Team uses severe deformation method on bulk magnetic alloys for high performance

phys.org | 6/13/2018 | Staff
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In a collaborative study involving Equal Channel Angular Extrusion (ECAE), a unique severe plastic deformation (SPD) process, researchers Dr. Ibrahim Karaman from Texas A&M University and Drs. Don Susan and Andrew Kustas of Sandia National Laboratories were able to improve the mechanical properties of magnetic alloys without changing their magnetic properties through microstructural refinement. This process has proven to be troublesome in the past.

Production of high-performance magnetic alloys and other intermetallics could prove particularly useful in aerospace and space exploration where materials must endure harsh environments including temperature extremes, shock, and vibration.

ECAE - Bar - Metallic - Material - Angle

ECAE forces a bar of metallic or polymeric material at a 90-degree angle through a die channel. This process induces SPD without any changes in the cross-sectional area of the sample.

Originally the researchers at Sandia National Laboratories and Texas A&M worked together on a different topic involving shape memory alloys. They quickly realized the potential in combining the strengths of their respective facilities on an entirely new study and subsequently applied the experiences to magnetic alloys.

Sandia - Need - Alloys - Bulk - Properties

Sandia saw the need to manufacture magnetic alloys in bulk demonstrating superior mechanical properties. Because ECAE allows the microstructure of materials to be drastically altered without affecting its cross-sectional area, larger samples with dimensions greater than one inch could be produced while improving mechanical properties simultaneously.

"I was initially skeptical about increasing the strength of the particular materials while keeping the magnetic properties unaffected," said Dr. Ibrahim Karaman, department head of the Department of Materials Science and Engineering at Texas A&M. "However, through collaboration with Sandia scientists, we were able to achieve what we dreamed of and that lead to a patent application for ECAE-processed soft magnetic alloys."

Researchers - Texas - A - M - ECAE

Researchers at Texas A&M carried out the ECAE processing and some microstructural characterization and mechanical testing. Sandia took these findings and administered...
(Excerpt) Read more at: phys.org
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