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Surface Analysis of Wire-Electrical-Discharge-Machining-Processed Shape-Memory Alloys

Shape-memory alloys such as nitinol are gaining popularity as advanced materials in the aerospace, medical, and automobile sectors. However, nitinol is a difficult-to-cut material because of its versatile specific properties such as the shape-memory effect, superelasticity, high specific strength, h...

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Autores principales: Chaudhari, Rakesh, Vora, Jay J., Patel, Vivek, López de Lacalle, L. N., Parikh, D. M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7040585/
https://www.ncbi.nlm.nih.gov/pubmed/31979023
http://dx.doi.org/10.3390/ma13030530
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author Chaudhari, Rakesh
Vora, Jay J.
Patel, Vivek
López de Lacalle, L. N.
Parikh, D. M.
author_facet Chaudhari, Rakesh
Vora, Jay J.
Patel, Vivek
López de Lacalle, L. N.
Parikh, D. M.
author_sort Chaudhari, Rakesh
collection PubMed
description Shape-memory alloys such as nitinol are gaining popularity as advanced materials in the aerospace, medical, and automobile sectors. However, nitinol is a difficult-to-cut material because of its versatile specific properties such as the shape-memory effect, superelasticity, high specific strength, high wear and corrosion resistance, and severe strain hardening. Anunconventional machining process like wire-electrical-discharge-machining (WEDM) can be effectively and efficiently used for the machining of such alloys, although the WEDM-induced surface integrity of nitinol hassignificant impact on material performance. Therefore, this work investigated the surface integrity of WEDM-processed nitinol samples using digital microscopy imaging, scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) analysis. Three-dimensional analysis of the surfaces was carried out in two different patterns (along the periphery and the vertical plane of the machined surface) andrevealed that surface roughness was maximalat the point where the surface was largely exposed to the WEDM dielectric fluid. To attain the desired surface roughness, appropriate discharge energy is required that, in turn, requires the appropriate parameter settings of the WEDM process. Different SEM image analyses showed a reduction in microcracks and pores, and in globule-density size at optimized parameters. EDX analysis revealed the absence of wire material on the machined surface
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spelling pubmed-70405852020-03-09 Surface Analysis of Wire-Electrical-Discharge-Machining-Processed Shape-Memory Alloys Chaudhari, Rakesh Vora, Jay J. Patel, Vivek López de Lacalle, L. N. Parikh, D. M. Materials (Basel) Article Shape-memory alloys such as nitinol are gaining popularity as advanced materials in the aerospace, medical, and automobile sectors. However, nitinol is a difficult-to-cut material because of its versatile specific properties such as the shape-memory effect, superelasticity, high specific strength, high wear and corrosion resistance, and severe strain hardening. Anunconventional machining process like wire-electrical-discharge-machining (WEDM) can be effectively and efficiently used for the machining of such alloys, although the WEDM-induced surface integrity of nitinol hassignificant impact on material performance. Therefore, this work investigated the surface integrity of WEDM-processed nitinol samples using digital microscopy imaging, scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) analysis. Three-dimensional analysis of the surfaces was carried out in two different patterns (along the periphery and the vertical plane of the machined surface) andrevealed that surface roughness was maximalat the point where the surface was largely exposed to the WEDM dielectric fluid. To attain the desired surface roughness, appropriate discharge energy is required that, in turn, requires the appropriate parameter settings of the WEDM process. Different SEM image analyses showed a reduction in microcracks and pores, and in globule-density size at optimized parameters. EDX analysis revealed the absence of wire material on the machined surface MDPI 2020-01-22 /pmc/articles/PMC7040585/ /pubmed/31979023 http://dx.doi.org/10.3390/ma13030530 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Chaudhari, Rakesh
Vora, Jay J.
Patel, Vivek
López de Lacalle, L. N.
Parikh, D. M.
Surface Analysis of Wire-Electrical-Discharge-Machining-Processed Shape-Memory Alloys
title Surface Analysis of Wire-Electrical-Discharge-Machining-Processed Shape-Memory Alloys
title_full Surface Analysis of Wire-Electrical-Discharge-Machining-Processed Shape-Memory Alloys
title_fullStr Surface Analysis of Wire-Electrical-Discharge-Machining-Processed Shape-Memory Alloys
title_full_unstemmed Surface Analysis of Wire-Electrical-Discharge-Machining-Processed Shape-Memory Alloys
title_short Surface Analysis of Wire-Electrical-Discharge-Machining-Processed Shape-Memory Alloys
title_sort surface analysis of wire-electrical-discharge-machining-processed shape-memory alloys
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7040585/
https://www.ncbi.nlm.nih.gov/pubmed/31979023
http://dx.doi.org/10.3390/ma13030530
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