Tailoring grain growth and solid solution strengthening of single-phase CrCoNi medium-entropy alloys by solute selection

Hu, Guichao; Zeng, Liangcai; Du, Hui; Liu, Xinwang; Wu, Yidong; Gong, Pan; Zhao, Fan; Hu, Qiang; George, E.P.

doi:10.1016/j.jmst.2020.02.073

Cited by 58 publications

(7 citation statements)

References 73 publications

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“…The coarse grains contributed to the weakening of the strengthening effect from the grain boundaries (Ref 30 , 31 ). According to the reduction in the solid solution atoms in the γ phase, the solid solution strengthening effect of the γ phase decreased during PHT (Ref 32 ). Therefore, the hardness decline of the Ni-based matrix s was attributed to grain growth and a reduction in the number of solid solution atoms in the γ phase.…”

Section: Resultsmentioning

confidence: 99%

Effect of Post-Heat Treatment on the Microstructure and Mechanical Properties of Laser-Deposited WxC + Ni-Based Composite Thin Walls

Chen

Pan

et al. 2020

J. of Materi Eng and Perform

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This paper reports the effect of post-heat treatment (PHT) on laser-deposited WxC + Ni-based composite thin walls. The PHT at 700, 800, and 900°C was conducted to modify the microstructure and mechanical properties of the composite. The results showed that the as-deposited composite had a weak flexural strength and plasticity due to the brittle nature of the eutectic phase. The eutectic phase consisted of M 7 C 3 , M 2 C, and a small amount of the c phase. However, after PHT at a certain temperature (e.g., 700 or 800°C), the eutectic phase gradually disappeared, and carbides, such as M 7 C 3 and M 2 C, tended to be distributed uniformly in the c matrix, which improved the flexural strength of the composite. Nevertheless, after the PHT at 900°C, the flexural strength of the composite displayed a downward trend, which was mainly because of the severe softening of the c phase. In addition, the plasticity of this composite continuously improved as the eutectic phase disappeared and the c phase softened. Based on the above results, we proposed a PHT at 800°C for 1 h as an optimal process for this WxC + Ni-based composite.

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Section: Resultsmentioning

confidence: 99%

Effect of Post-Heat Treatment on the Microstructure and Mechanical Properties of Laser-Deposited WxC + Ni-Based Composite Thin Walls

Chen

Pan

et al. 2020

J. of Materi Eng and Perform

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“…The alloy was resistant to recrystallization and was stable up to a temperature of 550 °C. Hu et al [ 45 ] emphasized that solute drag and the Zener pinning effect retarded recrystallization and grain growth during the annealing process.…”

Section: Discussionmentioning

confidence: 99%

Recrystallization of Hot-Rolled 2A14 Alloy during Semisolid Temperature Annealing Process

et al. 2023

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In this study, in order to provide proper parameters for the preparation of semisolid billets, the semisolid annealing of hot-rolled 2A14 Al alloy was investigated. The microstructure was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) with an X-ray energy dispersive spectrometer (EDS) and electron backscattered diffraction (EBSD), and scanning transmission electron microscopy (STEM). The XRD results showed that, with an increase in temperature, the θ-Al2Cu equilibrium gradually dissolved in the matrix. The EDS results of SEM and STEM showed a coarse θ-Al2Cu phase, ultrafine precipitate Al(MnFeSi) or (Mn, Fe)Al6 phase, and atomic clusters in the microstructure. The EBSD results showed that the recrystallization mechanism was dominated by continuous static recrystallization (CSRX), homogeneous nucleation occurred when the sample was heated to near solidus temperature, and CSRX occurred at a semisolid temperature. In the process of recrystallization, the microtexture changed from the preferred orientation to a random orientation. Various experimental results showed that static recrystallization (SRX) occurred at a semisolid temperature due to the blocking effect of atomic clusters on the dislocation slip, and the Zener drag effect of fine precipitates on low-angle grain boundaries (LAGBs) disappeared with melting at a semisolid temperature.

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“…Kuang et al [43] reported the Zener pinning pressure on the migration of grain boundary that cast Al-Mn-Fe-Si alloy, the alloy was resistant to recrystallization and stable up to a temperature of 550 ℃. Hu et al [44] emphasized that solute-drag and Zener pinning effect retarded recrystallization and grain growth during annealing process.…”

Section: The Second Phases In 2a14 Al Alloymentioning

confidence: 99%

Recrystallization of Hot-Rolled 2A14 Alloy During Semi-Solid Temperature Annealing Process

Liu¹,

Jiang²,

Zhang³

et al. 2023

Preprint

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In this paper, in order to provide proper parameters for the preparation of semi-solid billets, the semi-solid annealing of hot-rolled 2A14 Al alloy was investigated. The microstructure was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) with X-ray energy dispersive spectrometer (EDS) and electron backscattered diffraction (EBSD), scanning transmission electron microscope (STEM). XRD results show that with the increase of temperature, equilibrium θ-Al2Cu gradually dissolved in the matrix. The EDS results of SEM and STEM show that there were coarse θ-Al2Cu phase, ultra-fine precipitate Al(MnFeSi) or (Mn, Fe)Al6 phase and atomic clusters in the microstructure. EBSD results show that the recrystallization mechanism was dominated by continuous static recrystallization (CSRX), the homogeneous nucleation occurred when the sample was heated to near solidus temperature, and CSRX happened in the semi-solid temperature. In the process of recrystallization, the micro-texture changed from preferred orientation to random orientation. A variety of experimental results show that static recrystallization (SRX) occurred at semi-solid temperature due to the blocking effect of atomic clusters on dislocation slip and the Zener drag effect of fine precipitates on low angle grain boundaries (LAGBs) disappeared with melting at semi-solid temperature.

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Tailoring grain growth and solid solution strengthening of single-phase CrCoNi medium-entropy alloys by solute selection

Cited by 58 publications

References 73 publications

Effect of Post-Heat Treatment on the Microstructure and Mechanical Properties of Laser-Deposited WxC + Ni-Based Composite Thin Walls

Effect of Post-Heat Treatment on the Microstructure and Mechanical Properties of Laser-Deposited WxC + Ni-Based Composite Thin Walls

Recrystallization of Hot-Rolled 2A14 Alloy during Semisolid Temperature Annealing Process

Recrystallization of Hot-Rolled 2A14 Alloy During Semi-Solid Temperature Annealing Process

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