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Journal of Materials Science

, Volume 42, Issue 8, pp 2862–2866 | Cite as

Analysis of observations on solid-solution hardening in KBr–KCl single crystals

  • Ali Asif
  • Muhammad Zakria ButtEmail author
Article

Abstract

Available data on the temperature and concentration dependences of the critical resolved shear stress (CRSS) of KBr–KCl solid-solution crystals containing 8–41 mol% KCl in the temperature range 77–230 K have been analysed within the frame work of the kink-pair nucleation model of plastic flow in solid-solution crystals. It is found that CRSS τ decreases with the increase in temperature T in accord with the model relation ln τ = ABT, where A and B are positive constants. The CRSS τ at a given temperature depends on solute concentration c as τ ∝ cp, where exponent p has a value between 0.5 and 1 depending on the temperature at which deformation is carried out. The model parameter Wo, i.e. binding energy between the edge-dislocation segment involved in the unit activation process and the solute atoms close to it (T→0 K), which is inversely proportional to B, increases with solute concentration c monotonically in accord with the model prediction Wo ∝ c1/4 upto a critical value cm = 35 mol% KCl. However, Wo decreases with increase in c beyond cm, which indicates somewhat ordered distribution of solute in the host lattice of concentrated solid-solutions with c > cm.

Keywords

Concentration Dependence Solute Atom Critical Resolve Shear Stress Kink Pair Excellent Linear Relationship 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

One of us (M.Z. Butt) is grateful to Pakistan Council for Science and Technology, Government of Pakistan, Islamabad for financial assistance under the Research Productivity Allowance Scheme

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Department of PhysicsGovernment College UniversityLahorePakistan

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