Questions and Answers
What is the meaning of 'isomorphous' in the context of binary phase diagrams?
What is the name given to the lines separating the liquid and solid phases in an isomorphous system?
At point A in the Ni-Cu phase diagram, with T = 1100°C and C0 = 60 wt% Ni, how many phases are present?
At point B in the Ni-Cu phase diagram, with T = 1250°C and C0 = 65 wt% Cu, how many phases are present?
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What do we determine by knowing both the temperature (T) and initial composition (C0) in a phase diagram?
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What microstructural changes accompany the cooling of a C0 = 35 wt% Ni alloy under non-equilibrium (cored) cooling?
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What is the main mechanism that accomplishes the readjustments during the cooling of a C0 = 35 wt% Ni alloy under equilibrium cooling?
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What type of microstructure is revealed in the photomicrograph of an as-cast bronze alloy found in Syria, dated to the 19th century BC?
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In an isomorphous alloy, what effect does slow rate of cooling have on the resulting microstructure?
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What is the role of diffusion in both solid and liquid phases during the cooling of a C0 = 35 wt% Ni alloy under equilibrium cooling?
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Study Notes
Isomorphous Systems
- Isomorphous refers to binary phase diagrams where the components are completely soluble in each other in both solid and liquid states.
Phase Boundaries
- The lines separating the liquid and solid phases in an isomorphous system are called liquidus and solidus lines.
Phase Diagram Analysis
- Given a point on the phase diagram, knowing both the temperature (T) and initial composition (C0) allows us to determine the number of phases present.
- At point A in the Ni-Cu phase diagram, with T = 1100°C and C0 = 60 wt% Ni, two phases are present.
- At point B in the Ni-Cu phase diagram, with T = 1250°C and C0 = 65 wt% Cu, one phase is present.
Cooling and Microstructure
- During non-equilibrium (cored) cooling of a C0 = 35 wt% Ni alloy, microstructural changes occur due to incomplete diffusion, resulting in coring.
- During equilibrium cooling of a C0 = 35 wt% Ni alloy, the main mechanism that accomplishes the readjustments is diffusion.
Microstructure Analysis
- The photomicrograph of an as-cast bronze alloy found in Syria, dated to the 19th century BC, reveals a dendritic microstructure.
Cooling Rates and Microstructure
- In an isomorphous alloy, a slow rate of cooling results in a more homogeneous microstructure.
Role of Diffusion
- During equilibrium cooling of a C0 = 35 wt% Ni alloy, diffusion plays a crucial role in both solid and liquid phases, allowing for the readjustments of the microstructure.
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Description
Learn about binary phase diagrams in engineering materials, considering phase diagrams at a specified pressure (1 atm) with 2 independent variables: T and C and discussing isomorphous and eutectic binary systems.
