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High-Performance Light Alloys
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High-Performance Light Alloys

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

Deadline for manuscript submissions: closed (10 October 2022) | Viewed by 5503

Special Issue Editors

Dr. Shenglu Lu

E-Mail Website
Guest Editor
Centre for Additive Manufacturing, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
Interests: additive manufacturing; titanium alloy; phase transformation; EBSD; grain boundary character distribution
Dr. Ganesh Kumar Meenashisundaram

E-Mail Website
Guest Editor
Additive Manufacturing Group, Singapore Institute of Manufacturing Technology, Singapore, Singapore
Interests: additive manufacturing; binder jetting; light metals and alloys; biomaterials; materials processing
Special Issues, Collections and Topics in MDPI journals
Dr. Zhilin Liu

E-Mail Website
Guest Editor
Stake Key Laboratory of High Peformance Complex Manufacturing, Light Alloys Research Institute, Central South University, Changsha 410083, China
Interests: metal solidification; micro- and nanomechanics; material characterization; crystallography of phase transformation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Light alloys of titanium (Ti), magnesium (Mg), and aluminum (Al) have excellent mechanical and physical properties. They have the potential to replace heavier iron (Fe)- and nickel (Ni)-based materials in transportation and aerospace industries targeting weight reduction that will cut down fuel consumption and subsequently mitigate greenhouse gas emissions. The net-zero ambition not only poses a big challenge to the light alloy metallurgist but also offers exciting research opportunities for the future. New alloy design and methodologies for successful fabrication of light alloys are of keen interest to scientists both in academia and industries, and substantial efforts have been devoted to new alloy development. However, it is difficult for these new alloys to replace the commercial materials at present. For instance, the decade-old Ti-6Al-4V alloy still accounts for half of the Ti material market. Novel approaches to renew or redevelop commercial materials to achieve an enhanced properties-to-cost ratio, following the principle of planification of material development, are of great significance both scientifically and economically. This Special Issue will cover research investigations that can significantly increase the properties of commercial light alloys with minimal-to-nil change to the composition of these materials. We also welcome the submission of review papers on this topic.

Thank you very much. We look forward to receiving your submissions.

Dr. Shenglu Lu
Dr. Ganesh Kumar Meenashisundaram
Dr. Zhilin Liu
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. Materials is an international peer-reviewed open access semimonthly 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

  • light metals
  • mechanical properties
  • grain boundary engineering
  • phase transformation
  • solidification
  • powder metallurgy

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Published Papers (3 papers)

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Research

12 pages, 12998 KiB  
Article
Abnormal Twinning Behavior Induced by Local Stress in Magnesium
by Dongfeng Shi and Jin Zhang
Materials 2022, 15(16), 5510; https://doi.org/10.3390/ma15165510 - 11 Aug 2022
Cited by 5 | Viewed by 1447
Abstract
This study investigated the twinning behavior with increasing compressive strain in rolled AZ31 alloy. With that purpose, a polycrystalline structure with an average grain size of 30 μm was utilized to perform the uniaxial compression tests. Microstructure evolution was traced by in situ [...] Read more.
This study investigated the twinning behavior with increasing compressive strain in rolled AZ31 alloy. With that purpose, a polycrystalline structure with an average grain size of 30 μm was utilized to perform the uniaxial compression tests. Microstructure evolution was traced by in situ electron backscattered diffraction (EBSD). Multiple primary twin variants and extension double twins were observed in the same grain. A comprehensive analysis of kernel average misorientation (KAM) and Schmid factor (SF) revealed that the nucleation of twins in one special grain is not only based on the SF criterion, but that it is also strongly influenced by surrounding grains. Moreover, the existing primary twins modified the inner and outer strain distribution close to the twin boundaries. With continued compression, the strain inside the primary twins stimulated the nucleation of double twins, while the strain in the matrixes facilitated twin growth. Therefore, the primary twin growth and the new nucleation of secondary twins could take place simultaneously in the same twinning system to meet the requirements of strain accommodation. Twinning behaviors are controlled by the combined effect of the Schmid factor, strain accommodation between surrounding grains, and variation in the local stress state. The local stress exceeded the critical resolved shear stress (CRSS), implying that twin nucleation is possible. Hence, the twinning process tends to be a response of the local stress rather than the applied stress. Full article
(This article belongs to the Special Issue High-Performance Light Alloys)
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9 pages, 2908 KiB  
Article
First Principle Study of MgSnLa Compounds in Mg-3Sn-1Mn-1La Alloy Processed by Rheo-Rolling
by Jian-Hong Wang and Zhan-Yong Zhao
Materials 2022, 15(4), 1361; https://doi.org/10.3390/ma15041361 - 12 Feb 2022
Cited by 2 | Viewed by 1152
Abstract
In order to obtain a high-performance heat-resistant Mg alloy during the rheo-rolling process, the electronic structure, elastic constants, binding energy and thermodynamic properties of the MgSnLa compounds were conducted by first-principle calculations. The results show that the MgSnLa compounds (La5Sn3 [...] Read more.
In order to obtain a high-performance heat-resistant Mg alloy during the rheo-rolling process, the electronic structure, elastic constants, binding energy and thermodynamic properties of the MgSnLa compounds were conducted by first-principle calculations. The results show that the MgSnLa compounds (La5Sn3, Mg17La2 and Mg2Sn) all show certain metallicity, and La5Sn3 has better mechanical properties (higher bulk modulus (46.47091 GPa) and shear modulus (26.40561 GPa)) than the other two phases. The binding energy reveals that La5Sn3 is the most stable phase in these composite phases (5.33 eV/atom); additionally, thermodynamic studies show that the structural stability of the MgSnLa compounds increases with the increase in temperature, and the temperature has the greatest effect on the stability of Mg17La2. These all provide an efficient guide for the widespread engineering applications of high-performance heat-resistant Mg alloy. Full article
(This article belongs to the Special Issue High-Performance Light Alloys)
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14 pages, 5174 KiB  
Article
Eutectic Phase Characterization and Mechanical Properties of Al-Cu Alloy Ingot Solidified with Ultrasonic Treatment
by Ruiqing Li, Fang Dong, Yun Zhang, Pinghu Chen and Xiaoqian Li
Materials 2022, 15(3), 1067; https://doi.org/10.3390/ma15031067 - 29 Jan 2022
Cited by 3 | Viewed by 2291
Abstract
An Al-Cu alloy ingot was produced with the application of ultrasonic melt treatment. The effects of ultrasonication on the grain structure, eutectic phase, solution, and tensile properties of the alloy were analyzed. The volume and distribution of the eutectic phase were quantitatively evaluated [...] Read more.
An Al-Cu alloy ingot was produced with the application of ultrasonic melt treatment. The effects of ultrasonication on the grain structure, eutectic phase, solution, and tensile properties of the alloy were analyzed. The volume and distribution of the eutectic phase were quantitatively evaluated based on stereological theory. The results are as follows: The grain-refinement efficiency at the center, 1/2 radius and edge of the ingot is 33.99%, 45.2% and 41.68%, respectively, under the action of an ultrasonic field. Ultrasonics improves the solid solubility of the Al-Cu alloy element, in which the solid solubility of Cu increases from 0.85% to 1.42%. The ultrasonic field improves the dispersion degree of the eutectic phase and reduces the volume fraction and eutectic phase number per unit volume. The mechanical properties of the Al-Cu alloy were improved by an ultrasonic field. Full article
(This article belongs to the Special Issue High-Performance Light Alloys)
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