Mechanical Behavior of Polycrystalline Rhenium under 3-Points Bending at a Low Homological Temperature

21st Winter School on Continuous Media Mechanics

计算机技术

Panfilov, Peter^1 ; Gornostyrev, Yuri N^1^2 ; Zaytsev, Dmitry^1^3 ; Panfilov, Gleb P^1 ; Pilyugin, Vitalii P^1^2

Ural Federal University, Lenin Ave. 51, Yekaterinburg

620000, Russia^1

Institute of Metalphysics of Ural Branch of Russian Academy of Science, Kovalevskaya Str. 18, Yekaterinburg

620219, Russia^2

Institute of High-Temperature Electrochemistry of Ural Branch of Russian Academy of Science, Akademicheskaya Str. 20, Yekaterinburg

620990, Russia^3

关键词: Brittle solids;    Coarse-grained;    Intergranular fracture;    Mechanical behavior;    Mechanical behaviour;    Metallurgical technologies;    Polycrystalline;    Prismatic slip;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/581/1/012028/pdf
DOI  :  10.1088/1757-899X/581/1/012028

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Mechanical behaviour of polycrystalline rhenium under 3-points bending at such low homological temperature as room is discussed. Two metallurgical technologies (electron beam melting and powder metallurgy) were used for the samples preparation. Fine-grained samples (PM metal) exhibit some plasticity prior the failure, while coarse-grained ones (EBM metal) behave like a brittle solid. The intergranular fracture is the fracture mode of rhenium in both cases. Basal slip and prismatic slip of dislocations are not active in rhenium at low homological temperature, but the grain boundary sliding occurs under these conditions. Therefore, polycrystalline rhenium cannot be machined at room temperature despite the growth of grain boundary cracks are braked in the samples due to grain boundary sliding.