Dislocations in Grain Boundary Regions: The Origin of Heterogeneous Microstrains in Nanocrystalline Materials

Autor: Zhenbo Zhang, Michael Preuss, Bertalan Jóni, Julia Ivanisenko, Tamás Ungár, Éva Ódor, Géza Tichy, Gábor Ribárik, Diana Farkas, Sree Harsha Nandam

Publikováno v: Metallurgical and materials transactions / A, 51 (1), 513-530
Zhang, Z, Ódor, É, Farkas, D, Jóni, B, Ribárik, G, Tichy, G, Nandam, S-H, Ivanisenko, J, Preuss, M & Ungar, H T 2020, ' Dislocations in Grain Boundary Regions : The Origin of Heterogeneous Microstrains in Nanocrystalline Materials ', Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, vol. 51, pp. 513-530 . https://doi.org/10.1007/s11661-019-05492-7

Nanocrystalline materials reveal excellent mechanical properties but the mechanism by which they deform is still debated. X-ray line broadening indicates the presence of large heterogeneous strains even when the average grain size is smaller than 10

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ebe3ee46f191cbc7ec9483c2f9c6037a
http://hdl.handle.net/10831/50611

Orientation-dependent evolution of the dislocation density in grain populations with different crystallographic orientations relative to the tensile axis in a polycrystalline aggregate of stainless steel

Autor: Tamás Ungár, Alexandru D. Stoica, Géza Tichy, Xun-Li Wang

Publikováno v: Acta Materialia. 66:251-261

Line profile analysis was carried out on neutron diffraction patterns collected by the energy-dispersive method for an in situ tensile-deformed AISI-316 stainless steel specimen. The experiments were carried out at the VULCAN engineering beam line of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6b7b4eb47c73bf2682a1957acbfa3b49
https://doi.org/10.1016/j.actamat.2013.11.012

Work softening in nanocrystalline materials induced by dislocation annihilation

Autor: Hahn Choo, Géza Tichy, Wolfgang Pantleon, Tamás Ungár, Peter K. Liaw, L. Li

Publikováno v: Scripta Materialia. 64:876-879

Cold rolling reduces the quantity of dislocation densities in Ni–18% Fe alloys prepared by electrochemical deposition. The dislocation density evolution proposed earlier for the linearly decreasing work-hardening rate during stage III is revisited.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::afa2f4fa2c2b6e4eaa7e82784afa3eac
https://doi.org/10.1016/j.scriptamat.2011.01.022

Microstructure evolution during cold rolling in a nanocrystalline Ni–Fe alloy determined by synchrotron X-ray diffraction

Autor: T. Ungár, Ying Yang, Géza Tichy, János Lendvai, Yang Ren, Peter K. Liaw, Hahn Choo, L. Li, James R. Morris, Yandong Wang

Publikováno v: Acta Materialia. 57:4988-5000

Stress softening after cold rolling is observed in an electrodeposited nanocrystalline Ni–Fe alloy. The grain-size distribution becomes much broader after the cold rolling. Microstructure changes, though moderate, such as simultaneously decreased d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f987e36d59dfaf15144aa55d9bd825f2
https://doi.org/10.1016/j.actamat.2009.07.002

Stability of microstructure in silver processed by severe plastic deformation

Autor: János L. Lábár, Jeno Gubicza, Cheng Xu, Terence G. Langdon, Nguyen Q. Chinh, Géza Tichy, Zoltan Hegedüs

Publikováno v: International Journal of Materials Research. 100:884-887

The stability of the microstructure of pure silver processed by equal channel angular pressing at room temperature was studied by transmission electron microscopy and X-ray line profile analysis. After processing by 1 pass the microstructure was stab

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f35c77e1c4b2cc2e6af00e4e01cda87c
https://doi.org/10.3139/146.110113