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(Solved): For a binary eutectic phase diagram shown here. Match the proper description of these five microstr ...
For a binary eutectic phase diagram shown here. Match the proper description of these five microstructures. All structures started from and cooling down to the listed temperature. Assume equilibrium conditions. a) An alloy with the eutectic composition, at a temperature below the eutectic temperature b) An alloy with the eutectic composition, at a temperature above the eutectic temperature c) An alloy with hypo-eutectic (less than eutectic, toward -phase) composition, at a temperature above the eutectic temperature with 2 phases present e) An alloy with a composition below the solubility limit of the a-phase, at the eutectic temperature f) An alloy with a composition below the maximum solubility limit but above the minimum solubility limit of the a-phase, at room temperature
Expert Answer
a) hypo eutectic alloy means alpha-rich composition above the eutectic temperature we are having alpha plus Liquid phase Therefore, This corresponds to b) again hypo alloy with composition more than maximum solubility of beta in alpha and temperature below eutectic the region is alpha and beta phase. now as alpha is in excess we will have eutectic alpha with the eutectic structure of alpha and beta.Therefore, This corresponds to c) eutectic composition alloy with a temperature more than eutectic temperature only has the liquid phase. the Image of this is not given.d)eutectic composition alloy with a temperature less than eutectic temperature only has the liquid phase will give eutectic structure (lamella structure) of alpha and beta.Therefore, this corresponds to e) alloy with composition less than the solubility of beta in alpha at eutectic composition gives only one single alpha phase.Therefore, corresponding to f) this is the same as (e) when we are at eutectic temperature when we cool it to room temperature it goes to alpha and beta regions. so beta will precipitate out of alpha.Therefore, corresponds to