A TEM in situ study of the softening of Tungsten by Rhenium
Source abstract
Abstract
Abstract Transmission electron microscopy in situ straining experiments have been carried out in a W–8% Re alloy, between 100 K and 300 K, in order to determine the origin of softening by alloying with Re. The geometry and kinetics of glide show that Re solutes do not induce any change of main slip plane. The only clearly visible effect of Re is the pinning of screw dislocations at super-jogs, which should a priori induce some hardening, but which in fact has only a weak effect. Local measurements of the applied shear stress at the scale of individual dislocations nevertheless confirm that softening is well reproduced in the micro-samples. It is thus concluded that softening results from a decrease of the strength of Peierls valleys with respect to pure W.
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Research context
OpenAlex topics: Advanced materials and composites · Advanced Materials Characterization Techniques · Surface and Thin Film Phenomena
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References (22)
Show source-provided references
1. Mechanical properties of arc-melted and electron-beam melted tungsten-base alloys
2. Yielding and fracture in tungsten and tungsten-rhenium alloys10.1016/0022-5088(69)90047-2 ↗
3. Review of ductilizing of group VIA elements by rhenium and other solutes
4. Solution softening mechanism of iridium and rhenium in tungsten at room temperature10.1016/0263-4368(91)90028-M ↗
5. Room-temperature tensile behavior of <100>oriented tungsten single crystals with rhenium in dilute solid solution
6. Dislocation structures in single-crystal tungsten and tungsten alloys10.1007/BF02900246 ↗
7. Temperature dependence of the plastic flow of high-purity tungsten single crystals10.3139/146.110362 ↗
8. Dislocation core symmetry and slip planes in tungsten alloys: ab-initio calculations and micro-cantilever bending experiments10.1016/j.actamat.2011.10.031 ↗
9. Plastic deformation of tungsten single crystals at low temperatures10.1016/0001-6160(66)90165-9 ↗
10. Geometry and kinetics of glide of screw dislocations in tungsten between 95K and 573K10.1016/j.actamat.2018.09.009 ↗
11. Effect of rhenium on the dislocation core structure in tungsten10.1103/PhysRevLett.104.195503 ↗
12. The influence of transition metal solutes on the dislocation core structure and values of the Peierls stress and barrier in tungsten
13. Solute-induced solid-solution softening and hardening in bcc tungsten10.1016/j.actamat.2017.09.019 ↗
14. Direct prediction of the solute softening-to-hardening transition in W-Re alloys using stochastic simulations of screw dislocation motion10.1088/1361-651X/aaaecf ↗
15. The chemistry of deformation: how solutes soften pure metals10.1126/science.1118616 ↗
16. Electronic origin of solid solution softening in bcc molybdenum alloys10.1103/PhysRevLett.94.136402 ↗
17. A TEM in situ study of alloying effects in iron – II solid solution hardening caused by high concentrations of Si and Cr10.1016/j.actamat.2013.01.049 ↗
18. Kinetics of dislocations in pure Fe, part I, in situ experiments at room temperature10.1016/j.actamat.2010.02.023 ↗
19. A TEM in situ study of alloying effects in iron - I solid-solution softening caused by low concentrations of Ni, Si and Cr10.1016/j.actamat.2013.01.048 ↗
20. An in situ study of hardening and softening of iron by carbon interstitials10.1016/j.actamat.2011.04.048 ↗
21. Kinetics of dislocations in pure Fe, part II, in situ experiments at low temperatures10.1016/j.actamat.2010.02.024 ↗
22. Tensile and compressive behavior of tungsten, molybdenum, tantalum and niobium at the nanoscale10.1016/j.actamat.2009.12.022 ↗