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Microstructure, Mechanical Properties, and Deformation Characteristics of Metals and Alloys—2nd...
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Microstructure, Mechanical Properties, and Deformation Characteristics of Metals and Alloys—2nd Edition

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: 20 January 2025 | Viewed by 3302

Special Issue Editor

Dr. Guobing Wei

E-Mail Website
Guest Editor
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Interests: metallic materials; composites; grain boundary; deformation behavior; twins; mechanical properties, severe plastic deformation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

As the largest group of engineering materials, metals and alloys have always played an important role in the development of the world economy. Ready availability, ease of fabrication, and desirable mechanical properties are the principal attributes of metals and alloys. Metallic materials may be divided into two large groups, ferrous and nonferrous, depending on whether iron or another element is the principal constituent. Ferrous materials can be further grouped into wrought irons, cast irons, carbon steels, and alloy steels. Common nonferrous materials include alloys of copper, aluminum, magnesium, nickel, lead, tin, and zinc.

The relationship between microstructure, mechanical properties, and deformation characteristics is critical in the research of metals and alloys. This Special Issue welcomes the submission of high-quality research on various aspects of metals and alloys, including microstructure evolution, materials design, numerical modeling, processing technology, and failure mechanisms. In particular, we encourage papers on the relationship between advanced manufacturing processing and the microstructure properties of metals and alloys.

Dr. Guobing Wei
Guest Editor

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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

  • microstructure evolution
  • mechanical and physical properties
  • strengthening mechanisms
  • numerical modeling
  • failure mechanisms

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Published Papers (4 papers)

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Research

16 pages, 18440 KiB  
Article
Microstructural Evolution and Mechanical Properties of Extruded AZ80 Magnesium Alloy during Room Temperature Multidirectional Forging Based on Twin Deformation Mode
by Rou Wang, Fafa Yan, Jiaqi Sun, Wenfang Xing and Shuchang Li
Materials 2024, 17(20), 5055; https://doi.org/10.3390/ma17205055 - 16 Oct 2024
Viewed by 582
Abstract
This study investigates the preparation of ultrahigh-strength AZ80 magnesium alloy bulks using room temperature multidirectional forging (MDF) at different strain rates. The focus is on elucidating the effects of multidirectional loading and strain rates on grain refinement and the subsequent impact on the [...] Read more.
This study investigates the preparation of ultrahigh-strength AZ80 magnesium alloy bulks using room temperature multidirectional forging (MDF) at different strain rates. The focus is on elucidating the effects of multidirectional loading and strain rates on grain refinement and the subsequent impact on the mechanical properties of the AZ80 alloy. Unlike hot deformation, the alloy subjected to room temperature MDF exhibits a lamellar twinned structure with multi-scale interactions. The key to achieving effective room temperature MDF of the alloy lies in combining multidirectional loading with small forging strains per pass (6%). This approach not only maximizes the activation of twinning to accommodate deformation but ensures sufficient grain refinement. Microstructural analysis reveals that the evolution of the grain structure in the alloy during deformation results from the competition between {101¯2} twinning or twinning variant interactions and detwinning. Increasing the forging rate effectively activates more twin variants, and additional deformation passes significantly enhance twin interaction levels and dislocation density. Furthermore, at a higher strain rate, more pronounced dislocation accumulation facilitates the transformation of twin structures into high-angle grain boundaries, promoting texture dispersion and suppressing detwinning. The primary strengthening mechanisms in room temperature MDF samples are grain refinement and dislocation strengthening. While increased dislocation density raises yield strength, it reduces post-yield work hardening capacity. After two passes of MDF at a higher strain rate, the alloy achieves an optimal balance of strength and ductility, with a tensile strength of 462 MPa and an elongation of 5.1%, significantly outperforming hot-deformed magnesium alloys. Full article
(This article belongs to the Special Issue Microstructure, Mechanical Properties, and Deformation Characteristics of Metals and Alloys—2nd Edition)
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12 pages, 2314 KiB  
Article
Simulated Body Fluid-Assisted Stress Corrosion Cracking of a Rapidly Solidified Magnesium Alloy RS66
by R. K. Singh Raman, Lokesh Choudhary and Dan Shechtman
Materials 2024, 17(16), 3967; https://doi.org/10.3390/ma17163967 - 9 Aug 2024
Viewed by 795
Abstract
This study investigated the simulated body fluid-assisted stress corrosion cracking (SCC) of an Al-free magnesium alloy (RS66) and a common Al-containing magnesium alloy (AZ91), the former being more suitable for temporary implant applications (however, we used AZ91 for comparison since there are considerable [...] Read more.
This study investigated the simulated body fluid-assisted stress corrosion cracking (SCC) of an Al-free magnesium alloy (RS66) and a common Al-containing magnesium alloy (AZ91), the former being more suitable for temporary implant applications (however, we used AZ91 for comparison since there are considerable reports on SCC in this alloy). The investigation includes SCC tests under simultaneous conditions of mechanical loading and imposed electrochemical potential that established a combined effect of hydrogen and anodic dissolution as the embrittlement mechanism. Though the RS66 alloy possesses impressive mechanical properties in non-corrosive environments (as a result of its fine grain size), both alloys suffered significant embrittlement when tested in simulated body fluid. The susceptibility of the RS66 alloy to SCC was ~25% greater than that of AZ91, which is attributed to the greater resistance of AZ91 to corrosion/localised corrosion because of its Al content. Full article
(This article belongs to the Special Issue Microstructure, Mechanical Properties, and Deformation Characteristics of Metals and Alloys—2nd Edition)
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11 pages, 4108 KiB  
Article
USAF Characteristic K Approach: A Robust Tool for Predicting Fatigue Crack Growth under Various Underload Spectra
by Kushagra Tiwari, Alankar Alankar, R. K. Singh Raman and Rhys Jones
Materials 2024, 17(13), 3303; https://doi.org/10.3390/ma17133303 - 4 Jul 2024
Viewed by 714
Abstract
This paper forms part of an ongoing investigation into the tools required in linear elastic fracture mechanics (LEFM) for evaluating the durability of components designed for limited life replacement. In this study, we demonstrate that the USAF ‘Characteristic K’ method, when combined [...] Read more.
This paper forms part of an ongoing investigation into the tools required in linear elastic fracture mechanics (LEFM) for evaluating the durability of components designed for limited life replacement. In this study, we demonstrate that the USAF ‘Characteristic K’ method, when combined with the Hartman–Schijve adaptation of the NASGRO crack growth formula, can predict the impact of underloads on the propagation of small cracks in aluminum alloy AA7050-T7451 with reasonable accuracy. The published da/dN versus ΔK small crack growth curves associated with five specific underload spectra are examined. It is found that, in each case, there is reasonably good agreement between the predicted and the measured curves. To the best of the author’s knowledge, this paper is the first to highlight the ability of the USAF Characteristic K approach, when coupled with the Hartman–Schijve equation, to reasonably accurately predict the growth of small cracks subjected to a range of underload spectra. Full article
(This article belongs to the Special Issue Microstructure, Mechanical Properties, and Deformation Characteristics of Metals and Alloys—2nd Edition)
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14 pages, 3938 KiB  
Article
Microstructure Evolution and Strengthening Mechanism of Dual-Phase Mg–8.3Li–3.1Al–1.09Si Alloys during Warm Rolling
by Ying Wang, Guangying Wu, Bingbing Liang, Yongquan He, Changhong Liu, Junwei Liu and Guobing Wei
Materials 2024, 17(10), 2321; https://doi.org/10.3390/ma17102321 - 14 May 2024
Viewed by 798
Abstract
In this study, the rolling process of the warm-rolled duplex-phase Mg–8.3Li–3.1Al–1.09Si alloy and the strengthening mechanism of as-rolled Mg–Li alloy were investigated. The highest ultimate tensile strength (UTS, 323.66 ± 19.89 MPa) could be obtained using a three-pass rolling process with a 30% [...] Read more.
In this study, the rolling process of the warm-rolled duplex-phase Mg–8.3Li–3.1Al–1.09Si alloy and the strengthening mechanism of as-rolled Mg–Li alloy were investigated. The highest ultimate tensile strength (UTS, 323.66 ± 19.89 MPa) could be obtained using a three-pass rolling process with a 30% thickness reduction for each pass at 553 K. The strength of the as-rolled LAS831 alloy is determined by a combination of second-phase strengthening, grain refinement strengthening, dislocation strengthening, and load-transfer reinforcement. Of these factors, dislocation strengthening, which is caused by strain hardening of the α-Mg phase, can produce a good strengthening effect but also cause a decrease in plasticity. The Mg2Si phase is broken up into particles or strips during the rolling process. After three passes, the AlLi particles were transformed into an AlLi phase, and the Mg2Si particles and nanosized AlLi particles strengthened the second phase to form a hard phase. The average size of the DRXed β-Li grains decreased with each successive rolling pass, and the average size of recrystallized grains in the three-pass-rolled LAS831 alloy became as low as 0.27 μm. The interface between the strip-like Mg2Si phase and the α-Mg phase is characterized by semicoherent bonding, which can promote the transfer of tensile and shear forces from the matrix to the strip-like Mg2Si phase, thereby improving the strength of the matrix and thus strengthening the LAS831 alloy. Full article
(This article belongs to the Special Issue Microstructure, Mechanical Properties, and Deformation Characteristics of Metals and Alloys—2nd Edition)
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