Development, Deformation, Fracture and Phase Transformation of New Generation Metallic Structural Materials

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

Deadline for manuscript submissions: closed (31 August 2023) | Viewed by 4626

Special Issue Editor


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Guest Editor
School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, China
Interests: high strength steels; mechanical properties; fracture toughness; phase transformation

Special Issue Information

Dear Colleagues,

Metallic materials are a major workhorse of modern society due to their excellent performance cost synergy. Modern technologies and industries not only significantly depend on current metallic materials, but raise higher demands for high-performance structural materials to withstand more arduous operating conditions and aggressive environments. The mechanical properties of metallic materials to a large extent depends on the microstructure features, which can be optimized by chemical composition and development process. Therefore, studies on the process microstructure properties relationship are of great significance for both the fundamental understanding of the deformation mechanisms as well as the industrial application of metallic materials.

The aim of the Special Issue is to deliver the latest achievements in theoretical and experimental investigations of alloying and processing design, phase transformation behavior, and the deformation and fracture mechanisms of new generation metallic materials. Investigations about the mechanical behaviors of various metallic materials under special environments are also welcome.

Prof. Dr. Li Liu
Guest Editor

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Keywords

  • high strength steels
  • mechanical properties
  • fracture toughness
  • phase transformation

Published Papers (4 papers)

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Research

12 pages, 13652 KiB  
Article
Fracture of Fe95Ni5 Alloys with Gradient-Grained Structure under Uniaxial Tension
by Aleksandr Korchuganov, Dmitrij Kryzhevich and Konstantin Zolnikov
Metals 2023, 13(7), 1308; https://doi.org/10.3390/met13071308 - 21 Jul 2023
Viewed by 781
Abstract
The fracture behavior of single- (fcc) and two-phase (fcc + bcc) Fe95Ni5 samples with gradient-grained structure, under uniaxial tension, was analyzed via molecular dynamics simulation. The study revealed that fracture initiation and propagation is always associated with grain boundaries. The [...] Read more.
The fracture behavior of single- (fcc) and two-phase (fcc + bcc) Fe95Ni5 samples with gradient-grained structure, under uniaxial tension, was analyzed via molecular dynamics simulation. The study revealed that fracture initiation and propagation is always associated with grain boundaries. The fracture process develops in three stages. In the first stage, nanopores are formed in the boundaries of coarse grains. The total volume of nanopores at this stage increases slowly due to the formation of new nanopores. The second stage is characterized by a rapid increase in the total nanopore volume due to the formation of nanopores, their growth along the grain boundaries, and their coalescence. At the third stage, the total nanopore volume increases linearly with deformation due to the growth of the largest nanopores. Fracture of two-phase samples begins at higher strains compared to a single-phase sample. With an increase in the volume fraction of bcc lamellae in the original sample, the number of nanopores at the third stage of fracture decreases and tends to one. Full article
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10 pages, 11808 KiB  
Article
Investigation on Anisotropic Mechanical Behavior of Ti-6Al-4V Alloy via Schmid Factor and Kernel Average Misorientation Distribution
by Jinkui Meng, Xiangguang Chen, Jiantang Jiang and Li Liu
Metals 2023, 13(1), 89; https://doi.org/10.3390/met13010089 - 31 Dec 2022
Cited by 7 | Viewed by 1472
Abstract
Anisotropic mechanical behavior of the Ti-6Al-4V alloy is essential for its forming and service. Generally, it is preferable to minimize the in-plane anisotropy of Ti-6Al-4V sheet. The present work investigates the anisotropy of Ti-6Al-4V alloy by tensile tests along the rolling direction (RD), [...] Read more.
Anisotropic mechanical behavior of the Ti-6Al-4V alloy is essential for its forming and service. Generally, it is preferable to minimize the in-plane anisotropy of Ti-6Al-4V sheet. The present work investigates the anisotropy of Ti-6Al-4V alloy by tensile tests along the rolling direction (RD), transverse direction (TD), and diagonal direction (DD) of the sheet, evaluating the anisotropic yield and flow behaviors and exploring the causes of these anisotropic properties. The intrinsic deformation mechanism of Ti-6Al-4V alloy tensioned along different directions was studied with Schmid factor and kernel average misorientation (KAM) analysis. The samples tensioned along the RD and TD of the sheet (denoted as RD sample and TD sample) show similar yield stress, while tensile along the DD (denoted as DD sample) leads to lower yield strength. The mechanical anisotropy exhibited by the Ti-6Al-4V sheet is closely related to the crystallographic texture. The flow stresses of the RD and TD samples are higher than that of the DD sample due to the higher density of dislocations generated during the tensile deformation, in which prismatic a dislocations make a great contribution to coordinating plastic deformation. Full article
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13 pages, 7235 KiB  
Article
Influence of the Gas Reaction Atmosphere on the Structure, Phase Composition, Functional Properties and Cytocompatibility of Porous Titanium–Nickel Alloys
by Ekaterina Marchenko, Gulsharat Baigonakova and Arina Shishelova
Metals 2022, 12(12), 2170; https://doi.org/10.3390/met12122170 - 16 Dec 2022
Cited by 2 | Viewed by 978
Abstract
This work studies the effect that argon and nitrogen atmospheres have on the structure, phase composition, cytocompatibility, and functional properties of porous NiTi alloys obtained by self-propagating high-temperature synthesis. Porous alloys obtained in the nitrogen atmosphere (NiTi-(N)) are characterized by brittle interstitial phases [...] Read more.
This work studies the effect that argon and nitrogen atmospheres have on the structure, phase composition, cytocompatibility, and functional properties of porous NiTi alloys obtained by self-propagating high-temperature synthesis. Porous alloys obtained in the nitrogen atmosphere (NiTi-(N)) are characterized by brittle interstitial phases Ti4Ni2O(N) and the appearance of a finely dispersed TiNi3 phase in comparison with the alloy obtained in an argon atmosphere (NiTi-(Ar)). An increase in the volume fraction of the Ti4Ni2O(N) phase as well as an increase in the content of nitrogen in the surface layer of the NiTi-(N) alloy favorably affects the surface cytocompatibility with bone marrow mesenchymal stem cells. It was found that the mechanisms of martensitic transformations in porous NiTi alloys under load and without load are different. It has been established that the mechanical characteristics of NiTi-(N) alloys are noticeably lower than those of NiTi-(Ar) alloys. Thus, according to the data obtained, porous NiTi-(N) alloys can be considered more biocompatible under low physiological load. However, it is necessary to increase their reversible deformation and tensile strength in order to use porous NiTi-(N) alloys under high physiological load. Full article
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12 pages, 4165 KiB  
Article
Effect of Notch Structure and Notch Bottom Diameter on the Tensile Load of a Certain GH4169 Notch Bolt for a Device for Longitudinal Separation of Fairing
by Xiaoliang Wang, Yunxian Cui, Tiebing Yuan, Xiaowei Wang and Zenghui Jiang
Metals 2022, 12(12), 2127; https://doi.org/10.3390/met12122127 - 11 Dec 2022
Viewed by 944
Abstract
The effect of the notch structure and bottom diameter of a GH4169 notch bolt for an explosive separation device used for longitudinal separation of the fairing, and GH4169 strength range on the tensile load was studied by combing simulations with tests. The results [...] Read more.
The effect of the notch structure and bottom diameter of a GH4169 notch bolt for an explosive separation device used for longitudinal separation of the fairing, and GH4169 strength range on the tensile load was studied by combing simulations with tests. The results show that the V-shaped, arc-shaped and square notch structures can improve the tensile load of the bolt but to a lesser degree in sequence, and the arc-shaped notch structure performs best in terms of tensile load, fracture appearance and shear resistance. In order to meet the design requirements of 14–15.5 KN tensile load for the notch bolt with an arc-shaped structure, four raw material tensile intervals corresponding to the notch bottom diameters were established by using domestic GH4169 grade C cold-drawn bars. Full article
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