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Metals
Special Issues
Phase Transformations in Alloy Processing
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Phase Transformations in Alloy Processing

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (31 March 2018) | Viewed by 11155

Special Issue Editor

Prof. Dr. Ralph E. Napolitano

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, Iowa State University, 528 Bissell Road, Ames, IA 50011-1096, USA
Interests: alloy solidification; alloy thermodynamics; metallic glass; diffusional phase transformations; additive manufacturing; computational modeling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The variety of methods available for manufacturing metallic products affords great flexibility for the integrated design of alloys, processes, and components. Central to any design strategy is the effective control of microstructure and properties through processing conditions. Such control requires fundamental understanding of the mechanisms of phase transformations, quantitative knowledge regarding the influence of the prevailing process conditions, appropriate means to monitor and control these conditions, and predictive capabilities to guide the integrated design. This Special Issue is devoted to research activities aimed at innovation in these areas, facilitating realization of new or enhanced functionality through the control of alloy phase transformations. All areas of alloy processing will be considered, including solidification processing, thermo-mechanical processing, powder processing, surface processing, additive processing and others. Manuscripts conveying original research and/or critical reviews in areas relevant to these topics will be considered for publication.

Prof. Ralph E. Napolitano
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 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 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. 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

  • Mechanisms of phase transformations

  • Causes and effects of defect structures

  • In situ measurements and monitoring of processes and microstructures

  • Integrated process/alloy/component design

  • Innovative alloy processing or process monitoring/control

  • Modeling of process conditions and phase transformations

Published Papers (3 papers)

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Research

10 pages, 3086 KiB  
Article
The Difference of Lamellar Structure Formation between Ti-45Al-5.4V-3.6Nb-Y Alloy and Ti-44Al-4Nb-4V-0.3Mo-Y Alloy
by Jianchao Han, Shuzhi Zhang, Changjiang Zhang, Fantao Kong, Yuyong Chen and Fei Yang
Metals 2018, 8(8), 566; https://doi.org/10.3390/met8080566 - 24 Jul 2018
Viewed by 2629
Abstract
In this study, the effect factors on the formation of lamellar structure for Ti-45Al-5.4V-3.6Nb-Y alloy and Ti-44Al-4Nb-4V-0.3Mo-Y alloy is discussed in detail. During heat treatment in different procedures, temperature was the common factor influencing the formation of lamellar structures of Ti-45Al-5.4V-3.6Nb-Y and Ti-44Al-4Nb-4V-0.3Mo-Y [...] Read more.
In this study, the effect factors on the formation of lamellar structure for Ti-45Al-5.4V-3.6Nb-Y alloy and Ti-44Al-4Nb-4V-0.3Mo-Y alloy is discussed in detail. During heat treatment in different procedures, temperature was the common factor influencing the formation of lamellar structures of Ti-45Al-5.4V-3.6Nb-Y and Ti-44Al-4Nb-4V-0.3Mo-Y alloys. In the range of 1230 °C and 1300 °C, the volume fraction of lamellar structure in Ti-45Al-5.4V-3.6Nb-Y alloy was proportional to the annealing temperature. However, between 1210 °C and 1260 °C, the volume fraction of lamellar structure in Ti-44Al-4Nb-4V-0.3Mo-Y alloy deceased when temperature was located in the α + γ + β triple phase field and then increased when temperature was in the α + β binary phase field. Besides the influence of temperature, the lamellar structure formation of Ti-44Al-4Nb-4V-0.3Mo-Y alloy was also affected by the β-phase stabilizing element. Full article
(This article belongs to the Special Issue Phase Transformations in Alloy Processing)
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14 pages, 4963 KiB  
Article
Numerically Based Phase Transformation Maps for Dissimilar Aluminum Alloys Joined by Friction Stir-Welding
by Carter Hamilton, Stanisław Dymek, Mateusz Kopyściański, Aleksandra Węglowska and Adam Pietras
Metals 2018, 8(5), 324; https://doi.org/10.3390/met8050324 - 08 May 2018
Cited by 13 | Viewed by 3557
Abstract
Sheets of aluminum 2017A-T451 and 7075-T651 were friction stir-welded in a butt-weld configuration. An existing computational model of the welding process for temperature distribution and material flow was adapted to estimate the phase transformations that occur across the weld zone. Near the weld [...] Read more.
Sheets of aluminum 2017A-T451 and 7075-T651 were friction stir-welded in a butt-weld configuration. An existing computational model of the welding process for temperature distribution and material flow was adapted to estimate the phase transformations that occur across the weld zone. Near the weld center, process temperatures are sufficient to fully dissolve the equilibrium η phase in 7075 and partially dissolve the equilibrium S phase in 2017A. Upon cooling, Guinier–Preston (GP) and Guinier–Preston–Bagaryatsky (GPB) zones re-precipitate, and hardness recovers. Due to the more complete dissolution of the equilibrium phase in 7075, the hardness recovery skews toward whichever side of the weld, i.e., the advancing or retreating side, represents the 7075 workpiece. Phase transformation maps generated by the numerical simulation align not only with the hardness profiles taken across the weld zone, but also with positron lifetimes obtained through positron annihilation lifetime spectroscopy (PALS). Boundaries between the aluminum matrix and the secondary phases provide open volumes to trap positrons; therefore, positron lifetimes across the weld correspond with the phase transformations that occur in 7075 and 2017A during processing. Full article
(This article belongs to the Special Issue Phase Transformations in Alloy Processing)
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6915 KiB  
Article
Phase Transition of Peritectic Steel Q345 and Its Effect on the Equilibrium Partition Coefficients of Solutes
by Huabiao Chen, Mujun Long, Junsheng Cao, Dengfu Chen, Tao Liu and Zhihua Dong
Metals 2017, 7(8), 288; https://doi.org/10.3390/met7080288 - 28 Jul 2017
Cited by 15 | Viewed by 4562
Abstract
The solidification path of peritectic steel Q345 was calculated and compared with in-situ observations to investigate the effect of phase transition on the equilibrium partition coefficient. Subsequently, a thermodynamic model for calculating the equilibrium partition coefficient was established and thermodynamic calculations were performed [...] Read more.
The solidification path of peritectic steel Q345 was calculated and compared with in-situ observations to investigate the effect of phase transition on the equilibrium partition coefficient. Subsequently, a thermodynamic model for calculating the equilibrium partition coefficient was established and thermodynamic calculations were performed under different phase configurations. Results indicate that L (liquid phase) + δ, L + δ + γ, and L + δ phases coexist in sequence during the solidification of peritectic steel Q345. The phase constitution of the mushy zone evidently affects the evolution of the equilibrium partition coefficient of solutes. The temperature dependence of the equilibrium partition coefficient was quantified through the regression analyses of C, Si, Mn, P, and S solutes under different phase configurations. The average equilibrium partition coefficients of Mn, Si, P, C, and S are 0.696, 0.615, 0.273, 0.2, and 0.033, respectively, thereby indicating the strongest segregation tendency for S and the weakest for Mn. Full article
(This article belongs to the Special Issue Phase Transformations in Alloy Processing)
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