Special Issue "Machining and Finishing of Nickel and Titanium Alloys"

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

Deadline for manuscript submissions: 31 October 2018

Special Issue Editors

Guest Editor
Prof. Dr. Naiara Ortega

Centre of Advanced Manufacturing Technologies for Aeronautics CFAA; Department of Mechanical Engineering, University of the Basque Country; EIB, Alameda de Urquijo s/n, 48013 Bilbao, Spain
Website | E-Mail
Interests: machining of superalloys; additive manufacturing; machining; manufacturing of aeroengine components; dimensional metrology
Co-Guest Editor
Prof. Dr. Luis Norberto López de Lacalle

Centre of Advanced Manufacturing Technologies for Aeronautics CFAA; Department of Mechanical Engineering, University of the Basque Country; EIB, Alameda de Urquijo s/n, 48013 Bilbao, Spain
Website | E-Mail
Interests: machining of superalloys; additive manufacturing; welding; coatings; machining; manufacturing of aeroengine components; vibrations in manufacturing processes

Special Issue Information

Dear Coleagues,

Nickel and titanium alloys are high-temperature resistant alloys, essential in many applications. Gas turbines, fuel nozzles, heat treating fixtures, and furnace muffles are some examples where these materials must stand up to high heat, extreme oxidation potential, and cycling. However, these materials are also characterized by their low machinability. With the aim of dealing with this drawback, new machining and finishing processes are being developed. They enable optimized component shapes, surface finishing and surface integrity for specific applications.

Problems related to machining of components of nickel and titanium alloys are far from being solved. New cooling systems, tools and tool’s coatings, new abrasive processes and strategies are being investigated deeply. In addition, friendly and sustainable processes are including in the workshops.

The aim of this Special Issue is to highlight recent advancements related to machining and finishing of nickel and titanium based alloys mainly for aeroengine components. Machines, processes, assisted processes and new tools are now in a rapid evolution.

Prof. Dr. Naiara Ortega
Prof. Dr. Luis Norberto López de Lacalle
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 papers will be 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 1000 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

  • Machining of superalloys
  • Laser additive manufacturing
  • Abrasive machining and finishing
  • New emerging alloys: Gamma TiAl processing
  • Machinability
  • Surface integrity
  • Modeling of machining and grinding processes
  • Ceramics and PCBN: new tools
  • Integral blade rotors: the challenge
  • Cutting tools for the group ISO S alloys

Published Papers (1 paper)

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Research

Open AccessArticle An Investigation of the Micro-Electrical Discharge Machining of Nickel-Titanium Shape Memory Alloy Using Grey Relations Coupled with Principal Component Analysis
Metals 2017, 7(11), 486; doi:10.3390/met7110486
Received: 27 September 2017 / Revised: 26 October 2017 / Accepted: 5 November 2017 / Published: 9 November 2017
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Abstract
Shape memory alloys (SMAs) are advanced engineering materials which possess shape memory effects and super-elastic properties. Their high strength, high wear-resistance, pseudo plasticity, etc., makes the machining of Ni-Ti based SMAs difficult using traditional techniques. Among all non-conventional processes, micro-electric discharge machining (micro-EDM)
[...] Read more.
Shape memory alloys (SMAs) are advanced engineering materials which possess shape memory effects and super-elastic properties. Their high strength, high wear-resistance, pseudo plasticity, etc., makes the machining of Ni-Ti based SMAs difficult using traditional techniques. Among all non-conventional processes, micro-electric discharge machining (micro-EDM) is considered one of the leading processes for micro-machining, owing to its high aspect ratio and capability to machine hard-to-cut materials with good surface finish.The selection of the most appropriate input parameter combination to provide the optimum values for various responses is very important in micro-EDM. This article demonstrates the methodology for optimizing multiple quality characteristics (overcut, taper angle and surface roughness) to enhance the quality of micro-holes in Ni-Ti based alloy, using the Grey–Taguchi method. A Taguchi-based grey relational analysis coupled with principal component analysis (Grey-PCA) methodology was implemented to investigate the effect of three important micro-EDM process parameters, namely capacitance, voltage and electrode material.The analysis of the individual responses established the importance of multi-response optimization. The main effects plots for the micro-EDM parameters and Analysis of Variance (ANOVA) indicate that every parameter does not produce same effect on individual responses, and also that the percent contribution of each parameter to individual response is highly varied. As a result, multi-response optimization was implemented using Grey-PCA. Further, this study revealed that the electrode material had the strongest effect on the multi-response parameter, followed by the voltage and capacitance. The main effects plot for the Grey-PCA shows that the micro-EDM parameters “capacitance” at level-2 (i.e., 475 pF), “discharge voltage” at level-1 (i.e., 80 V) and the “electrode material” Cu provided the best multi-response. Full article
(This article belongs to the Special Issue Machining and Finishing of Nickel and Titanium Alloys)
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