Deformation of CoCrFeNi high entropy alloy at large strain

Wang, Qingqing; He, Haiyan; Naeem, Muhammad; Lan, Si; Harjo, Stefanus; Kawasaki, Takuro; Nie, Yongxing; Kui, H. W.; Ungár, Tamás; Ma, Dong; Stoica, A. D.; Li, Qian; Ke, Yubin; Liu, C.T.; Wang, Xun-Li

doi:10.1016/j.scriptamat.2018.06.013

Cited by 69 publications

(16 citation statements)

References 25 publications

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“…Peak aberrations correlate well with the different elements of microstructures. [34][35][36] Therefore, we utilized CMWP software to resolve the convoluted neutron diffraction profiles and determine the different kinds of defects governing the deformation behaviors of the two HEAs during tensile loading. Figure 5(b) depicts the dislocation density and the formation probability of twins, while Figure 5(c) reflects the formation probabilities of extrinsic and intrinsic SFs, in both CoCrFeMnNi and CoCrFeNiGe 0.3 as functions of strain along the axial loading direction.…”

Section: Resultsmentioning

confidence: 99%

Element Effects of Mn and Ge on the Tuning of Mechanical Properties of High-Entropy Alloys

Lam

Tsai

Chen

et al. 2020

Metall Mater Trans A

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Substitution of Ge for Mn increases the elastic moduli of different {h k l} orientations of the CoCrFeMnNi-based high-entropy alloy. Our findings indicate that tuning minor element compositions may result in improved strength-ductility combination. The underlying deformation mechanisms of CoCrFeNiGe 0.3 were examined by in situ neutron diffraction and analysis of the associated diffraction profiles during tensile deformation. The strain-hardening response of CoCrFeNiGe 0.3 exhibited a dominant mechanism of mechanical twinning at moderate and large strains at room temperature. The evolution of the bulk work hardening rate was consistent with the convolutional multiple whole profile fitting results, which exhibited a continuous increase in twin formation probability. The microstructural development was also investigated by transmission electron microscopy, which revealed the formation of huge amounts of deformation twins in CoCrFeNiGe 0.3 at room temperature.

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Section: Resultsmentioning

confidence: 99%

Element Effects of Mn and Ge on the Tuning of Mechanical Properties of High-Entropy Alloys

Lam

Tsai

Chen

et al. 2020

Metall Mater Trans A

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“…As well as the difference in dimensions due to the change in hardness value, indents in CrFeCoNi show bowed edges with no observable cracks on the sample surface, suggesting ductility. Wang et al [30] showed that CrFeCoNi can undergo plastic deformation to high strains, with deformation by dislocation motion, and the operation of work hardening mechanisms at a significant rate, stemming from the low stacking fault energy [31] (approximately 30 mJ/m 2 despite the content of Ni [32]). In contrast, around indents in CrFeCoNiSn several cracks can apparently be observed, with it being particularly noteworthy that these seem to occur in the Ni-Sn phase (the lighter contrast phase in the image) only.…”

Section: Hardness Developmentmentioning

confidence: 99%

Improved Tribocorrosion Resistance by Addition of Sn to CrFeCoNi High Entropy Alloy

Muangtong

Namus

Goodall

2020

Metals

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Among the high entropy or complex concentrated alloys (HEAs/CCAs), one type of system is commonly based on CoCrFeNi, which as an equiatomic quaternary alloy that forms a single phase FCC structure. In this work, the effect of Sn in an equiatomic quinary system with CoCrFeNi is shown to lead to a great improvement in hardness and resistance to tribocorrosion. The addition causes a phase transition from a single FCC phase in CoCrFeNi to dual phase in CoCrFeNiSn with an Ni-Sn intermetallic phase, and a CoCrFeNi FCC phase. The presence of both the hard intermetallic and this ductile phase helps to resist crack propagation, and consequent material removal during wear. In addition, the high polarization resistance of the passive film formed at the surface and the high corrosion potential of the Ni-Sn phase contribute to preventing chloride corrosion attack during corrosion testing. This film is tenacious enough for the effect to persist under tribocorrosion conditions.

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“…Among the quaternary or "medium entropy alloy" systems, CoCrFeNi is of interest because it can form a single-phase fcc solid solution with phase stability to at least medium temperatures [17,18]. While CoCrFeNi has interesting deformation behavior at high strain [19,20], it was selected here mainly because it is a MPEA with a widely applicable basis for achieving tailored properties by adjusting the concentrations of the constituent elements [21] or by adding others, such as in Mn, Al, Cu, Ti, etc. [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Structure Zone Investigation of Multiple Principle Element Alloy Thin Films as Optimization for Nanoindentation Measurements

et al. 2020

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Multiple principal element alloys, also often referred to as compositionally complex alloys or high entropy alloys, present extreme challenges to characterize. They show a vast, multidimensional composition space that merits detailed investigation and optimization to identify compositions and to map the composition ranges where useful properties are maintained. Combinatorial thin film material libraries are a cost-effective and efficient way to create directly comparable, controlled composition variations. Characterizing them comes with its own challenges, including the need for high-speed, automated measurements of dozens to hundreds or more compositions to be screened. By selecting an appropriate thin film morphology through predictable control of critical deposition parameters, representative measured values can be obtained with less scatter, i.e., requiring fewer measurement repetitions for each particular composition. In the present study, equiatomic CoCrFeNi was grown by magnetron sputtering in different locations in the structure zone diagram applied to multinary element alloys, followed by microstructural and morphological characterizations. Increasing the energy input to the deposition process by increased temperature and adding high-power impulse magnetron sputtering (HiPIMS) plasma generators led to denser, more homogeneous morphologies with smoother surfaces until recrystallization and grain boundary grooving began. Growth at 300 °C, even without the extra particle energy input of HiPIMS generators, led to consistently repeatable nanoindentation load–displacement curves and the resulting hardness and Young’s modulus values.

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Deformation of CoCrFeNi high entropy alloy at large strain

Cited by 69 publications

References 25 publications

Element Effects of Mn and Ge on the Tuning of Mechanical Properties of High-Entropy Alloys

Element Effects of Mn and Ge on the Tuning of Mechanical Properties of High-Entropy Alloys

Improved Tribocorrosion Resistance by Addition of Sn to CrFeCoNi High Entropy Alloy

Structure Zone Investigation of Multiple Principle Element Alloy Thin Films as Optimization for Nanoindentation Measurements

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