Strength, Ductility, and Fracture Mode of Ternary FeAl Alloys

1994 ◽  
Vol 364 ◽  
Author(s):  
J. H. Schneibel ◽  
E. P. George ◽  
E. D. Specht ◽  
J. A. Horton
Keyword(s):  
Binary Alloy ◽  
Fracture Mode ◽  
Single Phase ◽  
Ternary Alloys ◽  
Transgranular Fracture ◽  
Atomic Size ◽  
Solid Solution Strengthening ◽  
Ternary Element ◽  
Solution Strengthening ◽  
Ternary Alloying

AbstractIron aluminides with the composition Fe-45Al-5X-0.2B-0.1Zr (at. %), where X stands for the first row transition metals Ti, V, Cr, Mn, Fe, Co, Ni, Cu, were examined at room temperature with respect to their strength, ductility, environmental sensitivity, and fracture mode. The extruded materials were annealed at 1273 K to produce similar grain sizes and subsequently at 673 K to reduce the amount of quenched in vacancies. All alloys were essentially single phase. Their solid solution strengthening was found to correlate with the atomic size misfit derived from the lattice parameters. The “binary” alloy Fe-45Al-0.2B-0.1Zr exhibited predominantly transgranular fracture. Ternary alloying additons with atomic numbers less than that of Fe tended to enhance intergranular fracture, whereas those with atomic numbers higher than that of Fe favored substantial amounts of transgranular fracture. Tensile testing in a partial pressure of dry oxygen increased the ductilities of the ternary alloys only slightly, whereas the ductility of the binary alloy increased from about 8 to about 19%. The ductilities in air correlated inversely with the yield strength. However, those alloys exhibiting substantial amounts of transgranular fracture always showed higher ductilities than those fracturing intergranularly. We interpret our fracture results in terms of yield strengths and ternary element site occupations.

Alloy Modeling and Experimental Correlation for Ductility Enhancement in NiAl

1988 ◽  
Vol 133 ◽  
Author(s):  
R. Darolia ◽  
D. F. Lahrman ◽  
R. D. Field ◽  
A. J. Freeman
Keyword(s):  
Room Temperature ◽  
Boundary Energy ◽  
Ternary Alloys ◽  
Total Electron ◽  
Solid Solution Strengthening ◽  
Band Structure Calculations ◽  
Solution Strengthening ◽  
Anti Phase Boundary ◽  
Structure Calculations ◽  
Electron Band Structure

ABSTRACTSingle crystals of stoichiometric NiAl and NiAl+V alloys were tested in compression and tension from room temperature to 871°C to determine deformation behavior. The dislocations were predominately <100> in the plastically deformed specimens. Attempts to ductilize NiAl by the addition of vanadium are described. The lowering of the anti-phase boundary energy by vanadium addition to NiAl, believed to promote the formation of <111> dislocations, was predicted by the all electron self consistent total electron band structure calculations. The vanadium additions caused considerable solid solution strengthening in NiAl, rendering the ternary alloys more brittle than stoichiometric NiAl.

Physical and Mechanical Properties of Two-Phase Zr-Cr-Mn Alloys

1998 ◽  
Vol 552 ◽  
Author(s):  
A. Goldberg ◽  
D. E. Luzzi
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Physical And Mechanical Properties ◽  
Laves Phase ◽  
Two Phase ◽  
Tem Analysis ◽  
Atomic Size ◽  
Solid Solution Strengthening ◽  
Solution Strengthening ◽  
Mn Content

ABSTRACTThe Zr-Cr-Mn system is used to explore the effect of a lowered SFE on the room temperature mechanical properties of a Laves phase using elements of similar atomic size. The ternary Zr-Cr-Mn diagram in the region from 0 to 12 at. % Mn is first determined and it is shown that Mn substitutes only for Cr in the Laves phase. TEM analysis of the density of stacking fault energy related defects such as annealing twins indicates that Mn substitution for Cr in ZrCr2 lowers the SFE of the cubic Laves phase. Mechanical testing of the two phase alloys is used to explore the effects of Mn content and the volume fraction of each phase on the ductility and fracture behavior in compression. It is found that the mechanical properties are well-described by a model incorporating solid solution strengthening in a ductile-brittle two phase alloy.

A role of atomic size misfit in lattice distortion and solid solution strengthening of TiNbHfTaZr high entropy alloy system

2022 ◽  
Vol 210 ◽  
pp. 114470
Author(s):  
Pramote Thirathipviwat ◽  
Shigeo Sato ◽  
Gian Song ◽  
Jozef Bednarcik ◽  
Kornelius Nielsch ◽  
...  
Keyword(s):  
Solid Solution ◽  
Lattice Distortion ◽  
Alloy System ◽  
High Entropy Alloy ◽  
Atomic Size ◽  
High Entropy ◽  
Solid Solution Strengthening ◽  
Solution Strengthening

scholarly journals Solid solution strengthening and deformation behavior of single-phase Cu-base alloys under tribological load

2020 ◽  
Vol 185 ◽  
pp. 300-308 ◽  
Author(s):  
Stephan Laube ◽  
Alexander Kauffmann ◽  
Friederike Ruebeling ◽  
Jens Freudenberger ◽  
Martin Heilmaier ◽  
...  
Keyword(s):  
Solid Solution ◽  
Deformation Behavior ◽  
Single Phase ◽  
Solid Solution Strengthening ◽  
Solution Strengthening

Materials Design for High-Strength Mg-Based Alloys by Understanding from Ab Initio Calculation

2005 ◽  
Vol 488-489 ◽  
pp. 131-134 ◽  
Author(s):  
Tokuteru Uesugi ◽  
Kenji Higashi
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
High Strength ◽  
Materials Design ◽  
Deformation Mechanisms ◽  
Peierls Stress ◽  
Atomic Size ◽  
Solid Solution Strengthening ◽  
Solution Strengthening ◽  
Generalized Stacking Fault

The applications of ab initio calculations for deformation mechanisms of Mg-based alloys are discussed. First, Peierls stress of pure magnesium is calculated from generalized stacking fault (GSF) energies obtained by ab initio calculations. Second, materials design is applied to develop new Mg-based alloys exhibiting high strength. The atomic size factors of some Mg-based solid solutions are calculated by ab initio calculations as a first step of searching most effective solute element for the solid-solution strengthening.

scholarly journals Quantification of Solid Solution Strengthening and Internal Stresses through Creep Testing of Ni-Containing Single Crystals at 980 °C

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1130
Author(s):  
Uwe Glatzel ◽  
Felix Schleifer ◽  
Christian Gadelmeier ◽  
Fabian Krieg ◽  
Moritz Müller ◽  
...  
Keyword(s):  
Solid Solution ◽  
Grain Boundary ◽  
Creep Strength ◽  
Single Phase ◽  
Configurational Entropy ◽  
Strengthening Mechanisms ◽  
Two Phase ◽  
Solid Solution Strengthening ◽  
The Matrix ◽  
Solution Strengthening

Various alloy compositions were cast as single crystals in a Bridgman vacuum induction furnace and creep tested at 980 °C: pure Ni, the equiatomic alloys CoCrNi and CrMnFeCoNi (Cantor alloy), single-phase fcc (Ni) solid solution alloys (with the composition of the matrix-phase of CMSX-3 and CMSX4), and two-phase Ni-based superalloys CMSX-3 and CMSX-4. Due to the single-crystal state, grain size effects, grain boundary sliding, and grain boundary diffusion can be excluded. The results identify two major strengthening mechanisms: solid solution strengthening and other mechanisms summarized as precipitation hardening. Configurational entropy does not increase creep strength: The Cantor alloy, with the highest configurational entropy of all alloys tested, shows a weak and similar creep strength at 980 °C in comparison to pure Ni with zero configurational entropy. The element Re is a very effective strengthener, both in single-phase fcc (Ni) solid solution alloys as well as in two-phase superalloys. Quantitative estimations of different strengthening mechanisms: internal back stress, misfit stresses, Orowan bowing, and γ’-phase cutting (in the case of two-phase superalloys) are presented. Finite element simulations allow estimating the influence of solid solution strengthening of the matrix on the creep behavior of the two-phase superalloys.

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