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dynamic strain aging
Although sometimes dynamic strain aging is used interchangeably with the Portevin–Le Chatelier effect (or serrated yielding), dynamic strain aging refers specifically to the microscopic mechanism that induces the Portevin–Le Chatelier effect. This strengthening mechanism is related to solid-solution strengthening and has been observed in a variety of fcc and bcc substitutional and interstitial alloys, metalloids like silicon, and ordered intermetallics within specific ranges of temperature and strain rate.〔Mesarovic, Sinisa (1995)“Dynamic Strain Aging and Plastic Instabilities.” J. Mech. Phys. Solids 43:671-701 No. 5〕
==Description of Mechanism==
In materials, the motion of dislocations is a discontinuous process. When dislocation meets obstacles (like forest dislocations) they are temporary arrested for a certain time. During this time solutes (such as interstitial particles) diffuse around the dislocations further strengthening the obstacles held on the dislocations. Eventually these dislocations will overcome these obstacles with sufficient stress and will quickly move to the next obstacle where they are stopped and the process can repeat again.〔Van Den Beukel, A. (1975)“Theory of the Effect of Dynamic Strain Aging on Mechanical Properties”. Phys. Stat. Sol. (a) 30 197:〕 This process's most well-known manifestations are Lüders bands and the Portevin–Le Chatelier effect. Though the mechanism is known to affect materials without these physical observations.〔Atkinson, JD and Yu, J.(1997) “The Role of Dynamic Strain-Aging in the Environment Assisted Cracking observed in Pressure Vessel Steels”. Fatigue Fracture Eng. Mater. Struct. Vol.20 No. 1:1-12〕
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