The thermodynamics of and strengthening due to co-clusters: general theory and application to the case of Al-Cu-Mg alloys
Co-clusters in ternary or higher order metallic alloys are metastable structures involving two or more distinct alloying atoms that retain the structure of the host lattice. A thermodynamic model based on a single interaction energy of dissimilar nearest neighbour alloying elements is presented, and...
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| Format: | Article |
| Language: | English |
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2009.
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| Online Access: | Get fulltext |
| LEADER | 01342 am a22001333u 4500 | ||
|---|---|---|---|
| 001 | 63828 | ||
| 042 | |a dc | ||
| 100 | 1 | 0 | |a Starink, M.J. |e author |
| 700 | 1 | 0 | |a Wang, S.C. |e author |
| 245 | 0 | 0 | |a The thermodynamics of and strengthening due to co-clusters: general theory and application to the case of Al-Cu-Mg alloys |
| 260 | |c 2009. | ||
| 856 | |z Get fulltext |u https://eprints.soton.ac.uk/63828/1/Starink_%2526_Wang_Acta_Mater_2009c.pdf | ||
| 520 | |a Co-clusters in ternary or higher order metallic alloys are metastable structures involving two or more distinct alloying atoms that retain the structure of the host lattice. A thermodynamic model based on a single interaction energy of dissimilar nearest neighbour alloying elements is presented, and a model for the strengthening due to these co-cluster dimers is derived. The model includes a new treatment of (short-) order strengthening relevant to these co-clusters and further encompasses modulus hardening and chemical hardening. The models are tested against data on a wide range of Al-Cu-Mg alloys treated at temperatures between 20 and 220ºC. Both quantitative calorimetry data on the enthalpy change due to co-cluster formation and strengthening due to co-clusters is predicted well. It is shown that in general (short-range) order strengthening will be the main strengthening mechanism. | ||
| 655 | 7 | |a Article | |