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Crystals
Special Issues
Processing-Microstructure-Properties Relationship of Advanced Alloys
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Processing-Microstructure-Properties Relationship of Advanced Alloys

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: closed (29 February 2024) | Viewed by 2772

Special Issue Editors

Dr. Muhammad Naeem

E-Mail Website
Guest Editor
Department of Physics, City University of Hong Kong, Kowloon, Hong Kong
Interests: high-entropy alloys; additive manufacturing; deformation behavior; phase transformation; neutron/synchrotron diffraction
Dr. Liliana Romero-Resendiz

E-Mail Website
Guest Editor
Departamento de Ingeniería Metalúrgica, Facultad de Química, Universidad Nacional Autónoma de México, Mexico City, Mexico
Interests: heterostructured materials; strengthening mechanisms; biomaterials; nanomaterials; severe plastic deformation; texture; metallurgy
Special Issues, Collections and Topics in MDPI journals
Dr. Yi Huang

E-Mail Website
Guest Editor
Department of Design and Engineering, Bournemouth University, Poole BH12 5BB, UK
Interests: severe plastic deformation; superplasticity; ultrafine-grained materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The processing-microstructure-properties relationship of alloys defines their feasibility and applicability. Understanding the fundamentals of these relationships allows for the predictability of materials performance and a more efficient design for integrated structures. Moreover, the underlying physics of strengthening and deformation mechanisms of advanced metallic materials allow many functional properties, such as electrical conductivity, magnetic property, corrosion resistance, etc., to be realized for various applications.

Manuscripts on the topic of structural metallic materials will be accepted, but we encourage the scientific community to submit multidisciplinary metals and alloys, e.g., biomedical metallic implants, bio-safe or antimicrobial alloys, alloys for energy conversion, etc., that combine improved mechanical behavior with a deeper understanding of the processing-microstructure-properties relationship.

The aim of this Special Issue “Processing-Microstructure-Properties Relationship of Advanced Alloys” of Crystals is to present recent findings on the following topics:

  • Advanced alloys (high-entropy alloys, advanced high-strength steels, heterostructured materials, etc.);
  • Novel or extreme processing (additive manufacturing, severe plastic deformation, etc.);
  • Cutting-edge characterization techniques (in situ neutron/synchrotron diffraction, testing under extreme environments, shock-loading, etc.);
  • Multidisciplinary alloys with improved mechanical properties;
  • Strengthening and deformation mechanisms of advanced alloys;
  • Simulations for processing-microstructure-properties relationship of alloys along with the experimental evidence.

Submissions of full papers, review articles, and communications are welcome.

Dr. Muhammad Naeem
Dr. Liliana Romero-Resendiz
Dr. Yi Huang
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 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. Crystals 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

  • advanced alloys
  • microstructure
  • mechanical behavior
  • strengthening mechanisms
  • additive manufacturing
  • multidisciplinary materials
  • severe plastic deformation
  • in situ testing
  • extreme environments
  • simulations

Published Papers (3 papers)

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Research

20 pages, 12081 KiB  
Article
Crystal Plasticity Modeling to Capture Microstructural Variations in Cold-Sprayed Materials
by Aulora Williams, YubRaj Paudel, Shiraz Mujahid, Marc Pepi, Peter Czech, Haitham El Kadiri and Hongjoo Rhee
Crystals 2024, 14(4), 329; https://doi.org/10.3390/cryst14040329 - 30 Mar 2024
Viewed by 493
Abstract
The high-velocity impact of powder particles in cold-spray additively manufactured (CSAM) parts creates intersplat boundaries with regions of high dislocation densities and sub-grain structures. Upon microstructure and mechanical characterization, CSAM Aluminum 6061 showed non-uniformity with spatial variation in the microstructure and mechanical properties, [...] Read more.
The high-velocity impact of powder particles in cold-spray additively manufactured (CSAM) parts creates intersplat boundaries with regions of high dislocation densities and sub-grain structures. Upon microstructure and mechanical characterization, CSAM Aluminum 6061 showed non-uniformity with spatial variation in the microstructure and mechanical properties, affecting the overall response of the additively manufactured parts. Post-processing treatments are conducted in as-printed samples to improve particle bonding, relieve residual stresses, and improve mechanical properties. In this work, we attempt to implement the effects of grain size and distribution of smaller grains along the intersplat boundaries using the grain size distribution function and powder size information to accurately predict the deformation response of cold-sprayed material using a mean-field viscoplastic self-consistent (VPSC) model. The incorporation of an intersplat boundary term in the VPSC model resulted in a stress–strain response closely matching the experimental findings, preventing the superficially high stresses observed due to Hall–Petch effects from ultra-fine-grain structures. Likewise, the results from the grain analysis showed the combined effects of grain size, orientation, and intersplat mechanisms that captured the stresses experienced and strain accommodated by individual grains. Full article
(This article belongs to the Special Issue Processing-Microstructure-Properties Relationship of Advanced Alloys)
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13 pages, 6593 KiB  
Article
Numerical/Experimental Study of Process Optimization Conducted on an Al-Cu Alloy Produced by Combined Fields of Applied Pressure and Ultrasonic Vibration
by Jinxue Wang, Khashayar Khanlari, Yali Chen, Bo Lin, Yang Zhang and Weiwen Zhang
Crystals 2023, 13(10), 1466; https://doi.org/10.3390/cryst13101466 - 07 Oct 2023
Viewed by 824
Abstract
Single-pressure and ultrasonic action have their own unique advantages in the treatment of metal melts. When the two are combined into a composite field, the advantages of a single physical field can be fully utilized. So, the cavitation and acoustic streaming effects characteristics [...] Read more.
Single-pressure and ultrasonic action have their own unique advantages in the treatment of metal melts. When the two are combined into a composite field, the advantages of a single physical field can be fully utilized. So, the cavitation and acoustic streaming effects characteristics of an Al-5.0Cu alloy treated under different coupling process parameters, related to applied extrusion pressure and ultrasonic vibration, were analyzed by combining numerical simulation and experimental verification. The simulation results were experimentally verified by quantitative analysis of the microstructure, the melt, and its macro characteristics. The results show that the closing time t decreases with an increase in the extrusion pressure. In addition, when the ultrasonic power and extrusion force are increased simultaneously (100 MPa and 1 kW), the average grain size and the proportion of columnar grains reach the ideal effect. The influence of pressure parameters is greater, which will also lead to an increase in the proportion of columnar crystals. By optimizing the parameters, the grain size can be further reduced, the proportion of columnar crystal structure can be reduced, and fine and uniform equiaxed crystal structures can be easily obtained. Full article
(This article belongs to the Special Issue Processing-Microstructure-Properties Relationship of Advanced Alloys)
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12 pages, 3054 KiB  
Article
Analysis of the Effect of Simultaneous Melt Shearing and Cooling on Grain Formation and Rheology of A356 Aluminum Alloy
by Mahmoud Ahmadein, Naser A. Alsaleh, Mahmoud Ahmed Elsayed and Sabbah Ataya
Crystals 2023, 13(9), 1345; https://doi.org/10.3390/cryst13091345 - 04 Sep 2023
Cited by 1 | Viewed by 644
Abstract
Despite the dozens of earlier research verifications, the contribution of shearing of molten metallic alloys during their solidification to grain formation is still ambiguous. Also, modeling of this phenomenon has received very little attention. Experiments were conducted in this study to investigate the [...] Read more.
Despite the dozens of earlier research verifications, the contribution of shearing of molten metallic alloys during their solidification to grain formation is still ambiguous. Also, modeling of this phenomenon has received very little attention. Experiments were conducted in this study to investigate the effect of the shear rate on the density, size, and shape factor of the formed grains up to a solid fraction of 0.15 for the solidifying A356 aluminum alloy in the coaxial cylinder viscometer. The rheology of the formed semisolid slurry was studied as well. Results exhibited morphological evolution and grain refinement. The grain number density increased from 5 × 108 m−3 in the absence of melt shearing to reach 4 × 109 m−3 at the shear rate of 250 s−1. Also, the shape factor was improved to reach 0.78. Based on the experimental investigations, the grain number density under shearing was correlated to the shear rate and the grain number density in the absence of shearing via an empirical formula. A shear-dependent grain multiplication factor was deduced. The alloy exhibited a shear-thinning behavior where the viscosity obeyed the power law with a constant and an exponent of 0.9264 and 0.468, respectively. Moreover, the measured data were fitted to several proposed viscosity models and the model of Hirai et al. showed the best fit; therefore, it was recommended for predicting the viscosity of semisolid slurries. Full article
(This article belongs to the Special Issue Processing-Microstructure-Properties Relationship of Advanced Alloys)
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