PRINCIPLES OF SOLUTION HARDENING. TECHNICAL REPORT NO. 12 Page: 7 of 80

The effects of alloying elements on the strength of binary ferrites have
(12) (13)(1)4) (
been reported by Bain(12), Austin( '3 , Lacy;and Gensamer ( , and by Gensamer 5
These data again confirm the conclusion that the change in lattice parameter is
not the sole factor affecting solution hardening.
Dorn, Pietrokowsky. and Tietz(16)have suggested that the second factor influeno=
ing solution hardening is the difference in valence between the solute and solvent
metals0 When they plotted the flow stress for various aluinrfnum alloys against
an empirical parameter, including changes in lattice parameter and difference in
valence 49o 2 / o aa + 1 5A V J + 700 o I /1 h v / } they obtained a single curve
correlating the behavior of all alloys tested0 (This correlation however, was based
upon the assumption that each aluminum atom has only two free electrons) The data
shown in Fig0 7 were taken from their work, Appreciation of the electronic
contribution to solution hardening is certainly a step forward, but inclusion of
a valence term is not sufficient to explain the complex behavior of solid solution
alloys0
The contributions by Dorn, Pietrokowsky, and Tietz(16) and by Sherby9 Anderson
and Dorn(17) have been invaluable additions to the literature0 These investigators
reported the results of extensive and precise work on the influence of alloying
elements on the plastic properties of aluminum0 Fig0 8 shows the changes found
(18)
in the lattice constant of aluminum produced by various alloy additions.
With the grain size maintained substantially constant these investigators
obtained the stress-strain curves shown in Figs0 9, 109 119 12, 13 & 1). They
found that the effect of each of the alloying elements could be reduced to an
equivalent amount of copper9 as shown in Fig, 150
Stress-strain curves were determined at various temperatures ranging from
780K to 7500K for each alloy0 The effect of temperature on the flow stress
(stress at 0.05 strain) are shown in Figs0 169 179 189 19, and 20, From these
data9 it immediately becomes evident that solution hardening produced by a given

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Parker, E.R. & Hazlett, T.H. PRINCIPLES OF SOLUTION HARDENING. TECHNICAL REPORT NO. 12, report, October 1, 1953; United States. (https://digital.library.unt.edu/ark:/67531/metadc1024439/m1/7/ocr/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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