Liquid has structure, which may be key to understanding metallic glass

phys.org | 2/22/2019 | Staff
baileyboo (Posted by) Level 3
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Researchers have found that liquid has structure in certain circumstances, and that this structure significantly influences the mysterious and complex formation of metallic glasses.

Moldable like plastic but strong like metal, metallic glasses are a relatively new class of materials made from complex, multicomponent alloys. Their unique properties come from how their atoms settle into a random arrangement when they cool from a liquid to a solid. But controlling this process—and fully capitalizing on these materials—has proved tricky, since so much is still unknown about what happens in the cooling process.

Study - Nature - Communications - Answers

A new study, published in Nature Communications, provides some answers.

The researchers, led by Judy Cha, the Carol and Douglas Melamed Assistant Professor of Mechanical Engineering & Materials Science, found that metallic glasses in the liquid state will periodically form crystalline structures—their freely moving atoms arrange themselves into certain patterns. This happens at the interface of the liquid and the solid—that is, when the molten material has partially solidified, the adjacent liquid forms a structure that causes the solid portion to grow up to 20 times faster than it otherwise would.

Gap - Knowledge - Cha

"We're highlighting that gap in our knowledge," said Cha,...
(Excerpt) Read more at: phys.org
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