Exceptional high-strain-rate tensile mechanical properties in a CrCoNi medium-entropy alloy

Gao, Peng; Ma, Zihao; Gu, Ji; Ni, Song; Suo, Tao; Li, Yulong; Song, Min; Mai, Yiu‐Wing; Liao, Xiaozhou

doi:10.1007/s40843-021-1798-6

Cited by 45 publications

(4 citation statements)

References 39 publications

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“…With the increase of strain rate, however, dislocations' slip is difficult to fully carry out and disappear at grain boundaries in a short time, which leads to local stress concentration, thus promoting twinning. 30) The dislocation density continues to increase with deformation; on the one hand, a large quantity of low-angle grain boundaries (LAGBs) (in grey) are formed; on the other hand, DRX occurs at twin boundaries (TBs) (in green) with the high storage energy, as shown in Fig. 9(b), namely, twinning-induced DRX.…”

Section: Processing Maps and Evolution Of Microstructurementioning

confidence: 99%

Hot Processing Maps and Texture Evolution during Hot Compression of CF170 Maraging Stainless Steel

Gao

Liu

et al. 2023

Mater. Trans.

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In this work, the hot processing maps of CF170 maraging stainless steel were generated by using flow stress data obtained from an isothermal compression experiment on the Gleeble-3800 hot compression simulator. The microstructure corresponding to the stable regions in the hot processing map was observed with an optical microscope. The results showed that the steel is susceptible to deformation temperature, strain, and strain rate, and the optimal hot working parameter is a strain rate range of 0.01³0.1 s ¹1 and a temperature range of 1350³1373 K when the strain is 0.6. In addition, the texture evolution of prior austenite during hot compression was investigated based on reconstructing a parent grain by Electron Back-Scattered Diffraction. The results showed that twinning-induced dynamic recrystallization is another mechanism except for strain-induced dynamic recrystallization at a higher strain rate. Further, the deformed microstructure with a Cube texture (1 0 0) ©0 1 0ª will preferentially nucleate, and the increase in temperature makes the Cube texture (1 0 0) ©0 1 0ª change to the rotated Cube texture (1 0 0) ©1 1 0ª, and the increase of strain rate inhibits the growth of recrystallized grains and weakens texture.

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Section: Processing Maps and Evolution Of Microstructurementioning

confidence: 99%

Hot Processing Maps and Texture Evolution during Hot Compression of CF170 Maraging Stainless Steel

Gao

Liu

et al. 2023

Mater. Trans.

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“…Some particularly noteworthy studies on the dynamic mechanical properties of MEAs and HEAs have been conducted in recent years [15,20,31]. The shear deformation resistance of a FeCoCrNiMn HEA was investigated using the Split Hopkinson Pressure Bar (SHPB) test, which revealed ASBs forming at shear strain values up to 7 [32].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Texture Evolution of a Dynamic Compressed Medium-Entropy CoCr0.4NiSi0.3 Alloy

Zhang,

Chen

et al. 2023

Crystals

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Focal research has been conducted on medium-entropy alloys (MEAs) that exhibit a balanced combination of strength and plasticity. In this study, the microstructure, dynamic mechanical properties, and texture evolution of an as-cast medium-entropy CoCr0.4NiSi0.3 alloy were investigated through dynamic compression tests at strain rates ranging from 2100 to 5100 s−1 using the Split Hopkinson Pressure Bar in order to elucidate the underlying dynamic deformation mechanism. The results revealed a significant strain rate effect with dynamic compressive yield strengths of 811 MPa at 2100 s−1, 849 MPa at 3000 s−1, 919 MPa at 3900 s−1, and 942 MPa at 5100 s−1. Grains were dynamically refined from 19.73 to 3.35 μm with increasing strain rates. The correlation between adiabatic temperature rise induced by dynamic compression and dynamic recrystallization was examined, revealing that the latter is not associated with adiabatic heating but rather with phase transition triggered by the dynamic stress during compression. The proportion of Σ3n (1 ≤ n ≤ 3) grain boundaries in deformation specimens increases with increasing strain rates during dynamic compression. The formation of specific three-node structures enhances both strength and plasticity by impeding crack propagation and resisting higher mechanical stress. In the as-cast state, significant anisotropy was observed in the MEA. As strain rates increased, it transited into a stable {111}<112> F texture. The exceptional dynamic properties of strength and plasticity observed in the as-cast state of the MEA can be attributed to a deformation mechanism involving a transition from dislocation slip to the formation of intricate arrangements, accompanied by interactions encompassing deformation nanotwins, stacking faults, Lomer–Cottrell locks, stair-rods, and displacive phase transformations at elevated strain rates.

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“…Designing heterogeneous structures in AMCs to introduce back stress strengthening is an effective way to evade the strength-ductility trade-off [11,12,14]. A kind of typical heterogeneous AMC contains grains of different sizes [15,16].…”

Section: Introductionmentioning

confidence: 99%

背应力平衡策略实现非均质Al-SiC复合材料的强塑性协同

et al. 2022

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Strength-ductility trade-off dilemma remains a significant obstacle to high-strength composites due to the undesirable dislocation storability. Herein, an ingenious nano-micro SiC-reinforced Al matrix composite (AMC) with heterogeneous grain structures of coarse and fine grains was designed via a novel deformation-driven metallurgy method. The accumulated geometrically necessary dislocations and the intragranularly dispersed SiC particles were tailored based on the principle of back stress amelioration, which was a key point to maintain the dynamic balance with the applied stress toward strength-ductility synergy. The ultimate tensile strength and uniform elongation of the designed SiC 5np-5μp /Al composite reached 324 MPa and 12.9%, respectively, and the strength was 181% as high as that of the SiC 10μp /Al with only 3% ductility loss. As such, a new strategy was provided herein to promote strength-ductility synergy via the further modified back stress.

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Exceptional high-strain-rate tensile mechanical properties in a CrCoNi medium-entropy alloy

Cited by 45 publications

References 39 publications

Hot Processing Maps and Texture Evolution during Hot Compression of CF170 Maraging Stainless Steel

Hot Processing Maps and Texture Evolution during Hot Compression of CF170 Maraging Stainless Steel

Microstructure and Texture Evolution of a Dynamic Compressed Medium-Entropy CoCr0.4NiSi0.3 Alloy

背应力平衡策略实现非均质Al-SiC复合材料的强塑性协同

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Exceptional high-strain-rate tensile mechanical properties in a CrCoNi medium-entropy alloy

Cited by 45 publications

References 39 publications

Hot Processing Maps and Texture Evolution during Hot Compression of CF170 Maraging Stainless Steel

Hot Processing Maps and Texture Evolution during Hot Compression of CF170 Maraging Stainless Steel

Microstructure and Texture Evolution of a Dynamic Compressed Medium-Entropy CoCr0.4NiSi0.3 Alloy

背应力平衡策略实现非均质Al-SiC复合材料的强塑 性协同

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背应力平衡策略实现非均质Al-SiC复合材料的强塑性协同