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Metals
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Superior Strength–Ductility Combination of Heterostructured Metallic Materials
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Superior Strength–Ductility Combination of Heterostructured Metallic Materials

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

Deadline for manuscript submissions: 25 May 2025 | Viewed by 1163

Special Issue Editors

Dr. Xinkun Zhu

E-Mail Website
Guest Editor
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, China
Interests: stacking fault energy; mechanical properties; gradient structure; deformation mechanism
Special Issues, Collections and Topics in MDPI journals
Dr. Yulan Gong

E-Mail Website
Guest Editor
Faculty of Science, Kunming University of Science and Technology, Kunming, China
Interests: metallic nanomaterials

Special Issue Information

Dear Colleagues,

Metallic materials often show the strength–ductility trade-off law, that is, metallic materials are usually either strong or ductile, but rarely to hold both at the same time. Nowadays, severe plastic deformation (SPD) techniques have been widely utilized to enhance strength to a much higher lever, which could be several times higher than their original coarse-grained counterparts. Unfortunately, the ductility sharply decreases to a relatively low degree, which could be attributed to the lack of strain hardening capacity. The raised heterostructured materials could solve the problem mentioned above. This Special Issue features studies on various kinds of heterostructured material processing route and the more in-depth deformation mechanisms.

Dr. Xinkun Zhu
Dr. Yulan Gong
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

  • heterostructured materials
  • mechanical incompatibility
  • geometrically necessary dislocations (GNDs)
  • hetero-deformation induced (HDI) hardening

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Published Papers (1 paper)

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Research

17 pages, 3265 KiB  
Article
Investigation of Mechanical Properties and Microstructural Evolution in Pure Copper with Dual Heterostructures Produced by Surface Mechanical Attrition Treatment
by Lele Sun, Xingfu Li, Cong Li, Yulan Gong, Zhengrong Fu, Jingran Yang, Shuwei Quan, Shen Qin and Xinkun Zhu
Metals 2024, 14(11), 1217; https://doi.org/10.3390/met14111217 - 25 Oct 2024
Viewed by 829
Abstract
Heterostructured materials consist of heterogeneous zones with dramatic variations in mechanical properties, and have attracted extensive attention due to their superior performance. Various heterostructured materials have been widely investigated in recent years. In the present study, a combination of two different types of [...] Read more.
Heterostructured materials consist of heterogeneous zones with dramatic variations in mechanical properties, and have attracted extensive attention due to their superior performance. Various heterostructured materials have been widely investigated in recent years. In the present study, a combination of two different types of heterogeneous structures, a surface bimodal structure and gradient structure, was designed using the traditional surface mechanical attrition treatment (SMAT) method in pure copper, and the mechanical properties and microstructural evolution of dual-heterostructure Cu were studied in depth. In total, 100 stainless steel balls with a diameter of 6 mm were utilized to impact the specimen surface at room temperature for a short period of time. In this work, the sample surface was divided into hard areas and soft areas, along with a roughly 90 μm gradient structure in the cross-sectional direction after 30 s of SMAT processing. After the partial SMAT processing, lasting 30 s, the strength increased to 158.0 MPa and a considerable ductility of 25.7% was sustained, which overcomes the strength–ductility trade-off. The loading–unloading–reloading (LUR) test was utilized to measure the HDI stress, and the result showed that the HDI stress of the partial SMAT sample was much higher than the annealed one, especially for the Cu-SMAT-30S specimen, the strength of which increased from 80.4 MPa to 153.8 MPa during the tensile test. An in situ digital image correlation (DIC) investigation demonstrated that the strain developed stably in the Cu-SMAT-10S specimen. Furthermore, electron backscatter diffraction (EBSD) was carried out to study the microstructural evolution after partial SMAT processing; the KAM value increased to 0.34 for the Cu-SMAT-10S specimen. This research provides insights for the effective combination of superior strength and good ductility in dual-heterostructure materials. Full article
(This article belongs to the Special Issue Superior Strength–Ductility Combination of Heterostructured Metallic Materials)
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