PRINCIPLES OF SOLUTION HARDENING. TECHNICAL REPORT NO. 12 Page: 8 of 80
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amount of a single element is not a specific value but varies markedly with the
temperature, Apparently, at two different temperatures a single element can
act in two entirely different ways to cause solution hardening. This complication
will be discussed more fully in a later section,
Data for some solid solution nickel alloys have been reported by Zackay and
Hazlett l9> other unpublished data by the present authors on nickel alloys have
also been included in the following figures0 Fig 21 shows the changes in lattice
parameter associated with additions of various elements to nickel. Stress-strain
curves for these alloys are shown in Figs. 22 through 31:, and a cross plot of
flow stress vs. temperature is shown in Figs. 32 and 33. The relationships between
the room temperature flow stress and the atomic per cent alloy addition are
shown for the various alloys in Fig. 3h; a plot of the increase in flow stress vs,
the lattice parameter change is presented in Fig. 35, Values for nickel-titanium
have also been included for comparison.
Results on copper base solid solutions reported by Allen, Schofield, and
Tate(20) are also of interest. They found that 8.78% Zn, h,26% Ga, 2.95% Ge,
and 2.12% As produced the same change in the stress-strain curve as shown in Fig. 36.
In each of these alloys, the electron concentration was 1.087 so they concluded,
",..high charges in some way are the cause of the increased resistance to
plastic flow," Even though they neglected the size factor, their correlation
was unusually good, as is indicated by Fig. 37, It appears that solution harden-
ing cannot be ascribed simply to the lattice strains or electronic changes
introduced by randomly distributed solute atoms, In the following section, the
various theories of solution hardening will be presented and discussed in
relation to the available data,
MECHANISMS OF SOLUTION HARDENING
Until rather recently, solution hardening has been thought to be due to the
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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/m1/8/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.