Special Issue "Superalloys–Currents Trends in Development of Their Microstructure and Properties"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Manufacturing Processes and Systems".

Deadline for manuscript submissions: 31 December 2021.

Special Issue Editor

Prof. Jan Sieniawski
E-Mail Website
Guest Editor
Department of Materials Science, Rzeszow University of Technology, PL-35959 Rzeszow, Poland
Interests: aerospace materials; superalloys; heat-resisting layers; thermal barrier coating; single crystal casts

Special Issue Information

Dear Colleagues,

Superalloys are metallic alloys (nickel-, cobalt- and iron-based) capable of being used at high temperatures, often in excess of 0.7 of their absolute melting temperature. Since the 1950s, their development has led to significant increases in operating temperatures—from about 750 to 1050 ºC. This was possible by modification of their chemical compositions (e.g., addition of Rare Earth elements) and manufacturing processes (investment casting, single-crystal production). The efficiency of this approach seems to have been much lower in last two or three decades, and surface treatment methods became the primary means for increasing hot corrosion resistance of structural elements made of superalloys. Independent of surface engineering achievements, the role of substrate materials is incontestable, especially in terms of the assurance of adequate creep resistance.

The main role of alloying additions in superalloys is to develop thermally-stable microstructures containing optimal volume fractions of phase constituents, e.g., γ’ hardening precipitates in nickel-based superalloys. Another tool in the microstructure development process is heat treatment, mainly precipitation strengthening. Proper selection of conditions requires knowledge of phase transformations kinetics, which requires the application of advanced material examination methods. An important achievement in the field of superalloy casting was the application of directional solidification. It is generally accepted that single-crystal casts exhibit much better creep resistance compared with polycrystalline ones. In the case of turbine blades, it is crucial to know how to obtain the optimal crystal orientation and evaluate its performance.

The scope of this forthcoming Special Issue will focus on recent innovative and pioneering works in the field of metallurgy and processing, structure and microstructure examination, and the development of the operational properties of superalloys.

I invite our colleagues to submit a manuscript to this Special Issue, which can be in the form of a full research paper, communication, or review.

Prof. Jan Sieniawski
Guest Editor

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 papers will be 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 100 words) can be sent to the Editorial Office for announcement on this website.

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-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly 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 2000 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.


  • superalloys
  • directional solidification
  • single-crystals
  • microstructure characterization
  • creep resistance

Published Papers (13 papers)

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Open AccessArticle
Microstructural Investigations of Ni-Based Superalloys by Directional Solidification Quenching Technique
Materials 2020, 13(19), 4265; https://doi.org/10.3390/ma13194265 - 24 Sep 2020
Open AccessArticle
Characterization of γ′ Precipitates in Cast Ni-Based Superalloy and Their Behaviour at High-Homologous Temperatures Studied by TEM and in Situ XRD
Materials 2020, 13(10), 2397; https://doi.org/10.3390/ma13102397 - 22 May 2020
Open AccessArticle
Fabrication and Characterization of the Newly Developed Superalloys Based on Inconel 740
Materials 2020, 13(10), 2362; https://doi.org/10.3390/ma13102362 - 21 May 2020
Open AccessArticle
Variation of Crystal Orientation and Dendrite Array Generated in the Root of SX Turbine Blades
Materials 2019, 12(24), 4126; https://doi.org/10.3390/ma12244126 - 09 Dec 2019
Open AccessArticle
The Effect of Withdrawal Rate on Crystal Structure Perfection, Microstructure and Creep Resistance of Single Crystal Castings Made of CMSX-4 Nickel-Based Superalloy
Materials 2019, 12(20), 3422; https://doi.org/10.3390/ma12203422 - 19 Oct 2019
Open AccessArticle
Primary Crystal Orientation of the Thin-Walled Area of Single-Crystalline Turbine Blade Airfoils
Materials 2019, 12(17), 2699; https://doi.org/10.3390/ma12172699 - 23 Aug 2019
Open AccessArticle
Precipitates in Additively Manufactured Inconel 625 Superalloy
Materials 2019, 12(7), 1144; https://doi.org/10.3390/ma12071144 - 08 Apr 2019
Open AccessArticle
Application of Inner Radiation Baffles in the Bridgman Process for Flattening the Temperature Profile and Controlling the Columnar Grain Structure of Directionally Solidified Ni-Based Superalloys
Materials 2019, 12(6), 935; https://doi.org/10.3390/ma12060935 - 21 Mar 2019
Open AccessArticle
Defect Creation in the Root of Single-Crystalline Turbine Blades Made of Ni-Based Superalloy
Materials 2019, 12(6), 870; https://doi.org/10.3390/ma12060870 - 15 Mar 2019
Open AccessArticle
Grain Selection in a High-Efficiency 2D Grain Selector During Casting of Single-Crystal Superalloys
Materials 2019, 12(5), 789; https://doi.org/10.3390/ma12050789 - 07 Mar 2019
Open AccessArticle
Development of a High-Efficiency Z-Form Selector for Single Crystal Blades and Corresponding Grain Selection Mechanism
Materials 2019, 12(5), 780; https://doi.org/10.3390/ma12050780 - 07 Mar 2019
Open AccessArticle
Effects of Withdrawal Rate on the Microstructure of Directionally Solidified GH4720Li Superalloys
Materials 2019, 12(5), 771; https://doi.org/10.3390/ma12050771 - 06 Mar 2019
Open AccessArticle
Effect of Long-Term High Temperature Oxidation on the Coking Behavior of Ni-Cr Superalloys
Materials 2018, 11(10), 1899; https://doi.org/10.3390/ma11101899 - 04 Oct 2018
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