Deformation and failure by weaving dislocation networks in body-centered-cubic tungsten

Cao, Hailin; Lu, Wenjun; Yang, Min; Wang, Shuai

doi:10.1016/j.matdes.2022.111182

Cited by 4 publications

(2 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The material parameters of W used in the simulations are listed as shear modulus μ = 161 GPa, Poisson ratio υ = 0.28, the magnitude of Burgers vector b = 0.27 nm, and mass density m = 19250 / kg m . 3 The uniaxial loading is applied along the 100 orientation at the constant strain rate of  10 4 e = s −1 . The time step for solving the governing equation is set as 10 −7 s at the beginning and then is automatically updated during the simulation.…”

Section: Simulations Detailsmentioning

confidence: 99%

“…It is well known that the initial dislocation microstructures play an important role in yield behavior during plastic deformation. The variation in the initial dislocation density can govern the transition from ductile to brittle behavior [1], which is often accompanied by processes such as Frank-Read source multiplication [2] and dislocation network formation [3]. Thus, great efforts have been devoted to building the relationship between dislocation microstructures and macroscopic mechanical properties [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Confluent effects of initial dislocation microstructures on yield behavior in single-crystal tungsten at high temperature

Xiang,

Yu,

Cui

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

Though it is well known that initial dislocation microstructures play an important role in the deformation behavior of materials, how dislocation microstructures affect the macroscopic properties is still subjected to intensive research due to their complexity. In this work, we use discrete dislocation dynamics (DDD) to understand the effect of initial dislocation microstructures on the dynamic yield behavior of single-crystal tungsten above the critical temperature (800 K). DDD results suggest that the dislocation source length l_"0" and the dislocation density ρ_"0" are responsible for the initial yield stress and the flow stress of tungsten under dynamic loading, respectively. As ρ_"0" and l_"0" increase, the plastic yield mechanism transforms from dislocation-source activation into dislocation-dislocation interactions, resulting in the initial yield stress decreasing and the flow stress increasing. The confluent effects of ρ_"0" and l_"0" on the steady-state flow stress "σ" _"flow" can be unified by a linear relationship between "σ" _"flow" and 〖√("ρ" _"0" ) "log" 〗⁡("l" _"0" /"2b" ). Our results could be a valuable piece that connects dynamic yield behavior to the initial dislocation microstructures.

show abstract

Section: Simulations Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Confluent effects of initial dislocation microstructures on yield behavior in single-crystal tungsten at high temperature

Xiang,

Yu,

Cui

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

show abstract

Role of thermal stress-driven dislocation and low-angle grain boundary migration in surface plastic deformation and grain orientation evolution of tungsten under thermal shock

Ren,

Nie,

Wang

et al. 2025

International Journal of Plasticity

View full text Add to dashboard Cite

Revealing the room temperature superplasticity in bulk recrystallized molybdenum

Chen,

Li,

Jin

et al. 2023

Nat Commun

View full text Add to dashboard Cite

Body-centered cubic refractory metallic materials exhibit excellent high-temperature strength, but often suffer from brittle intergranular fracture due to the recrystallization-induced enrichment of trace elements at grain boundaries (GBs). Here, we report a fully-recrystallized pure molybdenum (Mo) material with room temperature (RT) superplasticity, fabricated by a facile method of powder metallurgy, Y-type hot rolling and annealing. By engineering the ultralow concentration of O at GBs, the inherent GB brittleness of Mo can be largely eliminated, which, in conjunction with high fractions of soft texture and low angle GBs, enables a significant development of ordered dislocation networks and the effective dislocation transmission across low angle GBs. Synergy of these factors greatly suppress the brittle intergranular fracture of Mo, contributing to an enhanced deformability of 108.7% at RT. These findings should have general implication for fabricating a broad class of refractory metals and alloys toward harsh applications.

show abstract

Deformation and failure by weaving dislocation networks in body-centered-cubic tungsten

Cited by 4 publications

References 42 publications

Confluent effects of initial dislocation microstructures on yield behavior in single-crystal tungsten at high temperature

Confluent effects of initial dislocation microstructures on yield behavior in single-crystal tungsten at high temperature

Role of thermal stress-driven dislocation and low-angle grain boundary migration in surface plastic deformation and grain orientation evolution of tungsten under thermal shock

Revealing the room temperature superplasticity in bulk recrystallized molybdenum

Contact Info

Product

Resources

About