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Metals
Special Issues
Forming Mechanism for Extrusion of Metals and Alloys
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Forming Mechanism for Extrusion of Metals and Alloys

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Casting, Forming and Heat Treatment".

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 6363

Special Issue Editors

Prof. Dr. Hui Yu

E-Mail Website
Guest Editor
Department of Material Forming and Control Engineering, Hebei University of Technology, Tianjin 300130, China
Interests: magnesium alloys; extrusion; caliber rolling; phase diagrams; crystal plasticity finite element models
Dr. Qinghang Wang

E-Mail Website
Guest Editor
Department of Material Forming and Control Engineering, Yangzhou University, Yangzhou 225012, China
Interests: magnesium alloys; extrusion; dynamic/static recrystallization; grain refinement; severe plastic deformation

Special Issue Information

Dear Colleagues,

Extrusion processing is a common method that is currently being used in the plastic forming of metals and alloys. Extrusion processing technology has become more widely used due to the rapid development of the metal processing industry. In recent years, in addition to improving direct/indirect extrusion processing methods, new technologies have been proposed. For instance, isothermal extrusion, lubrication extrusion, cold extrusion, etc., have been studied in depth and have been applied to numerous applications. The forming mechanism for the extrusion of metals and alloys, which includes the control and characterization of a material’s final properties and the analysis of the forming mechanism that is is activated during the extrusion processing, are the scope of this Special Issue. Metal extrusion technology is in the developmental stages in terms of theoretical and technological research. Fundamental research and technological innovation promote the integration of extrusion technology. It is particularly critical to find existing shortcomings, to attempt to make breakthroughs, and to continuously bring new research topics and development paths to the forefront. In addition, experts and scholars from various fields are required to be jointly devoted to researching extrusion processing technology and to promoting it to a higher field. 

In this Special Issue, we welcome articles that focus on novel extrusion technologies and their influence on the final mechanical properties and formability of materials, including steels and nonferrous alloys (magnesium/aluminum/titanium alloys, etc.). Fully controllable and low-cost extrusion methods are of specific interest. In addition, the forming mechanisms that take place during extrusion need to be unveiled as well. This Special Issue will collect regular research papers, reviews, and short communications.

Prof. Dr. Hui Yu
Dr. Qinghang Wang
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

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

  • extrusion
  • alloys
  • microstructure
  • mechanical properties
  • formability
  • forming mechanism
  • dislocation slip
  • twinning
  • deformation temperature

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Published Papers (3 papers)

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Research

9 pages, 3377 KiB  
Article
Influences of Mg17Al12 Phase Morphology on the Mechanical Properties of AZ80 Magnesium Alloy Subjected to Aging
by Zuo Xu, Lixin Huang, Meng Li, Zhihua Zhu and Chunhai Liu
Metals 2022, 12(6), 928; https://doi.org/10.3390/met12060928 - 27 May 2022
Cited by 8 | Viewed by 2056
Abstract
The influence of Mg17Al12 phase morphology on the mechanical properties of AZ80 magnesium alloy subjected to aging was studied. Scanning electron microscopy, X-ray diffraction analysis and hardness indentation were used to reveal the microstructural evolution and mechanical properties of alloys [...] Read more.
The influence of Mg17Al12 phase morphology on the mechanical properties of AZ80 magnesium alloy subjected to aging was studied. Scanning electron microscopy, X-ray diffraction analysis and hardness indentation were used to reveal the microstructural evolution and mechanical properties of alloys during aging. The results show that Mg17Al12 phase mostly formed at grain boundaries with discontinuous lamellas morphology during aging at 150 °C. In contrast, continuous short rod and spherical Mg17Al12 particles formed transgranularly as aged at 320 °C. Both the strength of the alloy and elongation under room temperature were slightly improved via 150 °C aging. Full article
(This article belongs to the Special Issue Forming Mechanism for Extrusion of Metals and Alloys)
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17 pages, 7411 KiB  
Article
Effect of 1wt%Zn Addition on Microstructure and Mechanical Properties of Mg-6Er Alloys under High Strain Rates
by Hui Yu, Junchao Ren, Shaoming Kang, Wei Yu, Zhifeng Wang, Jianhang Feng, Qingzhou Wang, Puguang Ji, Xin Zhang and Fuxing Yin
Metals 2022, 12(5), 883; https://doi.org/10.3390/met12050883 - 23 May 2022
Cited by 2 | Viewed by 1932
Abstract
In this study, we investigated the high strain rate response of Mg-6wt%Er alloys with 1wt%Zn addition by split Hopkinson pressure bar (SHPB) tests in a range of 900–2500 s−1. Their related microstructures were also characterized by optical microscopy (OM), scanning electron [...] Read more.
In this study, we investigated the high strain rate response of Mg-6wt%Er alloys with 1wt%Zn addition by split Hopkinson pressure bar (SHPB) tests in a range of 900–2500 s−1. Their related microstructures were also characterized by optical microscopy (OM), scanning electron microscopy (SEM), electron back-scattering diffraction (EBSD), and transmission electron microscopy (TEM). In particular, the twinning and stacking faults (SFs) in Mg-6Er and Mg-6Er-1Zn alloys are characterized, and the interactions between twin/SFs and dislocations are analyzed in detail. Compared with twins, the dispersed and dense SFs seem to more readily interact with dislocations, resulting in the enhancement of the strength of alloys. Especially at a high strain rate of 1450 s−1, dislocations are prone to tangle around the twins and SFs, forming low-angle grain boundaries (LAGBs). The addition of Zn in Mg-6Er can make LAGBs more easily transform into high-angle grain boundaries (HAGBs) due to the existence of SFs. Full article
(This article belongs to the Special Issue Forming Mechanism for Extrusion of Metals and Alloys)
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11 pages, 82211 KiB  
Article
Designing a Mixed Texture in Mg/Mg Laminated Composite via Bimetal Co-Extrusion to Ameliorate the Mechanical Anisotropy
by Haowei Zhai, Qinghang Wang, Bin Jiang, Yan Song, Guangjie Xue and Zhaoyang Jin
Metals 2022, 12(4), 637; https://doi.org/10.3390/met12040637 - 7 Apr 2022
Cited by 1 | Viewed by 1528
Abstract
Room-temperature (RT) mechanical anisotropy limits the broad applications of wrought magnesium (Mg) alloys. To weaken the anisotropy, here, we proposed a design idea to create a mixed texture. In the present study, we successfully fabricated the Mg-3Y/Mg-5Li (W3/L5, wt.%) laminated composite, having a [...] Read more.
Room-temperature (RT) mechanical anisotropy limits the broad applications of wrought magnesium (Mg) alloys. To weaken the anisotropy, here, we proposed a design idea to create a mixed texture. In the present study, we successfully fabricated the Mg-3Y/Mg-5Li (W3/L5, wt.%) laminated composite, having a mixed texture with a closely orthotropic shape, consisting of an ED-split component in the W3 layer and a TD-split in the L5 layer, via bimetal co-extrusion (ED and TD represent the extrusion and transverse directions, respectively). The mechanical results show that the W3/L5 laminated composite demonstrates a better isotropy at RT, indicating that forming a mixed texture is an effective method to reduce the anisotropy of wrought Mg alloys by bimetal co-extrusion. However, extremely poor interface shear strength, induced by rich O element voids on the interface, triggered poor interface bonding, leading to worse ultimate strength and elongation -to-failure. In future works, controlling co-extrusion parameters or implementing a suitable heat-treatment after extrusion will be necessary to further ameliorate the mechanical properties of the Mg/Mg laminated composites with mixed texture. Full article
(This article belongs to the Special Issue Forming Mechanism for Extrusion of Metals and Alloys)
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