Metal defects can be eliminated by cyclic loading

"It’s a well-known characteristic of metals that repeated bending in the same place can cause the material to weaken and eventually break; this phenomenon, known as metal fatigue, can cause serious damage to metal components subjected to repeated stress."

But now, researchers from MIT, Carnegie Mellon University, Xi’an Jiaotong University, and elsewhere have found that under certain conditions, repeated slight stretching of nanoscale metal pieces can actually strengthen a material by eliminating defects in its crystalline structure." - MIT News

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