Chapter 9_Part_7

Chapter 9_Part_7 - Development of microstructure in...

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31 MSE 2090: Introduction to Materials Science Chapter 9, Phase Diagrams Development of microstructure in eutectic alloys (V) Compositions other than eutectic but within the range of the eutectic isotherm Primary α phase is formed in the α + L region, and the eutectic structure that includes layers of α and β phases (called eutectic α and eutectic β phases) is formed upon crossing the eutectic isotherm. L →α + L →α + β
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32 MSE 2090: Introduction to Materials Science Chapter 9, Phase Diagrams Development of microstructure in eutectic alloys (VI) Microconstituent – element of the microstructure having a distinctive structure. In the case described in the previous page, microstructure consists of two microconstituents, primary α phase and the eutectic structure . Although the eutectic structure consists of two phases, it is a microconstituent with distinct lamellar structure and fixed ratio of the two phases.
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33 MSE 2090: Introduction to Materials Science Chapter 9, Phase Diagrams
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Chapter 9_Part_7 - Development of microstructure in...

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