| Autor: |
Anton Yu. Nalivaiko, A. A. Nepapushev, A. Semenyuk, K. Vorotilo, V.S. Buinevich, D. Yu. Kovalev, Stepan Vorotilo, G. V. Trusov, Nikita Stepanov, D. O. Moskovskikh, Alexander A. Gromov |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Journal of Alloys and Compounds. 895:162676 |
| ISSN: |
0925-8388 |
| Popis: |
Light-weight Al-Ti nanocomposites attract increasing attention due to the advancements in spacecraft and additive manufacturing. In this work, ab initio modeling, DSC, and in-situ XRD experiments were used to formulate a strategy for rapid fabrication of Al-Al3Ti nanocomposites with enhanced mechanical properties (ultimate tensile strength up to 437 MPa at room temperature and up to 109 MPa at 500 °С, ~6% elongation before failure), resulting from a mixed ductile-fragile deformation behavior. The investigated samples were produced by spark plasma sintering of high-energy ball-milled reactive composites Al-TiH2 leading to the precipitation of 0.05–0.25 µm Al3Ti particles from the nanostructured Al matrix. Samples with coarser TiH2 powder or higher TiH2 content featured a minor amount of transitional core-shell structures resulting from the incomplete conversion of the as-formed Ti particles into Al3Ti. The following phase and structure formation mechanism upon the heating of the reactive nanocomposite powders was proposed: Al + δ TiH 2 → ~ 450 − 500 °С Al [ Ti ] + β Ti [ Al ] + δ TiH 2 − x → ~ 550 − 600 °С Al + Al 3 Ti . Tentative guidelines for the sintering of Al-TiH2 composites were proposed based on the analysis of diffusion kinetics. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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