Bulk Al-Al<sub>3</sub>Zr composite prepared by mechanical alloying and hot extrusion for high-temperature applications

E. Pourkhorshid; M. H. Enayati; S. Sabooni; F. Karimzadeh; M. H. Paydar

doi:10.1007/s12613-017-1481-7

Volume 24 Issue 8

Aug. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(8): 937-942

E. Pourkhorshid, M. H. Enayati, S. Sabooni, F. Karimzadeh, and M. H. Paydar, Bulk Al-Al₃Zr composite prepared by mechanical alloying and hot extrusion for high-temperature applications, Int. J. Miner. Metall. Mater., 24(2017), No. 8, pp. 937-942. https://doi.org/10.1007/s12613-017-1481-7

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E. Pourkhorshid, M. H. Enayati, S. Sabooni, F. Karimzadeh, and M. H. Paydar, Bulk Al-Al3Zr composite prepared by mechanical alloying and hot extrusion for high-temperature applications, Int. J. Miner. Metall. Mater., 24(2017), No. 8, pp. 937-942. https://doi.org/10.1007/s12613-017-1481-7

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Research Article

Bulk Al-Al₃Zr composite prepared by mechanical alloying and hot extrusion for high-temperature applications

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Corresponding author:
S. Sabooni E-mail: s.sabooni@ma.iut.ac.ir
Received: 19 October 2016; Revised: 25 March 2017; Accepted: 27 March 2017

Abstract

Abstract

Bulk Al/Al₃Zr composite was prepared by a combination of mechanical alloying (MA) and hot extrusion processes. Elemental Al and Zr powders were milled for up to 10 h and heat treated at 600℃ for 1 h to form stable Al₃Zr. The prepared Al₃Zr powder was then mixed with the pure Al powder to produce an Al-Al₃Zr composite. The composite powder was finally consolidated by hot extrusion at 550℃. The mechanical properties of consolidated samples were evaluated by hardness and tension tests at room and elevated temperatures. The results show that annealing of the 10-h-milled powder at 600℃ for 1 h led to the formation of a stable Al₃Zr phase. Differential scanning calorimetry (DSC) results confirmed that the formation of Al₃Zr began with the nucleation of a metastable phase, which subsequently transformed to the stable tetragonal Al₃Zr structure. The tension yield strength of the Al-10wt%Al₃Zr composite was determined to be 103 MPa, which is approximately twice that for pure Al (53 MPa). The yield stress of the Al/Al₃Zr composite at 300℃ is just 10% lower than that at room temperature, which demonstrates the strong potential for the prepared composite to be used in high-temperature structural applications.
- aluminum matrix nanocomposites;
- mechanical alloying;
- hot extrusion;
- aluminides;
- powder metallurgy

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