The importance of microstructural heterogeneities in the work hardening of ultrafine-grained aluminum, studied by in-situ TEM straining and mechanical tests
PBN-AR
Instytucja
Wydział Inżynierii Materiałowej (Politechnika Warszawska)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Materials Science and Engineering A-Structural Materials Properties Microstructure And Processing
ISSN
0921-5093
EISSN
Wydawca
Elsevier S.A.
DOI
Rok publikacji
2019
Numer zeszytu
Strony od-do
1-11
Numer tomu
764
Identyfikator DOI
Liczba arkuszy
0.3
Autorzy
Słowa kluczowe
en
Ultrafine-grained materials
Work hardening
Plastic deformation
Transmission electron microscopy
In-situ TEM straining
Streszczenia
Język
en
Treść
Technically pure aluminum was deformed by means of hydrostatic extrusion and incremental equal channel angular pressing in order to refine grains to a similar size. Different deformation routes resulted in microstructure varieties in terms of grain boundary characteristics, texture and local defects arrangements. These varieties affected the work hardening abilities measured macroscopically in the tensile test. In-situ TEM straining experiments were performed in order to capture dislocation occurrences in both samples and relate them to different values of strain hardening indices. As a next step, microstructure-work hardening dependence of multiple samples was evaluated. Our study shows that work hardening in ultrafine-grained materials can be assured only if dislocations can interact with each other. This is possible when particular deformation structures are established during the gain refinement of the material. These results give an insight how to design ultrafine-grained structures which are capable to further processing.
Inne
System-identifier
WUTfadb10a9bcc641529050de100eb8580e
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