Vacancy diffusion in multi-principal element alloys: The role of chemical disorder in the ordered lattice

Thomas, Spencer L.; Patala, Srikanth

doi:10.1016/j.actamat.2020.06.022

Cited by 45 publications

(5 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This suggests that the solution energy of WMoTaNbV could be negative, but the magnitude of the trapping energy, ∼1.7 eV, would still suggest deep traps present in the material. This high trapping energy is also in line with observations of disorder-induced unique elemental diffusion properties in high entropy alloys [ 28 , 29 ]. Further studies are needed to determine the nature of the traps or the magnitude of solution energy in WMoTaNbV.…”

Section: Discussionsupporting

confidence: 87%

Irradiation Damage Independent Deuterium Retention in WMoTaNbV

et al. 2022

View full text Add to dashboard Cite

High entropy alloys are a promising new class of metal alloys with outstanding radiation resistance and thermal stability. The interaction with hydrogen might, however, have desired (H storage) or undesired effects, such as hydrogen-induced embrittlement or tritium retention in the fusion reactor wall. High entropy alloy WMoTaNbV and bulk W samples were used to study the quantity of irradiation-induced trapping sites and properties of D retention by employing thermal desorption spectrometry, secondary ion mass spectrometry, and elastic recoil detection analysis. The D implantation was not found to create additional hydrogen traps in WMoTaNbV as it does in W, while 90 at% of implanted D is retained in WMoTaNbV, in contrast to 35 at% in W. Implantation created damage predicted by SRIM is 0.24 dpa in WMoTaNbV, calculated with a density of 6.044×1022 atoms/cm3. The depth of the maximum damage was 90 nm. An effective trapping energy for D in WMoTaNbV was found to be about 1.7 eV, and the D emission temperature was close to 700 °C.

show abstract

Section: Discussionsupporting

confidence: 87%

Irradiation Damage Independent Deuterium Retention in WMoTaNbV

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Therefore, the atomic vacancy diffusion was inevitable due to each material having a close atomic radius number. Vacancy diffusion is one mechanism that involves the interchange of an atom from a normal lattice position to an adjacent vacant lattice site [ 36 ].…”

Section: Resultsmentioning

confidence: 99%

The Effect of Welding Current and Electrode Force on the Heat Input, Weld Diameter, and Physical and Mechanical Properties of SS316L/Ti6Al4V Dissimilar Resistance Spot Welding with Aluminum Interlayer

et al. 2021

View full text Add to dashboard Cite

Welding parameters obviously determine the joint quality during the resistance spot welding process. This study aimed to investigate the effect of welding current and electrode force on the heat input and the physical and mechanical properties of a SS316L and Ti6Al4V joint with an aluminum interlayer. The weld current values used in this study were 11, 12, and 13 kA, while the electrode force values were 3, 4, and 5 kN. Welding time and holding time remained constant at 30 cycles. The study revealed that, as the welding current and electrode force increased, the generated heat input increased significantly. The highest tensile-shear load was recorded at 8.71 kN using 11 kA of weld current and 3 kN of electrode force. The physical properties examined the formation of a brittle fracture and several weld defects on the high current welded joint. The increase in weld current also increased the weld diameter. The microstructure analysis revealed no phase transformation on the SS316L interface; instead, the significant grain growth occurred. The phase transformation has occurred on the Ti6Al4V interface. The intermetallic compound layer was also investigated in detail using the EDX (Energy Dispersive X-Ray) and XRD (X-Ray Diffraction) analyses. It was also found that both stainless steel and titanium alloy have their own fusion zone, which is indicated by the highest microhardness value.

show abstract

“…Previous computational simulations and experimental studies have found that vacancies, in some [35][36][37], but not all cases [38][39][40][41], experience sluggish diffusion in high-entropy alloys. We find that the vacancy in CuPt, AgPdPtIr, and AgAuCuPdPt experience sluggish diffusion if the temperature is low enough.…”

Section: Thermalization By Vacancy Migration or Global Swapmentioning

confidence: 95%

Role of vacancies in structural thermalization of binary and high-entropy alloys

Kristoffersen

Pedersen

2023

Preprint

View full text Add to dashboard Cite

Vacancy assisted atomic self-diffusion is a major structural thermalization mechanism in bulk metal alloys. Depending on alloy composition, the local atomic environments might stabilize vacancies to such extent that the vacancies become trapped and the atomic self-diffusion part of the thermalization process stalls. The consequence is that such alloys get kinetically trapped in disordered structures. In this study, we investigate equimolar AgAu, CuPt, AgPdPtIr, and AgAuCuPdPt alloy thermalizing using Metropolis Monte Carlo simulations in two approaches, one where the alloy structure changes through vacancy migration and one where the structure changes by swapping atomic pairs. By comparing the two approaches, we find that the vacancy is less effective at thermalizing alloys with more elements (i.e. AgPdPtIr and AgAuCuPdPt), more heterogeneous configurational energy distributions (i.e. CuPt and AgPdPtIr), and strong interactions between certain elements, e.g. Ir-Ir interactions in AgPdPtIr. In the case of AgPdPtIr, the vacancy cannot thermalize Ir-Ir neighbors even when the vacancy is mobile, because the vacancy has difficulty breaking individual Ir-Ir pairs apart.

show abstract

Vacancy diffusion in multi-principal element alloys: The role of chemical disorder in the ordered lattice

Cited by 45 publications

References 67 publications

Irradiation Damage Independent Deuterium Retention in WMoTaNbV

Irradiation Damage Independent Deuterium Retention in WMoTaNbV

The Effect of Welding Current and Electrode Force on the Heat Input, Weld Diameter, and Physical and Mechanical Properties of SS316L/Ti6Al4V Dissimilar Resistance Spot Welding with Aluminum Interlayer

Role of vacancies in structural thermalization of binary and high-entropy alloys

Contact Info

Product

Resources

About