Re-visiting the ‘rule of mixture’ used in materials with multiple constituting phases: A technical note on morphological considerations in austenite case study

• Published in: Computational materials science 2012-12, Vol.65, p.528-535
• Main Authors: Prawoto, Y., Djuansjah, J.R.P., Shaffiar, N.B.
• Format: Article
• Language: English
• Subjects: Austenite; Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder; Constituting phase; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Homogenization; Materials science; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Rule of mixture; Steel
• ISSN: 0927-0256; 1879-0801
• DOI: 10.1016/j.commatsci.2012.08.008

[Display omitted] ► This technical note discusses about traditional rule of mixture and homogenization. ► The techniques were applied to austenitic steel with possible configuration of nine phases. ► It was found that the homogenization technique was capable in capturing the orthotropic characteristics of austenite. This is a technical note highlighting a method on how to perform averaging the elastic properties. The drawback of the traditional rule of mixture (ROM) is briefly discussed. The technique considers the effect of morphology based on classical continuum mechanics, taking the advantages of fracture mechanics. As an example, a model that simulates the possible configuration of constituting phases commonly found in austenite microstructure is chosen. The result is compared with traditional ROM. It is found that although similar, the result is better due to the stress amplification that is accommodated in the method, unlike the traditional ROM, which merely considers only the volumetric ratio.