Dynamic mechanical responses of the Al0·1CoCrFeNi high entropy alloy at cryogenic temperature

Jiang, Kun; Ren, Tengfei; Shan, G.B.; Ye, Tian; Chen, Lianyang; Wang, Cunxian; Zhao, Feng; Li, Jianguo; Suo, Tao

doi:10.1016/j.msea.2020.140125

Cited by 67 publications

(9 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Although the hardening effects of SFs may not be as effective as DTs [67], the high number density of SFs can still benefit the strain hardening by acting as the barrier to impede the propagation of dislocations [12]. Moreover, like the SFs, dislocations from four directions can be pinned by the LC locks, and other dislocations are also difficult to move near the LC locks, then resulting in dislocation pile-up [68], which also plays a positive role in the strengthening and strain hardening of HEAs/MEAs [3,[69][70][71]. When further increasing the annealing temperatures to 700 °C, the BF-TEM images in Fig.…”

Section: Resultsmentioning

confidence: 99%

Ultrastrong and ductile (CoCrNi)94Ti3Al3 medium-entropy alloys via introducing multi-scale heterogeneous structures

Zou¹,

Yang²,

Dong³

et al. 2023

Journal of Materials Science & Technology

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Ultrastrong and ductile (CoCrNi)94Ti3Al3 medium-entropy alloys via introducing multi-scale heterogeneous structures

Zou¹,

Yang²,

Dong³

et al. 2023

Journal of Materials Science & Technology

View full text Add to dashboard Cite

“…[40][41][42][43] Also, like the SFs, dislocations from four directions can be pinned by the LC locks, and other dislocations are hard to move near the LC locks, then causing dislocation pile-up, [42] which has a positive influence in the strengthening and strain hardening of MEAs/high-entropy alloys. [43][44][45] From the evidence obtained from above analysis, the refined grains, the interaction between dislocations and TiN nanoparticles, and the SFs and LCs are responsible for relatively higher yield strength (0.77 GPa). On the other hand, the formation of nanotwins, the interaction between nanotwin and TiN particles, and the concurrent process of GBS and the accommodation from intragranular dislocation in the softer fcc matrix come together to contribute to the excellent ductility (FS of 55.2%).…”

Section: Resultsmentioning

confidence: 99%

“…[ 40–43 ] Also, like the SFs, dislocations from four directions can be pinned by the LC locks, and other dislocations are hard to move near the LC locks, then causing dislocation pile‐up, [ 42 ] which has a positive influence in the strengthening and strain hardening of MEAs/high‐entropy alloys. [ 43–45 ]…”

Section: Resultsmentioning

confidence: 99%

Improved Strength–Ductility Synergy of a CoCrNi Medium‐Entropy Alloy by Ex Situ TiN Nanoparticles

et al. 2022

View full text Add to dashboard Cite

The introduction of ex situ reinforcement particles to increase the strength of alloys generally reduces ductility. Herein, a method to fabricate CoCrNi/TiN composite via spark plasma sintering (SPS) and rolling and annealing to achieve a superior combination of strength and ductility is presented. Under the as‐SPSed condition, the CoCrNi/TiN composites exhibit the fracture strain of 41.9%, yield strength (YS) of 0.48 GPa, ultimate tensile strength (UTS) of 0.88 GPa, and hardness of 232.0 Hv. After rolling at 25 °C for the thickness reduction of 50%, the alloy presents fracture strain of 6.9%, YS of 1.24 GPa, UTS of 1.41 GPa, and hardness (408.9 Hv). After rolling at 25 °C for the thickness reduction of 50%, and annealing at 700 °C for 1 h, a good combination of YS of 0.77 GPa, UTS of 1.01 GPa, and fractured strain of 55.2% can be obtained in the samples. The superior strength–ductility synergy can be attributed to the refined structure, the formation of lattices defects (i.e., stacking faults [SFs] and Lomer–Cottrell Locks (LCs)), the interaction of nanotwin–TiN particles, and the concurrent process of potential grain boundary sliding accommodated by intragranular dislocation in the softer face‐centered cubic (fcc) matrix.

show abstract

“…The chemically disordered complex structure inherent in high-entropy alloys also reduces the mean free path of atoms, increases the probability of point defect recombination, and lowers the vacancy supersaturation concentration. [50][51][52] This decrease in vacancy flux to the helium bubbles, coupled with inhibited helium atom mobility, leads to a reduction in the growth of the helium bubbles in multiple components and dual-phase HEAs. So that the sizes and density of helium bubbles in the present γ and γ dual-phase FeCoNiCr(Ni 3 Ti) 0.1 HEAs are smaller than those in singlephase FeCoNiCr.…”

Section: Coherent Nanoprecipitatesmentioning

confidence: 99%

Evolution of helium bubbles in FeCoNiCr-based high-entropy alloys containing γ′ nanoprecipitates

Feng 冯,

Jiang 蒋,

Hu 胡

et al. 2024

Chinese Phys. B

View full text Add to dashboard Cite

A series of high-entropy alloys (HEAs) containing nanoprecipitates of varying sizes were successfully prepared by a non-consuming vacuum arc melting method. In order to study the irradiation evolution of helium bubbles in the FeCoNiCr-based HEAs with γ' precipitates, samples were irradiated with 100 keV helium ions to a fluence of 5 × 1020 ions/m2 at 293 K and 673 K. And the room temperature irradiated samples were annealed at different temperatures to examine the diffusion behavior of helium bubbles. Transmission electron microscope (TEM) was employed to characterize the structural morphology of precipitated nanoparticles and the evolution of helium bubbles. Experimental results reveal that nanosized, spherical, dispersed, coherent and ordered L12-type Ni3Ti γ' precipitations were introduced in FeCoNiCr(Ni3Ti)0.1 HEAs by means of ageing treatments at temperatures between 1073-1123 K. Under the ageing treatment conditions applied in this work, γ' nanoparticles were precipitated in FeCoNiCr(Ni3Ti)0.1 HEAs with average diameters of 15.80 nm, 37.00 nm and 62.50 nm, respectively. The average sizes of helium bubbles observed in samples after 673 K irradiation were 1.46 nm, 1.65 nm and 1.58 nm, respectively. The improvement in the irradiation resistance of FeCoNiCr(Ni3Ti)0.1 HEAs was evidenced by the diminution in bubbles size. Furthermore, FeCoNiCr(Ni3Ti)0.1 HEAs containing γ' precipitates of 15.8 nm exhibited the minimum size and density of He bubbles, which can be ascribed to the considerable helium trapping effects of heterogeneous coherent phase boundaries. Subsequently, annealing experiments conducted after 293 K irradiation indicate that HEAs containing precipitated phases exhibit smaller apparent activation energies (Ea) for helium bubbles, resulting in larger helium bubble sizes. This study provides guidance on improving the irradiation resistance of L12-strengthened high-entropy alloys.

show abstract

Dynamic mechanical responses of the Al0·1CoCrFeNi high entropy alloy at cryogenic temperature

Cited by 67 publications

References 64 publications

Ultrastrong and ductile (CoCrNi)94Ti3Al3 medium-entropy alloys via introducing multi-scale heterogeneous structures

Ultrastrong and ductile (CoCrNi)94Ti3Al3 medium-entropy alloys via introducing multi-scale heterogeneous structures

Improved Strength–Ductility Synergy of a CoCrNi Medium‐Entropy Alloy by Ex Situ TiN Nanoparticles

Evolution of helium bubbles in FeCoNiCr-based high-entropy alloys containing γ′ nanoprecipitates

Contact Info

Product

Resources

About