Microstructure and strength modelling in Al-Cu-Mg alloys during non-isothermal treatments: Part 2 - Welds
Khan, I.N., Starink, M.J., Sinclair, I. and Wang, S.C. (2008) Microstructure and strength modelling in Al-Cu-Mg alloys during non-isothermal treatments: Part 2 - Welds. Materials Science and Technology, 24, 1411-1418. (doi:10.1179/174328408X317048).
The present work applies a model for microstructural evolution in the solid state and Al-Cu-Mg alloys and expands it in a computationally efficient way to include solid-liquid reactions in fusion welds. The model is used to predict local strength and hardness of the welds, using a formulation that incorporates hardening due to two types of precipitates, i.e. Cu-Mg co-clusters and the S phase precipitates. The model predictions are compared with hardness, differential scanning calorimetry and transmission electron microscopy data for a fusion welded 2024-T351 aluminium alloy. The model predicts solid state reactions and solid-liquid reactions including co-cluster dissolution, S phase formation, growth, coarsening and dissolution, co-cluster reformation on cooling, and solute partitioning on resolidification. The model predictions are in good agreement with the experimental results and illustrate the dominant role that (sub-)nanoscale co-clusters play in strengthening of welds. The yield strength of as welded material tested normal to the weld is mainly due to the co-clusters.
|Keywords:||microstructure and strength modelling, Al-Cu-Mg alloys, non-isothermal treatments, welds|
|Subjects:||T Technology > TN Mining engineering. Metallurgy
T Technology > TA Engineering (General). Civil engineering (General)
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences
|Date Deposited:||12 Feb 2009|
|Last Modified:||14 Jul 2013 01:03|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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