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Microstructure characterization and formation mechanism of functionally graded Al-TiAl3 insitu composite by liquid-solid interaction
Shahid Bahonar Univ Kerman, Dept Mat Engn & Met, Kerman 7618868366, Iran.;Shahid Bahonar Univ Kerman, Young Researchers Soc, Kerman, Iran..ORCID iD: 0000-0002-5818-0599
Shahid Bahonar Univ Kerman, Dept Mat Engn & Met, Kerman 7618868366, Iran..ORCID iD: 0000-0003-1779-8728
2018 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 766, p. 721-728Article in journal (Refereed) Published
Abstract [en]

In this paper, microstructure and formation mechanism of functionally graded Al-TiAl3 insitu composite fabricated by solid-liquid interaction was investigated. Mechanism of formation and distribution of the intermetallic particles was determined and it was in good agreement with computational thermodynamic calculations results. It was found that the gradient microstructure for Al-TiAl3 insitu composite was obtained at 1173 K (900 degrees C) holding for 180 min which included blocky and plate particles. The Al/Ti interface was changed from flat to irregular form at 1173 K (900 degrees C) due to diffusion of Al in solid Ti. The role of temperature and holding time was found to be important for formation and distribution of both blocky and plate TiAl3 particles. A critical solute value equal to 2.7 wt% was determined for dissolved Ti. Higher concentrations than the critical value led to the formation of blocky particles (mainly during heating) while lower concentrations led to the formation of plate particles (mainly during cooling). The gradient distribution of intermetallic particles in Al matrix led to a gradient hardness.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 766, p. 721-728
Keywords [en]
Al-TiAl3 insitu FGM, Microstructure, Blocky TiAl3, Plate-like TiAl3, Computational thermodynamics, Hardness
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-263984DOI: 10.1016/j.jallcom.2018.07.011ISI: 000444617200086Scopus ID: 2-s2.0-85049564896OAI: oai:DiVA.org:kth-263984DiVA, id: diva2:1371587
Conference
24th International Symposium on Metastable, Amorphous and Nanostructured Materials (ISMANAM), JUN 18-23, 2017, San Sebastian, Spain
Note

QC 20191121

Available from: 2019-11-20 Created: 2019-11-20 Last updated: 2019-11-21Bibliographically approved

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Yousefi, MaryamDoostmohammadi, Hamid
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