Alloy Design and Its Performance Trade-Offs

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

Deadline for manuscript submissions: 31 July 2025 | Viewed by 2006

Special Issue Editor


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Guest Editor
Brunel Centre for Advanced Solidification Technology (BCAST), Brunel University London, Uxbridge UB8 3PH, UK
Interests: alloy design and development; thermomechanical processing; casting; quasicrystals

Special Issue Information

Dear Colleagues,

Alloy design can be a crucial step in developing advanced metallic materials, directly affecting their performance and application. Balancing properties such as strength, ductility, formability, and conductivity is essential for creating high-performance alloying systems. Modern metallurgy focuses on enhancing these properties simultaneously through innovative manufacturing processes and thermomechanical treatments. Understanding the relationships between alloy chemistry, microstructural features, and processing parameters is key to achieving optimal performance. Recent research in this field has allowed for significant advancements, particularly in nanostructured metallic materials and advanced thermomechanical processing techniques. These developments have important implications for alloy design and optimization, offering improved performance across various applications.

This Special Issue aims to present the latest research on alloy design and performance trade-offs. Topics of interest include novel alloy systems, the effects of processing techniques on properties, the role of microstructure in performance, and strategies for balancing conflicting properties through experimental and computational platforms. Specific areas of focus are high-entropy and nanostructured alloys, thermomechanical processing, grain refinement, solid solution strengthening, precipitation hardening, and computational methods for the design and optimization of new alloys. We welcome manuscript submissions to this Special Issue that cover these topics.

Dr. Seyedmehdi Hosseini
Guest Editor

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Keywords

  • alloy design
  • performance trade-offs
  • manufacturing process
  • thermomechanical treatment
  • alloy chemistry
  • microstructural features
  • solid solution strengthening
  • precipitation hardening
  • computational methods

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Published Papers (2 papers)

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Research

15 pages, 3880 KiB  
Article
Trade-Off Between Wear/Corrosion Performance and Mechanical Properties in D-AlNiCo Poly-Quasicrystals Through CNT Addition to the Microstructure
by Seyedmehdi Hosseini, Pavel Novák, Mostafa Alishahi, Zdeněk Kačenka and Petr Šittner
Metals 2024, 14(11), 1269; https://doi.org/10.3390/met14111269 - 8 Nov 2024
Viewed by 598
Abstract
An ultrafine-grained Al71Ni14.5Co14.5/CNT poly-quasicrystal (QC/CNT) composite was synthesized using spark plasma sintering of powder components developed through electroless Ni-P/CNT plating of Co particles and mechanical alloying. The performance of the synthesized samples was studied using various testing [...] Read more.
An ultrafine-grained Al71Ni14.5Co14.5/CNT poly-quasicrystal (QC/CNT) composite was synthesized using spark plasma sintering of powder components developed through electroless Ni-P/CNT plating of Co particles and mechanical alloying. The performance of the synthesized samples was studied using various testing methods, such as room temperature/hot compression, wear, and corrosion tests. The results were compared to the properties of alloy samples fabricated from raw and coated powders (without CNTs). The wear rate and friction coefficient of the quasicrystalline samples improved significantly due to the contribution of the CNTs. The wear rate of the CNT-containing specimens was 0.992 × 10−4 mm3/N/m, which is 47.1% lower than that of the QC sample. The positive impact of the CNTs on the corrosion potential and current density was further validated by the potentiodynamic polarization tests in a saline solution. However, these improvements in surface properties came at the cost of a 21.5% reduction in compressive strength, although the compressive strength still remained above 1.1 GPa at 600 °C. The results highlight an interesting trade-off between surface properties and mechanical strength, pointing toward the development of materials suitable for extreme conditions. Full article
(This article belongs to the Special Issue Alloy Design and Its Performance Trade-Offs)
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19 pages, 11907 KiB  
Article
Examination of Novel Titanium-639 Alloy as a Means of Balancing Strength and Ductility through Molybdenum Addition Rather than Prolonged Aging Heat Treatment
by Shiraz Mujahid, Alireza Fadavi Boostani, YubRaj Paudel, Andrew Oppedal, Bhasker Paliwal, Hongjoo Rhee and Haitham El Kadiri
Metals 2024, 14(7), 828; https://doi.org/10.3390/met14070828 - 18 Jul 2024
Viewed by 1052
Abstract
Manufacturing titanium alloys with simultaneous enhancement in strength and ductility has motivated extensive research into various strategies for regulating the arrangement and texture of α and β phases. The present study explores a novel α + β titanium alloy, TIMETAL 639 (Ti-639), produced [...] Read more.
Manufacturing titanium alloys with simultaneous enhancement in strength and ductility has motivated extensive research into various strategies for regulating the arrangement and texture of α and β phases. The present study explores a novel α + β titanium alloy, TIMETAL 639 (Ti-639), produced by replacing a portion of vanadium in Ti-64 with molybdenum. The low diffusivity and β-stabilizing effects of molybdenum help retain bimodal characteristics within solution heat-treated Ti-639 microstructures. EBSD and TEM were used to examine β-phase evolution after thermal processing and recrystallization of new globular α grains within pre-existing colonies in a depleted bimodal microstructure. These depleted bimodal colonies in solution heat-treated Ti-639 also led to lower misorientation spreads and dislocation densities within neighboring primary α grains. Quasi-static compression along the plate normal direction demonstrated the ability of the depleted bimodal microstructure to simultaneously enhance strength and ductility in Ti-639 (~90 MPa stronger, ~6% higher failure strain) versus identically processed Ti-64. Only one solution heat-treatment step (1 h at 900 °C) is needed to achieve these properties in Ti-639, whereas comparable properties in Ti-64 required prolonged aging heat treatment (24 h at 600 °C) after the same solution heat-treatment step, making Ti-639 a viable α + β alloy candidate. Full article
(This article belongs to the Special Issue Alloy Design and Its Performance Trade-Offs)
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