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Correlation between microstructure of Ag-Pd-Au-Cu alloy and changes in shape on aging
Journal of Biomedical Materials Research
|July 1, 1984
Summary
Aging plastic deformed Ag-Pd-Au-Cu alloys at low temperatures minimizes shape changes. Inhibiting nodular growth is key for hardening these silver-rich alloys.
Area of Science:
- Materials Science
- Metallurgy
- Physical Chemistry
Background:
- Plastic deformation of Ag-Pd-Au-Cu alloys can induce microstructural changes during aging.
- Understanding shape changes is crucial for controlling alloy properties after heat treatment.
Purpose of the Study:
- To investigate the relationship between aging heat treatments and shape changes in plastic deformed Ag-Pd-Au-Cu alloys.
- To analyze microstructural evolution and its correlation with shape alteration during aging.
Main Methods:
- Quantitative analysis of shape changes using a feature analysis system.
- Microstructural observation to identify phase formation and nodular growth.
- Controlled aging heat treatments at various temperatures (573 K to 773 K).
Main Results:
- Shape changes, interpreted as volume shrinkage due to ordered phase formation, were smaller below 673 K.
- Microstructural changes varied between 573 K and 773 K, influenced by nodule nucleation at grain boundaries.
- Nodular growth preceded ordered phase formation and contributed to distinct volume shrinkage mechanisms.
Conclusions:
- Low-temperature aging (below 673 K) is recommended to minimize shape changes in these alloys.
- Inhibiting nodular growth during aging is essential for maximizing hardening in silver-rich Ag-Pd-Au-Cu alloys.