Starink, M.J. and Wang, S.C.
The thermodynamics of and strengthening due to co-clusters: general theory and application to the case of Al-Cu-Mg alloys.
Acta Materialia, 57, . (doi:10.1016/j.actamat.2009.01.021).
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.
||co-clusters, cosegregation, calorimetry, enthalpy, entropy, free energy, strengthening, modulus hardening, chemical hardening, guinier-preston, GPB, 2024, Al-Cu-Mg, Al-Mg-Si, co-segregation
||T Technology > TN Mining engineering. Metallurgy
||University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
||07 Nov 2008
||08 Jun 2012 12:26
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