Use of neutrons to analyze high entropy modified metal alloys


ORNL researchers used neutrons at the lab’s spallation neutron source to analyze high-entropy modified metal alloys with improved strength and ductility, or the ability to stretch, under high stress without failure. . Credit: Rui Feng / ORNL, US Department of Energy

Researchers at the Oak Ridge National Laboratory have developed a method of adding nanostructures to high entropy metal alloys, or HEAs, that improve both strength and ductility, that is, the ability to deform or stretch under tensile stress without failure.

The results, published in Science, open a promising avenue for tailoring HEA properties using small gradient structures to produce improved high performance metals for a wide range of applications.

Conventional metallic materials, including HEA (metals composed of five or more elements), become less ductile or more brittle as their strength increases.

Scientists used neutron diffraction methods at ORNL’s spallation neutron source to confirm that tiny defects, called stacking defects, easily form in an HEA compared to conventional fine-grained alloys.

“The stacking defects improved the plasticity of the test alloy while contributing to increased strength and hardening,” said Ke An of ORNL. “Industries that could greatly benefit from this are the automotive, power distribution and aerospace industries.”

Computer discovery of complex alloys could accelerate the path to green aviation

More information:
Qingsong Pan et al, High entropy alloy with gradient cell structure with outstanding strength and ductility, Science (2021). DOI: 10.1126 / science.abj8114

Provided by the Oak Ridge National Laboratory

Quote: Using Neutrons to Analyze High Entropy Modified Metal Alloys (2021, November 2) retrieved November 3, 2021 from

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