researchers published their recent findings in Nature.

Seeing how grain boundaries transform in a metal

Grain boundaries are one of the most prominent defects in engineering materials separating different crystallites, which determine their strength, corrosion resistance and failure. Typically, ...

Thu 19 Mar 20 from Phys.org

Observations of grain-boundary phase transformations in an elemental metal

Nature, Published online: 18 March 2020; doi:10.1038/s41586-020-2082-6Atomic-resolution observations combined with simulations show that grain boundaries within elemental copper ...

Wed 18 Mar 20 from Nature News

Phase transformations observed at the interfaces between crystalline grains in pure metals

Nature, Published online: 18 March 2020; doi:10.1038/d41586-020-00765-3Interfaces between the tiny crystal grains that make up solid copper have been shown to change from one ...

Wed 18 Mar 20 from Nature News

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