Micro-mechanisms of microstructural damage due to low cycle fatigue in CoCuFeMnNi high entropy alloy

Bahadur, Fateh; Biswas, Krishanu; Gurao, N.P.

doi:10.1016/j.ijfatigue.2019.105258

Cited by 55 publications

(9 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, Niendorf et al [11] showed pronounced martensitic transformation upon cycling dualphase Fe 50 Mn 30 Co 10 Cr 10 and the appearance of planar slip as well as partial reversibility were assumed to strongly affect the material behavior. Bahadur et al [12] reported an increase in the intragranular misorientation and dislocation density with increasing strain amplitude. This led to the accumulation of damage and intergranular cracking in equiatomic CoCuFeMnNi [12].…”

Section: Introductionmentioning

confidence: 98%

“…Bahadur et al [12] reported an increase in the intragranular misorientation and dislocation density with increasing strain amplitude. This led to the accumulation of damage and intergranular cracking in equiatomic CoCuFeMnNi [12]. Moreover, interaction of dislocations with the solute atmosphere, copper-rich nano-clusters and grain boundaries were shown to have retarded slip reversibility, thereby dictating the cyclic deformation behavior [12].…”

Section: Introductionmentioning

confidence: 98%

“…This led to the accumulation of damage and intergranular cracking in equiatomic CoCuFeMnNi [12]. Moreover, interaction of dislocations with the solute atmosphere, copper-rich nano-clusters and grain boundaries were shown to have retarded slip reversibility, thereby dictating the cyclic deformation behavior [12]. Wang et al [13] studied LCF cracking behavior of CoCrFeMnNi with three different grain sizes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High-temperature low cycle fatigue behavior of an equiatomic CoCrFeMnNi high-entropy alloy

Chauhan

Litvinov

et al. 2020

Materials Science and Engineering: A

View full text Add to dashboard Cite

In the present work, low cycle fatigue (LCF) behavior of an equiatomic CoCrFeMnNi high entropy alloy (HEA) is correlated to the microstructural evolution at 550 °C. The fully reversed strain-controlled fatigue tests were conducted in air under strain amplitudes ranging from 0.2 to 0.8%. The measured cyclic stress response showed three distinct stages which include initial cyclic hardening followed by a quasi-stable cyclic response until failure. The rate and amount of cyclic hardening increased with the increase in strain amplitude. In comparison to common austenitic stainless steels, CoCrFeMnNi HEA shows comparable strength and improved LCF lifetimes at similar testing conditions. Electron-microscopy investigations after failure reveal no noticeable change in grain size, texture and annealing twins density. Initial cyclic hardening is attributed to dislocation multiplication and dislocation-dislocation as well as dislocationsolute atom interaction. The quasi-stable cyclic response is associated with the equilibrium between dislocation multiplication and annihilation, which also leads to the formation of heterogeneous dislocation structures such as ill-defined walls and cells, particularly at higher strain amplitudes. Besides this, the material exhibits serrated plastic-flow due to interactions between mobile dislocations and diffusing solute 2 atoms (such as Cr, Mn and Ni). Lastly, segregation in the form of Cr-and NiMn-enriched phases were observed near grain boundaries, which appears to have a detrimental effect on the fatigue life.

show abstract

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High-temperature low cycle fatigue behavior of an equiatomic CoCrFeMnNi high-entropy alloy

Chauhan

Litvinov

et al. 2020

Materials Science and Engineering: A

View full text Add to dashboard Cite

show abstract

“…A comparative study about the effect of strain amplitude on LCF behaviour of high entropy alloy also shows that intragranular misorientation and hence GND density increases with an increase in strain amplitude. 39 It was also observed and validated through the Schmid factor by the same author that an increase in strain amplitude facilitates multiple slip system activation due to the accumulation of cyclic plastic strain. So, the micromechanical deformation behaviour in terms of crystallographic misorientation, GND and slip system activation due to the LCF was extensively studied in the literature.…”

Section: Introductionmentioning

confidence: 87%

Effect of microstructural constituents and morphological characteristics on low cycle fatigue behaviour of inter-critically annealed 20MnMoNi55 steel

Basu

Acharyya

Sahoo

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

The effect of varying microstructural parameters on the cyclic behaviour of dual-phase steels was studied on the basis of experimental and micromechanical finite-element simulated results. The initial bainitic morphology of as-received 20MnMoNi55 steel was transformed into ferrite and martensite through proper inter-critical heat treatment procedures. Strain-controlled low cycle fatigue tests were conducted at room temperature with different strain amplitudes at a specific strain rate of 10−3/s. The cyclic stress–strain curve, obtained through joining the peak stresses of hysteresis loops corresponding to different strain amplitude, shows an increase in strain hardening with an increase in volume fraction of martensite. Whereas the rate of cyclic softening, considering the decrease in stress amplitude with respect to elapsed cycles, increases with increasing strain amplitude. Inclusive of all affecting microstructural parameters, an original microstructure-based representative volume element associated with a crystal plasticity-based material model was adopted for conducting micromechanical finite-element simulation. In addition to several parameters associated with a crystal plasticity model, consideration of initial geometrically necessary dislocation density in constituent phases resulted in the accurate prediction of a hysteresis loop at low strain amplitude as compared with the experimental results. A variation of stress triaxiality built up in ferrite matrix with martensite fraction along with deformation inhomogeneity between ferrite and martensite was also observed through a strain partitioning phenomenon obtained from finite-element simulated results.

show abstract

“…Thus, HEAs have shown great potential practical applications as future structural materials, which in many cases will invariably depend on their fatigue resistance that determines component lifetimes. In pursuit of HEAs with exceptional fatigue resistance, efforts in studying the fatigue behavior of HEAs have been made recently [17][18][19][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. Despite these works, a full clear picture of fatigue mechanisms in HEAs remains absent, mainly because of the varied fatigue testing conditions and various HEA systems in those reports.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Behavior and Mechanisms of High-Entropy Alloys

Feng

Liaw

2022

High Entropy Alloys & Materials

View full text Add to dashboard Cite

Fatigue failures of structural materials pose enormous risks to in-service structures, as well as human lives. The development of advanced durable structural materials with fatigue resistance has important social impact. The novel concept of high-entropy alloys (HEAs) has engendered considerable attention due to their exhibited unusual mechanical properties, and correspondingly opening a new road to design fatigue-resistant structural materials. The present work discusses and reviews the current findings on fatigue behavior and mechanisms of HEAs. Based on the understanding of fatigue-resistant favorable deformation mechanisms in HEAs, the perspectives from the viewpoint of materials design are provided to advance the development of fatigue-resistant HEAs, and future works are also suggested.

show abstract

Micro-mechanisms of microstructural damage due to low cycle fatigue in CoCuFeMnNi high entropy alloy

Cited by 55 publications

References 54 publications

High-temperature low cycle fatigue behavior of an equiatomic CoCrFeMnNi high-entropy alloy

High-temperature low cycle fatigue behavior of an equiatomic CoCrFeMnNi high-entropy alloy

Effect of microstructural constituents and morphological characteristics on low cycle fatigue behaviour of inter-critically annealed 20MnMoNi55 steel

Fatigue Behavior and Mechanisms of High-Entropy Alloys

Contact Info

Product

Resources

About