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Recent Advances in Additive Manufacturing and Fatigue Properties of Titanium...
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Recent Advances in Additive Manufacturing and Fatigue Properties of Titanium Alloys

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Additive Manufacturing".

Deadline for manuscript submissions: 20 August 2026 | Viewed by 796

Special Issue Editor

Dr. Ruipeng Guo

E-Mail Website
Guest Editor
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Interests: powder metallurgy; additive manufacturing; titanium alloys; high entropy alloys; fatigue property
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Titanium alloys have been extensively used in a wide range of applications in aerospace, biomedical, chemical, marine, automotive, and many other industries because of their high strength, low density, and excellent corrosion resistance.

The traditional methods used to manufacture titanium alloys are difficult and expensive because of titanium's low thermal conductivity, high tooling costs, and high affinity for oxygen pickup during thermal treatments. Additive manufacturing (AM) offers several advantages such as one-step near-net-shaped part fabrication, design flexibility, near-zero material wastage, and flexibility in manufacturing different types of components using other alloys, to name a few. Thus, the AM of titanium alloys has garnered significant attention over the past decade.

Moreover, in-depth studies of their deformation and fracture behavior under different external actions are still necessary because of the increasing demand for the optimization of their properties for different applications by varying process parameters and resulting microstructures.

For this open access Special Issue, we invite original research articles and review papers focused on (i) the development of titanium alloys for AM; (ii) the relationship between AM process parameters, fatigue and fracture, and its functional properties; (iii) modeling and design for performance optimization.

Dr. Ruipeng Guo
Guest Editor

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 250 words) can be sent to the Editorial Office for assessment.

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

  • titanium alloys
  • additive manufacturing
  • fatigue
  • fracture
  • deformation

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Published Papers (2 papers)

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Research

21 pages, 5364 KB  
Article
Effect of Process Parameters on the Quality and Dimensional Accuracy of TC11 Titanium Alloy Thin-Walled Parts Fabricated by Laser Powder Bed Fusion
by Dongwei Wang, Chang Shu, Siyuan Chen, Adel Abdel-Wahab, Khamis Essa and Xuedao Shu
Metals 2026, 16(4), 396; https://doi.org/10.3390/met16040396 - 3 Apr 2026
Viewed by 281
Abstract
To address the challenges of printing quality and dimensional accuracy in the fabrication of TC11 titanium alloy thin-walled components via laser powder bed fusion (L-PBF), this study systematically optimized the L-PBF process parameters and investigated the printing limits of thin-walled structures, providing theoretical [...] Read more.
To address the challenges of printing quality and dimensional accuracy in the fabrication of TC11 titanium alloy thin-walled components via laser powder bed fusion (L-PBF), this study systematically optimized the L-PBF process parameters and investigated the printing limits of thin-walled structures, providing theoretical and practical guidance for high-precision manufacturing. First, single-factor experiments were conducted to examine the effects of laser power, scanning speed, and hatch spacing on relative density. Subsequently, response surface analysis was performed using a Box–Behnken design to establish a predictive model with relative density and surface roughness as the response variables, enabling multi-objective parameter optimization. Based on the optimized parameters, a series of thin-walled structures with varying wall thicknesses were fabricated, the resulting printing defects were analyzed, and a mathematical model correlating wall thickness with limiting printing height was established. The response surface model exhibited excellent statistical significance, with an F-value of 0.9930 and a p-value of less than 0.0001, indicating a highly reliable fit. The coefficient of determination (R2) of the model was 0.9889, while the adjusted R2 and predicted R2 were 0.9747 and 0.9146, respectively, confirming the model’s good predictive capability. The optimal process parameters obtained through the model were a laser power of 190 W, a scanning speed of 1100 mm/s, and a hatch spacing of 0.10 mm. Validation experiments conducted under these conditions yielded a deviation of only 5.33% between the predicted and experimental comprehensive scores, demonstrating the accuracy of the model. A key achievement of this study is the establishment of a piecewise mathematical model relating wall thickness to limiting printing height: a cubic polynomial for wall thicknesses in the range of 0.2 ≤ t ≤ 0.5 mm (h=107.5t3−161.5t2+106.7t−5.86) and a quadratic polynomial for wall thicknesses in the range of 0.5 ≤ t ≤ 0.8 mm (h=− 0.25t2+34.89t+3.17). This model enables accurate prediction of the formability of thin-walled structures. Full article
(This article belongs to the Special Issue Recent Advances in Additive Manufacturing and Fatigue Properties of Titanium Alloys)
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27 pages, 7173 KB  
Article
Mechanical Origin of Twinning Variant Selection in Commercially Pure Titanium Under Plane Strain Compression
by Jean-Sébastien Lecomte, Mélaine Tournay, Émilie Rémy, Yudong Zhang, Éric Fleury and Christophe Schuman
Metals 2026, 16(4), 394; https://doi.org/10.3390/met16040394 - 2 Apr 2026
Viewed by 209
Abstract
The selection of deformation mechanisms in hexagonal close-packed (HCP) metals is strongly influenced by both crystallographic orientation and macroscopic deformation constraints. In commercially pure titanium, plastic deformation under constrained loading conditions involves a complex interplay between dislocation slip and deformation twinning, whose respective [...] Read more.
The selection of deformation mechanisms in hexagonal close-packed (HCP) metals is strongly influenced by both crystallographic orientation and macroscopic deformation constraints. In commercially pure titanium, plastic deformation under constrained loading conditions involves a complex interplay between dislocation slip and deformation twinning, whose respective activation cannot be fully described by classical stress-based criteria. In this study, the mechanical origin of slip and twinning variant selection in commercially pure titanium subjected to plane strain compression is investigated experimentally. Plane strain compression is used as a canonical loading condition representative of constrained deformation paths encountered in sheet metal forming. Interrupted in-situ electron backscatter diffraction is combined with slip trace and twin variant analyses to identify the active deformation mechanisms at the grain scale. Resolved shear stress calculations show that stress-based criteria provide a necessary first-order condition for the activation of both slip and twinning systems. While the Schmid factor reasonably predicts part of the observed slip activity, it fails to uniquely determine the selection of active twinning variants. A kinematic analysis reveals that twinning variant selection is governed by the compatibility between the deformation induced by twinning and the macroscopic strain constraints imposed by plane strain compression. Only variants whose deformation accommodates compression along the loading axis, extension along the free in-plane direction, and minimal strain along the constrained in-plane direction are preferentially activated. These results demonstrate that deformation mechanism selection in HCP titanium under constrained loading conditions results from a combined effect of resolved shear stress and kinematic compatibility. The proposed framework provides a physically grounded basis for interpreting deformation-induced texture evolution and offers clear perspectives for the development of crystal plasticity models incorporating twinning under complex strain paths. Full article
(This article belongs to the Special Issue Recent Advances in Additive Manufacturing and Fatigue Properties of Titanium Alloys)
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