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Alloys, Volume 4, Issue 1 (March 2025) – 4 articles

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12 pages, 22226 KiB  
Article
Research on the Microstructure Evolution of TC4 Titanium Alloy Joint Fabricated by Continuous Drive Friction Welding
by Shanshan Cui, Shiqing Wang, Yiqiang Zhang, Guodong Wen and Wei Qiang
Alloys 2025, 4(1), 4; https://doi.org/10.3390/alloys4010004 - 14 Mar 2025
Viewed by 392
Abstract
In this paper, TC4 titanium alloy pipes were achieved by continuous drive friction welding, metallographic microscope and microhardness tester were used to evaluate the microstructure and the hardness of the joints, and the effect of friction pressure on the microstructure was studied. Under [...] Read more.
In this paper, TC4 titanium alloy pipes were achieved by continuous drive friction welding, metallographic microscope and microhardness tester were used to evaluate the microstructure and the hardness of the joints, and the effect of friction pressure on the microstructure was studied. Under the selected welding parameters, all the joints have good morphology. The martensite is formed at the weld zone and the flash, which leads to a higher hardness on the weld zone. With the increase of friction pressure, the width of the weld zone, the grain size and LAGB (low angle grain boundary) at the weld zone decreases. In addition, dynamic recrystallization increases first, but when the friction pressure reaches 65 MPa, the deformation dominates. Full article
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9 pages, 2363 KiB  
Article
Lattice Dynamics and Thermal Properties of TixZr1-xNiSn Half-Heusler Alloys
by Prince Sharma
Alloys 2025, 4(1), 3; https://doi.org/10.3390/alloys4010003 - 26 Feb 2025
Cited by 1 | Viewed by 438
Abstract
Half-Heusler alloys are promising materials for thermoelectric applications, yet the impact of the compositional disorder on their lattice dynamics remains incompletely understood. This study investigates the effect of systematic Zr substitution on the lattice dynamics and thermal properties of TixZr1-x [...] Read more.
Half-Heusler alloys are promising materials for thermoelectric applications, yet the impact of the compositional disorder on their lattice dynamics remains incompletely understood. This study investigates the effect of systematic Zr substitution on the lattice dynamics and thermal properties of TixZr1-xNiSn half-Heusler alloys using first-principles calculations. Through careful analysis of phonon dispersions, density of states, and thermodynamic properties, it is revealed that Zr substitution (25%, 50%, and 75%) introduces minimal structural distortion while enhancing system stability. It is shown that increasing Zr content systematically modifies the phonons, particularly affecting the high-frequency optical modes above 5 THz. Notably, with Zr content, these findings provide valuable insights for tailoring the thermal properties of half-Heusler alloys for high-temperature applications in thermoelectric devices and components. Full article
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14 pages, 2535 KiB  
Article
Oxidation Kinetics of FeCr and FeCrAl Alloys: Influence of Secondary Processes (Continuation)
by Irakli Nakhutsrishvili and Revaz Tevzadze
Alloys 2025, 4(1), 2; https://doi.org/10.3390/alloys4010002 - 27 Jan 2025
Viewed by 694
Abstract
This paper discusses the influence of the secondary processes of reaction product evaporation and the reduction of the effective diffusion area into the scale on the kinetics (change in sample mass–time) of the high-temperature oxidation processes, in air, of alumina- and chromia-forming alloys. [...] Read more.
This paper discusses the influence of the secondary processes of reaction product evaporation and the reduction of the effective diffusion area into the scale on the kinetics (change in sample mass–time) of the high-temperature oxidation processes, in air, of alumina- and chromia-forming alloys. Full article
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18 pages, 9907 KiB  
Article
Effect of Microstructure on Multiscale Mechanical Properties of Scalmalloy Produced by Powder Bed Fusion-Laser Beam
by Huixing (Hannah) Zhang, Caitlin E. R. Green, Maria J. Lodeiro, Peter Woolliams, Ken P. Mingard and Antony T. Fry
Alloys 2025, 4(1), 1; https://doi.org/10.3390/alloys4010001 - 30 Dec 2024
Viewed by 991
Abstract
For additive manufactured parts, it is important to measure homogeneity and demonstrate representative parts can be printed faster while maintaining key mechanical properties. In this work, a multiscale characterization of microstructural and mechanical properties was carried out to gain a thorough understanding of [...] Read more.
For additive manufactured parts, it is important to measure homogeneity and demonstrate representative parts can be printed faster while maintaining key mechanical properties. In this work, a multiscale characterization of microstructural and mechanical properties was carried out to gain a thorough understanding of a range of powder bed fusion-laser beam (PBF-LB)-manufactured Scalmalloy for future optimization of the processing parameters. The relationship between microstructure, including porosity, grain structure, and precipitates, and mechanical properties, is investigated. The stress-relieved samples were characterized mainly using scanning electron microscopy (SEM) suite, uniaxial tensile tests and nanoindentation. The results show the multiple strengthening mechanisms in Scalmalloy, including solid solution strengthening, grain size, precipitates and dislocations strengthening, demonstrated through a combination of the nanoindentation measurements with microstructural analysis at the local scale. The current work suggests potential mechanisms for further improvement of the strength and ductility in PBF-LB-Scalmalloy. Full article
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