Onset of local ordering in some copper-based alloys: critical solute concentration vis-a-vis various solutionhardening parameters

• Authors: Muhammad Butt , Mozina Noshi , Farooq Bashir
• Languages of publication: EN

Abstracts

EN

The mode of planar distribution of solute atoms in Cu single crystals alloyed with 0.5 to 8.0 at.%Ge has been investigated via the temperature dependence of the critical resolved shear stress of these alloys. It is found that there exists a critical solute concentration c
m ≈ 5 at.%Ge below which the distribution of solute atoms in the crystal is random, and above which some local ordering occurs. This together with such data available in the literature for Cu-Zn, Cu-Al and Cu-Mn alloys, i.e. c
m ≈7 at. %Zn, 7 at.%Al and 1 at.%Mn, when examined as a function of the size-misfit factor δ = (1/b)(db/dc)of a given binary alloy system, shows that the value of c
m strongly depends on δ; the smaller the magnitude of δ, the greater the value of c
m and vice versa. Also, the value of c
m is found to correlate well with the electron-to-atom ratio (e/a)of the Cu-Zn, Cu-Al, Cu-Ge and Cu-Mn alloys with the solute concentration c = c
m. However, no systematic correlation exists between the critical solute concentration c
m for the onset of local ordering and the modulus-mismatch parameter η = (1/G)(dG/dc).

Keywords

EN

copper alloys; yield stress; temperature dependence; composition fluctuations; local order

Discipline

• 61.72.Hh: Indirect evidence of dislocations and other defects (resistivity, slip, creep, strains, internal friction, EPR, NMR, etc.)
• 81.40.Cd: Solid solution hardening, precipitation hardening, and dispersion hardening; aging(see also 64.75.Nx Phase separation and segregation in solid solutions)

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2008
• Volume: 6
• Issue: 4
• Pages: 834-842

Dates

published

1 - 12 - 2008

online

27 - 9 - 2008

Contributors

author

Muhammad Butt

• Department of Physics, University of Engineering and Technology, Lahore-, 54890, Pakistan

author

Mozina Noshi

• Department of Physics, University of Engineering and Technology, Lahore-, 54890, Pakistan

author

Farooq Bashir

• Central Research Laboratory, Lahore College for Women University, Lahore-, 54000, Pakistan

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Identifiers

DOI

10.2478/s11534-008-0111-4