A ductile high entropy alloy strengthened by nano sigma phase

Zhang, Lu; Huo, Xiaofeng; Wang, Anguo; Du, X.H.; Zhang, Li; Li, Wanpeng; Zou, Naifu; Wan, Gang; Duan, Guosheng; Wu, Baolin

doi:10.1016/j.intermet.2020.106813

Cited by 62 publications

(12 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, the σ phase is difficult to nucleate and grow in recrystallized grains. Due to the mass of dislocations inside the non-recrystallized grains, many nucleation checkpoints can be provided for the σ phase [ 33 ]. The growth of the σ phase is mainly affected by atomic diffusion, which often needs grain boundaries and twin boundaries to provide paths.…”

Section: Resultsmentioning

confidence: 99%

The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting

et al. 2023

View full text Add to dashboard Cite

In this work, two Ni-based superalloys with 13 wt.% and 35 wt.% Co were prepared via selective laser melting (SLM), and the effects of Co on the microstructure and mechanical properties of the additively manufactured superalloys were investigated. As the Co fraction increased from 13 wt.% to 35 wt.%, the average grain size decreased from 25.69 μm to 17.57 μm, and the size of the nano-phases significantly increased from 80.54 nm to 230 nm. Moreover, the morphology of the γ′ phase changed from that of a cuboid to a sphere, since Co decreased the γ/γ′ lattice mismatch from 0.64% to 0.19%. At room temperature, the yield strength and ultimate tensile strength of the 13Co alloy reached 1379 MPa and 1487.34 MPa, and those of the 35Co alloy were reduced to 1231 MPa and 1350 MPa, while the elongation increased by 52%. The theoretical calculation indicated that the precipitation strengthening derived from the γ′ precipitates made the greatest contribution to the strength.

show abstract

Section: Resultsmentioning

confidence: 99%

The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Wang et al [77] stated that the harder σ phase could hinder the dislocation movement during the tensile process and finally enhance the strength of duplex stainless steel, but the elongation would decrease. Zhang et al [78] also reported that the low volume fraction of the nano-σ particles in FCC HEAs can strengthen the alloy with less sacrifice of ductility. Therefore, the Al 0.4 CrFe 1.5 MnNi 0.5 Mo 0.1 alloy possesses better mechanical strength without sacrificing lots of ductility.…”

Section: Effects Of the Nial Precipitates And σ Phase On Deformation Behavior At High-temperaturementioning

confidence: 98%

Effect of Mo on the Mechanical and Corrosion Behaviors in Non-Equal Molar AlCrFeMnNi BCC High-Entropy Alloys

2022

View full text Add to dashboard Cite

Co-free body-centered cubic (bcc) high-entropy alloys (HEAs) are prepared, and the elevated mechanical property and corrosion property of the Al0.4CrFe1.5MnNi0.5Mox (x = 0 and 0.1) alloys are studied. The Vickers hardness (HV) of the as-homogenized state is between HV 350 and HV 400. Both alloys are provided with nano-scale NiAl-rich B2 precipitates which contribute to the strength at high-temperature. In addition, adding Mo in the present alloy strengthens by σ phase. Al0.4CrFe1.5MnNi0.5Mo0.1 exhibited outstanding tensile properties, with a yield strength of 413 MPa and ultimate tensile strength of 430 MPa in the elevated tensile test at 600 °C, which is better than that of Al0.4CrFe1.5MnNi0.5 alloy. Through potentiodynamic polarization testing in 0.5 M H2SO4 solution and electrochemical impedance spectroscopy (EIS), it is shown that adding Mo can effectively reduce the corrosion current density and improve the impedance of passive film, since the passivation layer is formed and stable.

show abstract

“…Other brittle intermetallic compounds, such as the sigma phase, Laves phases, have been also frequently observed in HEAs, which generally deteriorate the ductility Microstructures and Deformation Mechanisms of FCC-Phase High-Entropy Alloys DOI: http://dx.doi.org/10.5772/intechopen.104822 [76][77][78][79][80]. Similarly, if the size, distribution, and morphology of intermetallic compounds can be tailored via controlling the chemical composition and thermomechanical treatment, an excellent combination of strength and ductility can be achieved in multi-component HEAs.…”

Section: Brittle Intermetallic Compoundsmentioning

confidence: 99%

Microstructures and Deformation Mechanisms of FCC-Phase High-Entropy Alloys

Ming¹,

Zheng²,

Wang³

2023

High Entropy Materials - Microstructures and Properties

View full text Add to dashboard Cite

Strength and ductility are the most fundamental mechanical properties of structural materials. Most metallurgical mechanisms for enhancing strength often sacrifice ductility, referred to as the strength–ductility trade-off. Over the past few decades, a new family of alloys—high-entropy alloys (HEAs) with multi-principal elements, has appeared great potential to overcome the strength–ductility trade-off. Among various HEAs systems, CrFeCoNi-based HEAs with a face-centered cubic (fcc) structure exhibit a great combination of strength, ductility, and toughness via tailoring microstructures. This chapter summarizes recent works on realizing strength–ductility combinations of fcc CrFeCoNi-based HEAs by incorporating multiple strengthening mechanisms, including solid solution strengthening, dislocation strengthening, grain boundary strengthening, and precipitation strengthening, through compositional and microstructural engineering. The abundant plastic deformation mechanisms of fcc HEAs, including slips associated with Shockley partial dislocation and full dislocations, nanotwinning, martensitic phase transformation, deformation-induced amorphization, and dynamically reversible shear transformation, are reviewed. The design strategies of advanced HEAs are also discussed in this chapter, which provides a helpful guideline to explore the enormous number of HEA compositions and their microstructures to realize exceptional strength–ductility combinations.

show abstract

A ductile high entropy alloy strengthened by nano sigma phase

Cited by 62 publications

References 33 publications

The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting

The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting

Effect of Mo on the Mechanical and Corrosion Behaviors in Non-Equal Molar AlCrFeMnNi BCC High-Entropy Alloys

Microstructures and Deformation Mechanisms of FCC-Phase High-Entropy Alloys

Contact Info

Product

Resources

About