Controlling the high temperature deformation behavior and thermal stability of ultra-fine-grained W by re alloying

Johann Kappacher, Oliver Renk, Daniel Kiener, Helmut Clemens, Verena Maier-Kiener

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

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Due to their outstanding properties, ultra-fine-grained tungsten and its alloys are promising candidates to be used in harsh environments, hence it is crucial to understand their high temperature behavior and underlying deformation mechanisms. Therefore, advanced nanoindentation techniques were applied to ultra-fine-grained tungsten–rhenium alloys up to 1073 K. A continuous hardness decrease up to 0.2 Tm is rationalized by a still dominating effect of the Peierls stress. However, the absence of well-established effects of Rhenium alloying, resulting in a reduced temperature dependence of strength for coarse-grained microstructures, was interpreted as an indication for a diminishing role of kink-pair formation in ultra-fine-grained metals with sufficiently fine grain size. Despite slight grain growth in W, dislocation–grain boundary interaction was identified as the dominating deformation mechanism above 0.2 Tm. Interaction and accommodation of lattice dislocations with grain boundaries was affected by a reduced boundary diffusivity through alloying with Re.
Seiten (von - bis)2408-2419
FachzeitschriftJournal of Materials Research
PublikationsstatusVeröffentlicht - 25 Jan. 2021

Bibliographische Notiz

Funding Information:
The authors want to thank Plansee SE for providing the material. J.K. wants to thank Michael Wurmshuber for his help with deforming the materials via high-pressure torsion. D.K. acknowledges funding by the European Research Council under Grant Number 771146 (TOUGHIT). This program is supported by the Austrian Federal Ministries for Climate Action, Environment, Energy, Mobility, Innovation and Technology (BMK), and for Digital and Economic Affairs (BMDW), represented by the Austrian research funding association (FFG), and the federal states of Styria, Upper Austria, and Tyrol.

Publisher Copyright:
© 2021, The Author(s).

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