Precipitation and Characterization of Light Alloys

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

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 5461

Special Issue Editor


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Guest Editor
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Interests: microstructure characterization; plastic deformation and recrystallization of light metals; mechanical property
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Special Issue Information

Dear Colleagues,

Light alloys such as aluminum and magnesium are important materials for the automobile, aircraft, and electronic industries. In recent decades, fruitful studies have reported the microstructure characteristics, mechanical properties, and advantages of light alloys and accelerated the progress in the field. However, there are still many unproven theories and unsolved problems in light alloys. Thus, to further trigger the development of light alloys, it is imperative to research the relationship between microstructure characteristics and mechanical properties more in depth. It is for this reason that we are launching the present Special Issue on “Precipitation and Characterization of Light Alloys”. This Special Issue shall collect outstanding research on light alloys around the world, including but not limited to heat treatment, plastic processing, microstructure characterization, mechanical properties, precipitation, phase transformation, magnesium, aluminum, titanium, shape memory alloy, SEM, EBSD, FIB, TEM, and in situ X-ray.

It is our pleasure to welcome you to submit your work to this Special Issue on “Precipitation and Characterization of Light Alloys” in the journal of Metals.

Dr. Qinghuan Huo
Guest Editor

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Keywords

  • heat treatment
  • microstructure characterization
  • mechanical properties
  • plastic processing
  • precipitation
  • phase transformation
  • magnesium
  • aluminum
  • titanium
  • shape memory alloy

Published Papers (4 papers)

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Research

13 pages, 7739 KiB  
Article
The Correlation between Texture Evolution and Recrystallization Behavior during Rheologic Forming of 2195 Al–Li Alloy Cylindric Shell
by Xiaona Wang, Wei Xiong, Ying Zheng and Jin Zhang
Metals 2023, 13(5), 853; https://doi.org/10.3390/met13050853 - 27 Apr 2023
Cited by 2 | Viewed by 1085
Abstract
Spinning extrusion forming (SEF) is a type of rheologic forming process for making complex structured aerospace components, such as ribbed cylindric shells. However, our understanding of the texture evolution and recrystallization behavior during the SEF process is still limited, especially in complex system [...] Read more.
Spinning extrusion forming (SEF) is a type of rheologic forming process for making complex structured aerospace components, such as ribbed cylindric shells. However, our understanding of the texture evolution and recrystallization behavior during the SEF process is still limited, especially in complex system like the 2195 Al–Li alloy, which is considered to be the ideal material candidate for aerospace vehicles because of its low density and high specific strength. In this study, we investigate the microstructural evolution of a 2195 Al–Li alloy-made cylindric shell component during SEF and subsequent solution treatment and discuss the recrystallization mechanism and its influence on the texture. It is found that particle-stimulated nucleation (PSN) occurs during the SEF process due to a large number of Al2Cu particles, which is responsible for the obvious reduction of texture components during SEF. Additionally, we show that the continuous dynamic recrystallization is responsible for the increased grains with {110} orientation, resulting in relatively stable brass texture components, even in the subsequent solution treatment. Full article
(This article belongs to the Special Issue Precipitation and Characterization of Light Alloys)
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17 pages, 3988 KiB  
Article
Effects of Specimen Thickness and Non-Isothermal Process on Creep Behavior of AA2024 Aluminum Alloy
by Xintong Wu, Lihua Zhan, Youliang Yang, Yongqian Xu, Qiliang Zhang and Xiaobo Yang
Metals 2023, 13(2), 409; https://doi.org/10.3390/met13020409 - 16 Feb 2023
Cited by 1 | Viewed by 1133
Abstract
Fiber metal laminate (FML) is a kind of lightweight material that has garnered much attention in recent years due to its excellent properties under tensile, flexure, and impact conditions. However, little attention has been paid to the evolution of aluminum alloy during the [...] Read more.
Fiber metal laminate (FML) is a kind of lightweight material that has garnered much attention in recent years due to its excellent properties under tensile, flexure, and impact conditions. However, little attention has been paid to the evolution of aluminum alloy during the FML forming process. In this paper, the effects of specimen thickness and the non-isothermal process on creep behavior of AA2024 aluminum alloy, which is generally used in FMLs, were systematically studied in terms of creep strain, mechanical properties, and microstructure. The results show that the microstructure and mechanical properties of the aluminum alloy layer are greatly affected by the creep age during the FML forming process, but the specimen thickness has little effect on the creep behavior under experimental conditions. During the non-isothermal process, the creep strain generated during the heating stage is about 40% of total strain. Compared with the isothermal process, the creep strain of the non-isothermal process increases by 20–40%, and the apparent activation energy Qc is larger. According to the creep behavior of AA2024 aluminum alloy during the non-isothermal process, a creep constitutive model was established to accurately simulate the deformation of FMLs. Full article
(This article belongs to the Special Issue Precipitation and Characterization of Light Alloys)
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16 pages, 4057 KiB  
Article
Influence of Mg Content on the Corrosion Behavior and Precipitation of Aged Al-Cu-Li-xMg Alloys
by Rong Wu, Zhenzhen Liu, Hong Ning, Dingding Lu, Zhihao Liu, Ya Meng, Jinfeng Li and Ruifeng Zhang
Metals 2023, 13(2), 341; https://doi.org/10.3390/met13020341 - 8 Feb 2023
Viewed by 1237
Abstract
Aluminum (Al)–copper (Cu)–lithium (Li) alloys are susceptible to environmental degradation, which limits the in-service lifetime of the components. Because of their complex composition, there are seldom studies focusing on corrosion behavior influenced by one single element, which is essential to clarify the corrosion [...] Read more.
Aluminum (Al)–copper (Cu)–lithium (Li) alloys are susceptible to environmental degradation, which limits the in-service lifetime of the components. Because of their complex composition, there are seldom studies focusing on corrosion behavior influenced by one single element, which is essential to clarify the corrosion mechanism. Herein, the sole influence of Mg on the corrosion behavior of Al–Cu–Li–xMg alloys was analyzed. Results revealed that the addition of Mg can affect the nucleation and precipitation process of the T1 precipitate, resulting in a difference of potential between grain interior and grain boundary. The precipitation of the T1 precipitate was promoted in a 0.7Mg alloy while impeded in a 1.1Mg alloy, due to the competition of Cu atoms and nucleation sites between T1 and S′. Two types of corrosion behavior of Al–Cu–Li–xMg alloys appeared due to the potential difference and continuity of grain boundaries. Continuous precipitates in grain boundaries and less precipitates within the grain are likely to cause intergranular corrosion (IGC), while more precipitates within the grain will result in pitting. Full article
(This article belongs to the Special Issue Precipitation and Characterization of Light Alloys)
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15 pages, 17720 KiB  
Article
Hot Compression Deformation Behavior and Microstructure of As-Cast and Homogenized AA2195 Al-Li Alloy
by Jin Zhang, Zemeng Liu and Dongfeng Shi
Metals 2022, 12(10), 1580; https://doi.org/10.3390/met12101580 - 23 Sep 2022
Cited by 2 | Viewed by 1197
Abstract
To understand the effect of the initial state of AA2195 Al-Li alloy on the forming process, as-cast and homogenized ingots were compressed by using a Gleeble-3150 thermo-mechanical simulator at different temperatures (360–480 °C) and strain rates (0.01–10 s−1). The hot compression [...] Read more.
To understand the effect of the initial state of AA2195 Al-Li alloy on the forming process, as-cast and homogenized ingots were compressed by using a Gleeble-3150 thermo-mechanical simulator at different temperatures (360–480 °C) and strain rates (0.01–10 s−1). The hot compression deformation behaviors and microstructural characteristics of the two types of ingots were systematically investigated. The as-cast alloy possessed a better hot compressibility with higher power dissipation efficiency and lower rheological stress than the homogenized alloy under the same deformation conditions. When the temperature was increased above 450 °C, all the alloys showed similar rheological curves. Based on the rheological stress curves, processing maps for the as-cast (AC) and homogenized (HG) alloys were established, and optimal processing domains were identified. In addition, the homogenized alloys were dominated by a fibrous microstructure during deformation, whereas the as-cast alloy produced fine crystals at low temperature (360 °C) and equiaxed crystals at high temperature (480 °C). Our results show that it is possible to use the as-cast 2195 Al-Li alloy as the initial billet to get complicated components. This is attributed to the dispersed eutectic phases, which can provide more nucleation sites for Dynamic Recrystallization (DRX) and Dynamic Recovery (DRV) during hot deformation. Full article
(This article belongs to the Special Issue Precipitation and Characterization of Light Alloys)
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