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Advances in Microstructure and Mechanical Properties of Ni-Based Superalloys
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Advances in Microstructure and Mechanical Properties of Ni-Based Superalloys

A Special Issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 20 January 2027 | Viewed by 2212

Editors

Prof. Dr. Yutian Ding

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Interests: Ni-based wrought superalloys; laser additive manufacturing of nickel-based superalloys; copper and copper alloys; biomedical zinc and magnesium alloys
Dr. Yubi Gao

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Interests: Ni-based wrought superalloy; laser additive manufacturing of nickel-based superalloys; deformation mechanisms; tariloring of twin boundary
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue, entitled “Advances in Microstructure and Mechanical Properties of Ni-Based Superalloys”, focuses on recent advances in understanding the microstructure and mechanical behavior of Ni-based superalloys, as well as the underlying mechanisms governing their strength and toughness. Ni-based superalloys are designed to achieve superior performance through solid solution strengthening, precipitation strengthening, and other strengthening mechanisms enabled by precise melting, forging, and heat treatment processes. These alloys retain stable mechanical properties under high temperatures and pressures and exhibit outstanding resistance to high-temperature oxidation and hot corrosion, along with excellent fatigue performance, fracture toughness, and other comprehensive properties. As a result, they are widely used in demanding applications such as turbine disks, blades, and combustion chambers in energy and power systems. In the aerospace sector, they are critical for thermal protection systems, propulsion systems, and other components requiring reliability under extreme conditions. Furthermore, these high-performance superalloys find extensive applications in gas turbines, the energy and chemical industries, nuclear power, and other critical fields.

For this Special Issue, we welcome contributions spanning from material design and processing to applications, as well as studies related to the characterization, evaluation, prediction, and evolution of mechanical properties. We particularly encourage research papers addressing strengthening and toughening mechanisms, fatigue, creep, high-temperature oxidation, and corrosion behavior, which are essential for enhancing the final quality of superalloy components.

Prof. Dr. Yutian Ding
Dr. Yubi Gao
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-anonymized peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Ni-based superalloys
  • material design
  • microstructure
  • mechanical properties
  • fatigue
  • creep
  • high-temperature oxidation
  • high-temperature corrosion
  • strength and toughness

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Published Papers (3 papers)

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11 pages, 2171 KB  
Article
As-Built Microsegregation and JMatPro Analysis in Laser Powder Bed-Fused Inconel 718
by Li Zheng, Qirong Wang, Zhenghong Zhu, Xuexia Li, Hongfei Zhang, Jiale Zhao and Bo Liu
Metals 2026, 16(9), 960; https://doi.org/10.3390/met16090960 - 1 Sep 2026
Viewed by 202
Abstract
Laser powder bed fusion enables the fabrication of complex Inconel 718 components, but rapid solidification produces pronounced microsegregation that complicates subsequent phase evolution. In this study, scanning electron microscopy, transmission electron microscopy, and energy dispersive spectroscopy were combined with JMatPro calculations to examine [...] Read more.
Laser powder bed fusion enables the fabrication of complex Inconel 718 components, but rapid solidification produces pronounced microsegregation that complicates subsequent phase evolution. In this study, scanning electron microscopy, transmission electron microscopy, and energy dispersive spectroscopy were combined with JMatPro calculations to examine as-built microsegregation and phase behavior in laser powder bed-fused Inconel 718. The as-built alloy exhibited a continuous cellular and dendritic substructure, a high dislocation density, and interdendritic constituents with pronounced Nb enrichment and weaker local Mo enrichment. Equilibrium calculations based on the measured powder composition predicted γ formation at approximately 1350 °C and a liquid plus γ region between 1195 and 1350 °C. The calculated stability ranges of MC, δ, η, γ′, σ, M23C6, Laves, and μ phases were also identified. Comparison with the experimental observations showed that calculations using the nominal composition cannot directly represent the strongly segregated interdendritic regions formed during rapid solidification. The TTT and CCT calculations indicated that δ phase precipitation is most sensitive at approximately 900 to 1000 °C. The results clarify the distinction between local nonequilibrium phase formation and bulk phase stability and highlight the role of Nb redistribution among interdendritic constituents, the δ phase, and γ″ and γ′ precipitates. The calculated results should be regarded as a qualitative reference. Further local composition-based calculations and experimental validation are required before they can be applied to heat treatment design. Full article
(This article belongs to the Special Issue Advances in Microstructure and Mechanical Properties of Ni-Based Superalloys)
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16 pages, 3927 KB  
Article
Corrosion and Mechanical Properties of Inconel 625 Alloy with Gradient Twin Structure Regulated via Interface Engineering
by Yuanjun Ma, Zhou Chen, Yubi Gao and Xueping Song
Metals 2026, 16(8), 843; https://doi.org/10.3390/met16080843 - 3 Aug 2026
Viewed by 301
Abstract
In this paper, solution-treated Inconel 625 alloy was selected as the research object. Combined with the low-energy characteristic of annealing twin boundaries and the synergistic strengthening effect of gradient structures, the alloy microstructure was tailored without altering its chemical composition. The evolution mechanism [...] Read more.
In this paper, solution-treated Inconel 625 alloy was selected as the research object. Combined with the low-energy characteristic of annealing twin boundaries and the synergistic strengthening effect of gradient structures, the alloy microstructure was tailored without altering its chemical composition. The evolution mechanism of grain size and twin boundary fraction, as well as their influence on corrosion resistance, were investigated. On this basis, the synergistic strengthening effect of gradient structure and interface regulation on the corrosion and mechanical performance of the alloy was further explored. The results show that a gradient-structured Inconel 625 alloy with abundant annealing twins and high-density grain boundaries can be fabricated by surface nanocrystallization combined with high-temperature short-time annealing. The variation in annealing twin fraction with grain size in interface-modified Inconel 625 complies with the Pande model. In terms of corrosion resistance, the microstructure consisting of fine grains and a high fraction of annealing twins exhibits superior performance compared to coarse grains with identical twin content. Its corrosion potential is tripled, while the corrosion current density is reduced by 11 times, delivering outstanding anti-corrosion capability in NaCl solution. Benefiting from the integrated merits of gradient architecture, annealing twins and fine grains, the interface-tailored Inconel 625 alloy achieves excellent comprehensive performance, with a yield strength of 925 MPa, elongation of 26%, and corrosion current density of 3.02 × 10−8 A/cm2, realizing the integration of high strength, good ductility and superior corrosion resistance for Inconel 625 alloy. Full article
(This article belongs to the Special Issue Advances in Microstructure and Mechanical Properties of Ni-Based Superalloys)
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12 pages, 4829 KB  
Article
Improving Printability and Strength–Ductility Synergy in Additively Manufactured IN738 Alloy via Co Addition
by Sujun Lu, Yubi Gao, Huanhuan Wang, Jiayu Xu, Junling Duan and Yutian Ding
Metals 2026, 16(1), 27; https://doi.org/10.3390/met16010027 - 26 Dec 2025
Viewed by 918
Abstract
An IN738 alloy with a high Al and Ti contents induces a significant cracking tendency during laser powder bed fusion (LPBF) processing, leading to a mismatch between printability and mechanical properties. Modification of alloy compositions is an effective strategy to enhance the printability [...] Read more.
An IN738 alloy with a high Al and Ti contents induces a significant cracking tendency during laser powder bed fusion (LPBF) processing, leading to a mismatch between printability and mechanical properties. Modification of alloy compositions is an effective strategy to enhance the printability and mechanical properties of nickel-based superalloys via LPBF. In this study, the effects of adding 5 wt.%Co on the printability and mechanical properties of LPBF-fabricated IN738 were investigated by using three-dimensional high-resolution micro-computed tomography (micro-CT), electron backscatter diffraction (EBSD), and quasi-static room-temperature tensile tests. The results show that adding 5 wt.%Co can significantly reduce the defect rate and defect size of the LPBF-fabricated IN738 alloy, remarkably improve alloy densification, and optimize printability. Meanwhile, compared with the LPBF-fabricated IN738 alloy, the 5 wt.%Co-IN738 alloy exhibits an excellent balance of strength and ductility in horizontal and vertical directions, both LPBF-fabricated and heat-treated. These results are anticipated to offer valuable guidance for the development of LPBF-fabricated Ni-based superalloys that achieve a favorable balance between printability and mechanical properties. Full article
(This article belongs to the Special Issue Advances in Microstructure and Mechanical Properties of Ni-Based Superalloys)
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