Diffusion Phenomena in the Joining of Advanced Metallic Materials

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

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 5516

Special Issue Editor


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Guest Editor
Metallurgical and Materials Engineering Department, Faculty of Engineering, Oporto University, 4099-002 Porto, Portugal
Interests: metal matrix nanocomposites; nanomaterials; reactive multilayers; microstructural characterization; advanced materials; joining technologies; titanium alloys; diffusion bonding
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Special Issue Information

Dear Colleagues,

Advanced materials generally require the development of novel joining techniques, as this is crucial to integrate them into functional structures and to widen their application field. Additionally, joining constitutes a technology which influences all the industrial sectors, playing a key role in the economic and social development of a country.

For instance, diffusion bonding and brazing are two straightforward techniques for producing sound and reliable joints, since these processes are capable of joining a wide range of materials of interest in the aerospace industry, as well as in many other industrial applications, offering remarkable advantages over conventional fusion welding processes.

In these joining processes and in others, diffusion phenomena play an important role. Understanding these different transport phenomena at many levels, from atomistic to macro, is crucial for the characterization of the joints interfaces. The diffusion can be the principal mechanism for joint formation as in a solid-state diffusion bonding process or can only play a role in a specific state to ensure bonding.

This Special Issue aims at showcasing the recent progress in the joining technologies of advanced materials, with particular attention to the microstructure–mechanical properties relationships of the bonded joints based on the diffusion process. Both theoretical and experimental research, review articles, and novel results are welcome.

Prof. Sónia Simões
Guest Editor

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Keywords

  • joining processes
  • advanced materials
  • diffusion
  • brazing
  • friction stir welding
  • microstructural characterization

Published Papers (2 papers)

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15 pages, 2893 KiB  
Article
Role of NaCl, CO2, and H2S on Electrochemical Behavior of 304 Austenitic Stainless Steel in Simulated Oil Industry Environment
by Hany S. Abdo and Asiful H. Seikh
Metals 2021, 11(9), 1347; https://doi.org/10.3390/met11091347 - 27 Aug 2021
Cited by 6 | Viewed by 2372
Abstract
The electrochemical behavior of 304 austenitic stainless steel (304ASS) was studied by different methods such as potentiodynamic polarization, EIS, SEM, and Raman spectroscopy. Potentiodynamic polarization data suggest that 304 ASS could be more susceptible to corrosion due to the presence of H2 [...] Read more.
The electrochemical behavior of 304 austenitic stainless steel (304ASS) was studied by different methods such as potentiodynamic polarization, EIS, SEM, and Raman spectroscopy. Potentiodynamic polarization data suggest that 304 ASS could be more susceptible to corrosion due to the presence of H2S. The coexistence of H2S and Cl-type ionic species in 304 ASS lead to a decrease in the corrosion resistance as compared to the H2S-free condition. It is seen that CO2 helps form a passive layer on the metallic surface, which eventually decreases its corrosion rate. Raman spectroscopy analysis shows that the passive layer developed under different condition consists of FeCO3, FeS2, Fe2O3, Fe(OH)2, etc. SEM images further confirm that elemental S and Cl can infiltrate the passive film and cause the passive film to deteriorate. Full article
(This article belongs to the Special Issue Diffusion Phenomena in the Joining of Advanced Metallic Materials)
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12 pages, 5035 KiB  
Article
Diffusion Bonding of Ti6Al4V to Al2O3 Using Ni/Ti Reactive Multilayers
by Marcionilo Silva, Jr., Ana S. Ramos, M. Teresa Vieira and Sónia Simões
Metals 2021, 11(4), 655; https://doi.org/10.3390/met11040655 - 17 Apr 2021
Cited by 7 | Viewed by 2362
Abstract
This paper aims to investigate the diffusion bonding of Ti6Al4V to Al2O3. The potential of the use of reactive nanolayered thin films will also be investigated. For this purpose, Ni/Ti multilayer thin films with a 50 nm modulation period [...] Read more.
This paper aims to investigate the diffusion bonding of Ti6Al4V to Al2O3. The potential of the use of reactive nanolayered thin films will also be investigated. For this purpose, Ni/Ti multilayer thin films with a 50 nm modulation period were deposited by magnetron sputtering onto the base materials. Diffusion bonding experiments were performed at 800 °C, under 50 MPa and a dwell time of 60 min, with and without interlayers. Microstructural characterization of the interface was conducted through scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS). The joints experiments without interlayer were unsuccessful. The interface is characterized by the presence of a crack close to the Al2O3 base material. The results revealed that the Ni/Ti reactive multilayers improved the diffusion bonding process, allowing for sound joints to be obtained at 800 °C for 60 min. The interface produced is characterized by a thin thickness and is mainly composed of NiTi and NiTi2 reaction layers. Mechanical characterization of the joint was assessed by hardness and reduced Young’s modulus distribution maps that enhance the different phases composing the interface. The hardness maps showed that the interface exhibits a hardness distribution similar to the Al2O3, which can be advantageous to the mechanical behavior of the joints. Full article
(This article belongs to the Special Issue Diffusion Phenomena in the Joining of Advanced Metallic Materials)
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