Cryogenic Stress-Driven Grain Growth Observed via Microcompression with in situ Electron Backscatter Diffraction

The deformation of materials at cryogenic temperature is of interest for space, arctic, and fundamental science applications. In this work, a custom-built cooling system attached to a commercial picoindenter was used for in situ cryogenic microcompression testing of equal-channel angular-pressed cop...

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Bibliographic Details
Main Authors: Frazer, D, Bair, JL, Homer, ER, Hosemann, P
Format: Article in Journal/Newspaper
Language:unknown
Published: eScholarship, University of California 2020
Subjects:
Mechanical Engineering
Resources Engineering and Extractive Metallurgy
Materials Engineering
Materials
Arctic
Online Access:https://escholarship.org/uc/item/8460b807
Description
Summary:The deformation of materials at cryogenic temperature is of interest for space, arctic, and fundamental science applications. In this work, a custom-built cooling system attached to a commercial picoindenter was used for in situ cryogenic microcompression testing of equal-channel angular-pressed copper with real-time electron backscatter diffraction. Stress-driven grain growth at cryogenic temperatures was observed during a series of elastic and plastic deformations. These results provide direct evidence for the previously predicted phenomenon, whereas previous ex situ examinations demonstrated coarsening after cryogenic loading when samples were not maintained at cryogenic temperatures between deformation and characterization.

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