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Hall-Petch Basis for Assessing Alloy Strengthening

Published online by Cambridge University Press:  15 February 2011

Ronald W. Armstrong  and
R. Michael Douthwaite
Ronald W. Armstrong
Affiliation:
Department of Mechanical Engineering, University of Maryland,College Park, MD 20742
R. Michael Douthwaite
Affiliation:
Materials Division, University of Newcastle Upon Tyne, NEl 7RU, Great Britain
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Abstract

The Hall-Petch relation σ = σo + kl−½, provides for the separate consideration of friction stress strengthening within the polycrystal grain volumes through σo and grain boundary strengthening through the product of the microstructural stress intensity k and the reciprocal square root of the grain diameter l Smaller grain diameters are normally obtained at higher alloy contents as illustrated for yield strength results reported for different face-centered-cubic Al-Mg alloys. Results on Al-Li alloy give an interesting example of substantial grain boundary strengthening that is associated with reduced ductility of the material. More complete results reported for the Cu-Al system, allow an evaluation of the strengthening component dependencies on alloy composition, in particular, connecting with a predicted square root of grain boundary obstacle stress in k. The much studied Cu-Zn alloys bring out subtle changes in σo and k

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 362: Symposium J – Grain-Size and Mechanical Properties--Fundamentals and Applications , 1994 , 41
Copyright
Copyright © Materials Research Society 1995

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References

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