Analysis of Microstructure and Properties of a Ti–AlN Composite Produced by Selective Laser Melting

Ryszard Sitek , Maciej Szustecki , Łukasz Żrodowski , Bartłomiej Wysocki , Jakub Jaroszewicz , Paweł Wiśniewski , Jarosław Mizera

Abstract

Selective Laser Melting (SLM) is a manufacturing technique that is currently used for the production of functional parts that are difficult to form by the traditional methods such as casting or CNC (Computer Numerical Control) cutting from a wide range of metallic materials. In our study, a mixture of commercially pure titanium (Ti) and 15% at. aluminum nitride (AlN) was Selective Laser Melted to form three-dimensional objects. The obtained 4 mm edge cubes with an energy density that varied from 70 to 140 J/mm3 were examined in terms of their microstructure, chemical and phase composition, porosity, and Vickers microhardness. Scanning Electron Microscopy (SEM) observations of the etched samples showed inhomogeneities in the form of pores and unmelted and partly melted AlN particles in the fine-grained dendritic matrix, which is typical for titanium nitrides and titanium aluminum nitrides. The AlN particles remained unmelted in samples, but no porosity was observed in the interface area between them and the dendritic matrix. Additionally, samples fabricated with the presintering step had zones with different sizes of dendrites, suggesting a differing chemical composition of the matrix and the possibility of the formation of the phases forming an Ti–Al–N ternary system. The chemical composition in the microareas of the samples was determined using Energy Dispersive X-Ray Spectroscopy (EDS) and revealed differences in the homogeneity of the samples depending on the SLM process parameters and the additional presintering step. The phase composition, examined using X-ray Diffraction analysis (XRD), showed that samples were formed from Ti, TiN, and AlN phases. Porosity tests carried out using a computer microtomography revealed porosities in a range from 7% to 17.5%. The formed material was characterized by a relatively high hardness exceeding 700 HV0.2 over the entire cross-section, which depended on the manufacturing conditions.
Author Ryszard Sitek (FMSE / DMD)
Ryszard Sitek,,
- Division of Materials Design
, Maciej Szustecki - [Politechnika Warszawska]
Maciej Szustecki,,
-
-
, Łukasz Żrodowski (FMSE / DCFM)
Łukasz Żrodowski,,
- Division of Construction and Functional Materials
, Bartłomiej Wysocki (FMSE / DMD)
Bartłomiej Wysocki,,
- Division of Materials Design
, Jakub Jaroszewicz (FMSE / DMD)
Jakub Jaroszewicz,,
- Division of Materials Design
, Paweł Wiśniewski (FMSE / DMD)
Paweł Wiśniewski,,
- Division of Materials Design
, Jarosław Mizera (FMSE / DMD)
Jarosław Mizera,,
- Division of Materials Design
Journal seriesMaterials, ISSN 1996-1944
Issue year2020
Vol13
No10
Pages1-13
Keywords in EnglishTi–AlN composite; microstructure; SEM; Selective Laser Melting (SLM)
ASJC Classification2500 General Materials Science
DOIDOI:10.3390/ma13102218
Languageen angielski
File
materials-13-02218-v3.pdf 5.34 MB
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 17-09-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.285; WoS Impact Factor: 2018 = 2.972 (2) - 2018=3.532 (5)
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