Characteristics of dynamic softening during high temperature deformation of CoCrFeMnNi high-entropy alloy and its correlation with the evolving microstructure and micro-texture

Ghosh, Sumit; Patnamsetty, Madan; Somani, Mahesh C.; Peura, Pasi

doi:10.1016/j.jmrt.2021.11.089

Cited by 24 publications

(18 citation statements)

References 30 publications

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“…The microstructure of the specimens was examined using a Zeiss ULTRAplus field emission scanning electron microscope equipped for both elemental analysis (Oxford Instruments X-Max N 80 energy dispersive X-ray spectroscope (EDS)) and crystallographic analysis (Oxford Instruments' Symmetry® electron backscatter diffraction (EBSD) detector). The hot deformed specimens were segmented along the mid-plane parallel to the compression axis, as also explained in author's previous work [33]. The samples were first rough-polished using successive abrasive SiC papers, and in the final stages, fine-polished with 3 and 1 µm diamond suspensions.…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, the fully recrystallized, partially deformed, and deformed grains were identified using the grain average misorientation (GAM) maps. The GAM maps were constructed using the EBSD data according to the criteria explained in previous work [33]. A PANalytic Empyrean Multipurpose Diffractometer (Malvern Panalytical Ltd, Netherlands) X-ray diffraction (XRD) instrument was used to examine the crystallographic structure of the hot-rolled sample, operated on a Cu-K α radiation source at 45 kV and 40 mA conditions.…”

Section: Methodsmentioning

confidence: 99%

“…In earlier studies [15] the evolution of DRX along the prior grain boundaries, was observed due to the hot deformation of FCC Al 0.3 CoCrFeNi at 1303 K/5 × 10 −3 s -1 . In addition, Patnamsetty et al [29] and Ghosh et al [33] noticed the existence of 3 twin boundaries within DRX grains in the low SFE CoCrFeMnNi during hot deformation in DRX domain covering the temperature and strain rate ranges of 1223-1323 K and 10 -2 -5 × 10 -1 s -1 , respectively.…”

Section: Region B (Domain At 1423 K/6 ×10 -2 S -1 )mentioning

confidence: 99%

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Characterization of hot deformation behavior of Al0.3CoCrFeNi high-entropy alloy and development of processing map

Patnamsetty

Ghosh

Somani

et al. 2022

Journal of Alloys and Compounds

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Region B (Domain At 1423 K/6 ×10 -2 S -1 )mentioning

confidence: 99%

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Characterization of hot deformation behavior of Al0.3CoCrFeNi high-entropy alloy and development of processing map

Patnamsetty

Ghosh

Somani

et al. 2022

Journal of Alloys and Compounds

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“…The GAM criteria indicate the degree of orientation uniformity within each grain. The misorientation interval was from 0 • to 5 • , which is the basis for the grains' state, determination and fraction of their evaluation [11][12][13].…”

Section: Methodsmentioning

confidence: 99%

Effects of variated final temperature and workpiece thickness for hot rolling of aluminum alloy EN AW-8011

Kraner¹,

Cvahte²,

Šuštarič³

et al. 2023

Preprint

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The hot rolling in the process chain of the aluminium rolled products present the critical element of material quality and influence on productivity. The desire to increase the letter demand modifications of hot rolling, consequential changes of microstructure, crystallographic texture, mechanical and formability properties must be knowledge and consistently considered in planning the rolling process and rolled product. Achieving lower thicknesses of the hot-rolled band would enable fewer passes with cold rolling; consequently, hot rolling with the same number of passes will complete with lower temperatures. Microstructural and texture characterization with the optical microscope and scanning electron microscope for the hot-rolled band 3.25 mm the smaller grains appeared in the center of the cross-section, unlike for the hot-rolled band 6 mm, the smaller grains were detected on the upper and bottom position of the cross-section. Furthermore, the comparison shows also that the hot-rolled band 6 mm has 64 % of random texture components and 83 % of recrystallized grains, and the proportional adjustment for the hot-rolled band 3.25 mm has the 42 % of random texture components and 55 % of recrystallized grains. For the mechanical testing results, the elongation values in rolling and transverse directions significantly differ just in the case of a hot rolled band of 3.25 mm. Consequently, the earing results are more than 1.5 % higher for the hot-rolled band, 3.25 mm, than the hot-rolled band, 6 mm.

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“…Influence of Temperature on Residual Stresses KAM can be used to illustrate the overall defect density [43] and reflect the strain distribution in the microstructure. [44] Thus, it can be employed to observe the state of residual stresses within the specimen. Figure 15a depicts the KAM map of the as-extruded 7005 Al alloy before compression.…”

Section: Deformation Mechanismsmentioning

confidence: 99%

Prediction of Flow Stress and Characterizing the Deformation Mechanism of As‐Extruded 7005 Aluminum Alloy

Lin,

Tzeng

2024

Adv Eng Mater

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This study explores isothermal hot compression of the as‐extruded 7005 aluminum alloy within a temperature range of 573–823 K, with strain rates from 0.001 to 1 s−1 and a strain of 1.2. Three constitutive equations, employing hyperbolic sine, power law, and exponential functions, were formulated and compared to predict rheological peak stress accuracy and applicability. The results indicate that the hyperbolic sine function is suitable across all stress levels, the power law function for low stress (< 56 MPa), and the exponential function for high stress (> 56 MPa). Introducing a strain compensation function enhances hyperbolic sine function accuracy. The stress exponent (n) and activation energy (Q) decrease with increased deformation, indicating a transition in the deformation mechanism from early‐stage dislocation climb to later‐stage dislocation glide. At 773 K with strain > 0.6, the presence of precipitates maintains the n value at approximately 4. Solute atoms (Zn, Mg, and Zr) and precipitates (MgZn2 and Al3Zr) impede diffusion and dislocation motion, resulting in deformation activation energies surpassing pure aluminum. Additionally, kernel average misorientation maps demonstrate that higher deformation temperatures and lower strain rates reduce internal residual stresses.This article is protected by copyright. All rights reserved.

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Characteristics of dynamic softening during high temperature deformation of CoCrFeMnNi high-entropy alloy and its correlation with the evolving microstructure and micro-texture

Cited by 24 publications

References 30 publications

Characterization of hot deformation behavior of Al0.3CoCrFeNi high-entropy alloy and development of processing map

Characterization of hot deformation behavior of Al0.3CoCrFeNi high-entropy alloy and development of processing map

Effects of variated final temperature and workpiece thickness for hot rolling of aluminum alloy EN AW-8011

Prediction of Flow Stress and Characterizing the Deformation Mechanism of As‐Extruded 7005 Aluminum Alloy

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