Open AccessMechanical Behavior of Polycrystalline Rhenium under 3-Points Bending at a Low Homological Temperature
Author(s) -
Peter Panfilov,
Yu. N. Gornostyrev,
Dmitry Zaytsev,
Gleb P. Panfilov,
V. P. Pilyugin
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/581/1/012028
Subject(s) - rhenium , materials science , crystallite , grain boundary , metallurgy , slip (aerodynamics) , powder metallurgy , plasticity , composite material , microstructure , thermodynamics , physics
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.