Bi-modal Structure of Copper via Room-Temperature Partial Recrystallization After Cryogenic Dynamic Compression

P ure copper was compressed at high strain rates (over ~3 × 10 3  s −1 ) under liquid nitrogen. This deformation resulted in bi-modal microstructures of ultrafine grains and abnormally grown micro grains, and in greater hardness (by ~30 Hv) than room-temperature, dynamically deformed copper. This bi...

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Veröffentlicht in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2016-04, Vol.47 (4), p.1600-1606
Hauptverfasser: Ahn, Dong-Hyun, Lee, Dong Jun, Kang, Minju, Park, Lee Ju, Lee, Sunghak, Kim, Hyoung Seop
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container_title Metallurgical and materials transactions. A, Physical metallurgy and materials science
container_volume 47
creator Ahn, Dong-Hyun
Lee, Dong Jun
Kang, Minju
Park, Lee Ju
Lee, Sunghak
Kim, Hyoung Seop
description P ure copper was compressed at high strain rates (over ~3 × 10 3  s −1 ) under liquid nitrogen. This deformation resulted in bi-modal microstructures of ultrafine grains and abnormally grown micro grains, and in greater hardness (by ~30 Hv) than room-temperature, dynamically deformed copper. This bi-modal microstructure is attributable to partial recrystallization at room temperature, activated by high-energy states and by twins generated at high Zener–Hollomon parameter conditions. This result demonstrates a new approach for producing bi-modally structured materials.
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subjects Characterization and Evaluation of Materials
Chemistry and Materials Science
Compressing
COMPRESSIVE PROPERTIES
Copper
COPPER (PURE)
DEFORMATION
Dynamic recrystallization
GRAIN SIZE AND SHAPE
Grains
HARDNESS
Liquid nitrogen
Materials Science
Metallic Materials
Metallography
Microstructure
MICROSTRUCTURES
Nanotechnology
RECRYSTALLIZATION
Strain rate
Structural Materials
Surfaces and Interfaces
Thin Films
title Bi-modal Structure of Copper via Room-Temperature Partial Recrystallization After Cryogenic Dynamic Compression
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