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Metals 2016, 6(12), 306; doi:10.3390/met6120306

Evaluation of Structural Stability of Materials through Mechanical Spectroscopy: Four Case Studies

Department of Industrial Engineering, University of Rome “Tor Vergata”, Via del Politecnico 1, 00133 Rome, Italy
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Author to whom correspondence should be addressed.
Academic Editors: João Manuel R. S. Tavares and Victor Hugo C. de Albuquerque
Received: 28 September 2016 / Revised: 18 November 2016 / Accepted: 30 November 2016 / Published: 5 December 2016
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Abstract

Microstructural stability is one of the utmost important requirements for metallic materials in engineering applications, particularly at high temperatures. The paper shows how Mechanical Spectroscopy (MS) (i.e., damping and dynamic modulus measurements) permits the monitoring of the evolution of lattice defects, porosity, and cracks which strongly affect the mechanical behavior of metals and sometimes lead to permanent damage. For this purpose, some applications of the technique to different metals and alloys (AISI 304 stainless steel, PWA 1483 single crystal superalloy, nanostructured FeMo prepared via SPS sintering and tungsten) of engineering interest are presented. These experiments have been carried out in lab conditions using bar-shaped samples at constant or increasing temperatures. The results can be used to orient the interpretation of frequency and damping changes observed through other instruments in components of complex shape during their in-service life. View Full-Text
Keywords: microstructure stability; mechanical spectroscopy; damping; dynamic modulus; AISI 304; PWA 1483; nano-structured FeMo alloy; tungsten microstructure stability; mechanical spectroscopy; damping; dynamic modulus; AISI 304; PWA 1483; nano-structured FeMo alloy; tungsten
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Costanza, G.; Montanari, R.; Richetta, M.; Tata, M.E.; Varone, A. Evaluation of Structural Stability of Materials through Mechanical Spectroscopy: Four Case Studies. Metals 2016, 6, 306.

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