Kinetics of cellular dissolution in a Cu-Cd alloy

Journal Article · Sat Jul 01 00:00:00 EDT 1989 · Acta Metallurgica; (USA)

DOI:https://doi.org/10.1016/0001-6160(89)90075-8· OSTI ID:7156463

Nakkalil, R; Gupta, S P ^[1]

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1. Dept. of Metallurgical Engineering, Indian Institute of Technology, Kanpur (IN)

Dissolution of the cellular precipitate by cell boundary migration has been studied in a Cu-2 at.% Cd alloy in the temperature range 777--878 K. Microstructural observations have revealed that the process of dissolution begins at the original position of the grain boundary as well as the cell boundary. The steady state rate of cell boundary migration decreased with decreasing temperature of dissolution and became zero at approximately 770 K, which is about 30 K below the equilibrium solves temperature. The boundary diffusivities were determined at a number of temperatures by using the theory of Petermann and Hornbogen modified for dissolution. The diffusivity values calculated from the experimental data are seven orders of magnitude higher than the corresponding volume diffusivities. From the temperature dependence of the diffusivity, an activation energy of 157 kJ mol{sup {minus} 1} is obtained, which is bout three-quarters of the activation energy for the bulk diffusion of Cd into Cu. From the diffusivity and activation energy values, it is concluded that the diffusion of Cd along the migrating grain boundaries control the dissolution of the cellular precipitate in this alloy.

• OSTI ID: 7156463
• Journal Information: Acta Metallurgica; (USA), Vol. 37:7; ISSN 0001-6160
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
74 ATOMIC AND MOLECULAR PHYSICS
CADMIUM ALLOYS
MICROSTRUCTURE
COPPER ALLOYS
ACTIVATION ENERGY
CADMIUM
DISSOLUTION
GRAIN BOUNDARIES
TEMPERATURE DEPENDENCE
ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
ENERGY
METALS
360102* - Metals & Alloys- Structure & Phase Studies
640302 - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory