2195 Alloy

Alloy name: 2195
Diagram No.: 716
Type of diagram: TTT
Chemical composition in weight %: 4% Cu, 1% Li, 0.3% Ag, 0.3% Mg, 0.1% Zr, balance is Al
Alloy group: Aluminium based alloys
Note: The stud_ of TTP behavior at higher temperature (400 to 1000 F) was prompted by the fact that the SLWT requires a welded construction. Heat conduction from the weld pool affects the microstructure in the heat-affected zone (HAZ), which leads to changes in the mechanical properties. Furthermore, the SLWT may need repair welding for more than one time and any additional thermal cycles will increase precipitate instability and promote phase transformation. As a result,._zonsiderable changes in HAZ microstructure and mechnaical properties are expected during the construction of the SLWT. Therefore, the TTP diagrams can serve to understand the thermal history of the alloy by analyzing the welded microstructure In the case welding, the effects of thermal Cycles on the microstructure and mechanical properties can be predicted with the aid of the TTP diagrams.
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