Special Issue "Microstructure and Mechanical Properties of Alloys"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Physics".

Deadline for manuscript submissions: 31 July 2020.

Special Issue Editor

Prof. João Pedro Oliveira
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Guest Editor
Department of Mechanical and Industrial, Universidade Nova de Lisboa, Portugal
Interests: welding and additive manufacturing of advanced materials, including shape memory and high entropy alloys. He used advanced characterization techniques, namely high energy synchrotron X-ray diffraction to understand processing-microstructure- properties relationships
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Special Issue Information

Dear Colleagues,

The microstructure of metallic engineering alloys can be controlled via thermal, mechanical, or thermomechanical processes. Currently, more and more advanced engineering alloys are experiencing significant improvements in their mechanical properties, owing to the development of suitable microstructures. The microstructural evolution is often rationalized based on advanced materials’ characterization and simulation tools. Additionally, the impact of different microstructural features on the mechanical behavior of the structural and functional parts must be addressed so as to correlate process–microstructure–properties relationships.

This Special Issues aims to address the microstructural evolution and its impact on the mechanical properties of advanced engineering alloys. Papers dealing with processing techniques, modeling of the mechanical behavior, characterization of material microstructure, influence of environmental parameters, and temperature dependence, as well as advanced applications, are encouraged.

Dr. Joao Pedro Oliveira
Guest Editor

Keywords

  • microstructure
  • mechanical properties
  • thermomechanical processing
  • materials characterization
  • modelling

Published Papers (2 papers)

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Research

Open AccessArticle
The Application of Chemical Polishing in TEM Sample Preparation of Zirconium Alloys
Materials 2020, 13(5), 1036; https://doi.org/10.3390/ma13051036 - 25 Feb 2020
Abstract
Hydride artefacts are commonly induced by the TEM sample preparation process in Zirconium alloys as hydrogen-sensitive metals, including electron polishing and focused ion beam (FIB) technology. In the research, we present the application of chemical polishing with a solution of 10HF:45HNO3:45H [...] Read more.
Hydride artefacts are commonly induced by the TEM sample preparation process in Zirconium alloys as hydrogen-sensitive metals, including electron polishing and focused ion beam (FIB) technology. In the research, we present the application of chemical polishing with a solution of 10HF:45HNO3:45H2O to prepare the disk samples for TEM observation in zirconium alloys. The thinning efficiency of chemical polishing is 25 μm per minute. XRD patterns indicate that the chemical polishing actually eliminates the macro- and micro-stress induced by mechanical grinding. TEM observation demonstrates that chemical polishing reduces the amount of hydride artefacts, especially hydrides with large size. It is proposed that induced stress provides driving force for hydride artefact formation. Compared with traditional mechanical grinding, the advantages of chemical polishing are high efficiency, free of induced stress, less induced hydride artefacts and bend contours. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Alloys)
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Open AccessArticle
Influence of Annealing on the Damping Behavior of Ni-Cu-Mn-Ga Ferromagnetic Shape Memory Alloys
Materials 2020, 13(2), 480; https://doi.org/10.3390/ma13020480 - 19 Jan 2020
Abstract
Damping materials have attracted much attention for wide potential applications in the industry. Previous research shows that annealing treatment is an effective and costless way of improving the functional properties of conventional shape memory alloys. However, there are few investigations concerning the annealing [...] Read more.
Damping materials have attracted much attention for wide potential applications in the industry. Previous research shows that annealing treatment is an effective and costless way of improving the functional properties of conventional shape memory alloys. However, there are few investigations concerning the annealing effect of the ambient-temperature damping behavior. In this paper, we present the influence of annealing treatment on the martensitic transformation and damping behaviors of Ni 55 x Cu x Mn 25 Ga 20 (x = 0, 2, 4, 6) alloys within the ambient-temperature range. With increasing annealing time, the martensitic transformation temperature and the temperature span of martensitic transformation decrease. Moreover, annealing treatment greatly enhances the twin boundary damping peak of martensite. The X-ray diffraction (XRD) measurement demonstrates that annealing can improve the degree of L2 1 atomic order, which relieves the pinning effects for the twin boundary motion and thus leads to the enhancement of the twin boundary damping of these alloys. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Alloys)
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