lattice distortion enhanced yield strength in a refractory
Lattice distortion in a strong and ductile refractory high
Lattice-Distortion-Enhanced Yield Strength in a Refractory High-Entropy Alloy Journal Article Lee Chanho Chou Yi Kim George Advanced Materials
Get Price
Refractory High Entropy Alloys and Films for High
The deposited film showed formation of BCC solid solution which was verified through DFT calculations. The lattice distortion in CuMoTaWV film showed high hardness and nano-pillar compressive strength. Furthermore the tribological properties were enhanced at temperatures up
Get Price
Contribution of Lattice Distortion to Solid Solution
We present an experimental approach for revealing the impact of lattice distortion on solid solution strengthening in a series of body-centered-cubic (bcc) Al-containing refractory high entropy alloys (HEAs) from the Nb-Mo-Cr-Ti-Al system. By systematically varying the Nb and Cr content a wide range of atomic size difference as a common measure for the lattice distortion was obtained.
Get Price
Lattice‐Distortion‐Enhanced Yield Strength in a Refractory
Request PDF Lattice‐Distortion‐Enhanced Yield Strength in a Refractory High‐Entropy Alloy Severe distortion is one of the four core e ects in single-phase high-entropy alloys (HEAs) and
Get Price
INVITED ARTICLE Breakthrough applications of high
effect the single-crystal refractory alloy is expected to have temperature capability up to 1300 or even 1400 °C. Figure 3(b) shows the yield strength as functions of temperature for six HERAs and two commercial super-alloys Inconel 718 and CMSX-4. It can be seen that five refractory alloys are stronger than superalloys at above 1000 °C.
Get Price
Atomic and electronic basis for the serrations of
Jun 29 2017 · Refractory high-entropy alloys present attractive mechanical properties i.e. high yield strength and fracture toughness making them potential candidates for structural applications.
Get Price
Refractory High Entropy Alloys and Films for High
The deposited film showed formation of BCC solid solution which was verified through DFT calculations. The lattice distortion in CuMoTaWV film showed high hardness and nano-pillar compressive strength. Furthermore the tribological properties were enhanced at temperatures up
Get Price
Anomalous local distortion in BCC refractory high-entropy
Anomalous local distortion in BCC refractory high-entropy alloys Yang Tong1 Shijun Zhao1 Hongbin Bei1 Takeshi Egami1 2 3 Yanwen Zhang1 2 Fuxiang Zhang1 1Division of Materials Science and Technology Oak Ridge National Laboratory Oak Ridge TN 37831 USA. 2Department of Materials Science and Engineering The University of Tennessee Knoxville TN 37996 USA.
Get Price
Synthesis and Mechanical Characterization of a CuMoTaWV
Lattice distortion sluggish diffusion high entropy and cocktail effects have and reported an extraordinarily high yield strength of ∼10 GPa with improved ductility (∼30 compressional plastic strain) at combining Cu with refractory elements and its contribution toward the mechanical properties and (II) the enhancement of
Get PriceLattice‐Distortion‐Enhanced Yield Strength in a Refractory
The increase in yield strength is systematically and quantitatively studied in terms of lattice distortion using a theoretical model first‐principles calculations synchrotron X‐ray/neutron diffraction atom‐probe tomography and scanning transmission electron microscopy techniques.
Get Price
Effect of alloying elements on the structure and
Feb 24 2021 · From a microperspective the elastic modulus is determined by the strength of chemical bonds between constituent elements which in turn is determined by the valence electron of the alloying element. Enhanced bonding strength and strong interaction between atoms can improve the mechanical properties of the alloys.
Get Price
Design of high-strength refractory complex solid-solution
Mar 28 2018 · High-entropy alloys based on refractory elements may achieve higher temperature operation with superior creep strength. 3 Typical refractory high-entropy alloys exhibit a yield strength
Get Price
Mechanical properties of refractory high-entropy alloys
The measured density and lattice parameter for MoNbTaTiV are 9.29 g/cm3 and 3.224 Å which obey the rule of mixtures (ROM). The alloy exhibits high hardness at 443 Hv high yield strength at 1.4 GPa and good compressive fracture strength at 2.45 GPa with a fracture strain of 30 at room temperature.
Get Price
Ductilizing Refractory High Entropy Alloys
mechanical properties of simpler refractory alloys and refractory HEAs were made. The properties map shows the need for a ductile refractory high entropy due to the current available materials are either too brittle or have low yield strength at elevated temperatures. Four binary alloys with compositions MoTi Mo 0.5 Ti MoNb and Mo 0.5
Get PriceSpinodal-modulated solid solution delivers a strong and
Wavy dislocations form walls that entangle with slip bands promoting strain hardening and delocalizing plastic strain. A simultaneous combination of high yield strength (1.1 GPa) and tensile strain to failure (28 ) is achieved these values are among the best reported so far for refractory high-entropy alloys.
Get Price
Lattice‐Distortion‐Enhanced Yield Strength in a Refractory
Lattice‐Distortion‐Enhanced Yield Strength in a Refractory High‐Entropy Alloy Show authors by Chanho Lee Yi Chou George Kim Michael Gao Ke An Jamieson M Brechtl Chuan Zhang Wei Chen Jonathan D Poplawsky Gian Song Yang Ren Yi Chia Chou Peter Liaw
Get Price
Current Status of Structural Materials
(3) Structure severe lattice distortion effect alter properties to an extent Lattice distortion 1) Affects properties-Large solution hardening in the heavily distorted lattice Hardness and strength effectively increase Yong Zhang et al. Adv. Eng. Mat. P 2008 Vickershardenss Mixturerule MPa HEA MPa NbMoTaW 1 790 4 455
Get Price
Enhanced Strength of a Mechanical Alloyed NbMoTaWVTi
Apr 25 2018 · On the other hand refractory HEAs have exhibited advantages of high yield strength at room and elevated temperature. For example Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20 refractory HEAs produced by vacuum arc-melting exhibit compressive yield strengths of 1058 MPa and 1246 MPa respectively with plasticities of less than 2 at room temperature 5 .
Get PriceSynthesis and Mechanical Characterization of a CuMoTaWV
Lattice distortion sluggish diffusion high entropy and cocktail effects have and reported an extraordinarily high yield strength of ∼10 GPa with improved ductility (∼30 compressional plastic strain) at combining Cu with refractory elements and its contribution toward the mechanical properties and (II) the enhancement of
Get Price
E-TreePeter K. Liaw
Lee C Chou Y Kim G et al. (2020) Lattice-Distortion-Enhanced Yield Strength in a Refractory High-Entropy Alloy. Advanced Materials (Deerfield Beach Fla.). e Lee C Kim G Chou Y et al. (2020) Temperature dependence of elastic and plastic deformation behavior of a refractory high-entropy alloy. Science Advances. 6
Get Price
(PDF) Enhanced mechanical properties of HfMoTaTiZr and
Another refractory HEA HfNbTaTiZr having very different properties was developed later 26 . It has a lower density (9.94 g/cm 3 ) and exhibits high compression yield strength (s 0.2 ¼ 929 MPa) and very high plasticity (ε > 50 ) at RT but its yield strength at high temperatures is not pleasing (yield strength < 100 MPa at 1200 C).
Get Price
Enhanced Strength of a Mechanical Alloyed NbMoTaWVTi
Apr 25 2018 · On the other hand refractory HEAs have exhibited advantages of high yield strength at room and elevated temperature. For example Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20 refractory HEAs produced by vacuum arc-melting exhibit compressive yield strengths of 1058 MPa and 1246 MPa respectively with plasticities of less than 2 at room temperature 5 .
Get PriceINVITED ARTICLE Breakthrough applications of high
effect the single-crystal refractory alloy is expected to have temperature capability up to 1300 or even 1400 °C. Figure 3(b) shows the yield strength as functions of temperature for six HERAs and two commercial super-alloys Inconel 718 and CMSX-4. It can be seen that five refractory alloys are stronger than superalloys at above 1000 °C.
Get Price
Nanoscale precipitates as sustainable dislocation sources
Mar 10 2020 · The overall yield strength is σ = σ 0 Δ σ O r σ 0 being the value in the absence of Orowan strengthening. By substituting L = 11 nm L = 25 nm L = 100 nm into Eq. 3 we obtain a relation between yield strength (with σ 0 ≈ 850 MPa) and precipitate diameter as
Get Price
Spinodal-modulated solid solution delivers a strong and
Wavy dislocations form walls that entangle with slip bands promoting strain hardening and delocalizing plastic strain. A simultaneous combination of high yield strength (1.1 GPa) and tensile strain to failure (28 ) is achieved these values are among the best reported so far for refractory high-entropy alloys.
Get Price
Lattice distortion in a strong and ductile refractory high
Importantly results indicate that this HEA exhibits the high yield strength and ductility at both room and high temperatures (up to 900 °C). Furthermore the effects of the high mixing entropy on the mechanical properties are discussed and quantified in terms of lattice distortions and interatomic interactions of the NbTaTiV HEA via first
Get Price
Design of high-strength refractory complex solid-solution
Mar 28 2018 · High-entropy alloys based on refractory elements may achieve higher temperature operation with superior creep strength. 3 Typical refractory high-entropy alloys exhibit a yield strength
Get Price
Design of high-strength refractory complex solid-solution
Mar 28 2018 · High-entropy alloys based on refractory elements may achieve higher temperature operation with superior creep strength. 3 Typical refractory high-entropy alloys exhibit a yield strength
Get Price
(PDF) Enhanced mechanical properties of HfMoTaTiZr and
Another refractory HEA HfNbTaTiZr having very different properties was developed later 26 . It has a lower density (9.94 g/cm 3 ) and exhibits high compression yield strength (s 0.2 ¼ 929 MPa) and very high plasticity (ε > 50 ) at RT but its yield strength at high temperatures is not pleasing (yield strength < 100 MPa at 1200 C).
Get Price
