PRINCIPLES OF SOLUTION HARDENING. TECHNICAL REPORT NO. 12 Page: 6 of 80
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of silver on the critical shear stress of mercury crystals. However such large
effects due to minute additions are rare0
Data reported in the literature show that in general the effect of alloying
in the solid solution range is to increase the rate of work hardening over
that observed for the pure metal, However, certain results are at variance
with this observation0 When zinc is added to .admium, the rate of strain
hardening is lowered. 0 Similar results were also found for copper crystals
containing zinc ( The cause of the observed differences in behavior is unknown,
but it is obvious even from such preliminary observations that solution hardening
is not a simple phenomenon0
Systematic investigations of solution hardening have been made by a number
of people0 In 1922, Goebels(6) reported the change in Brinell hardness caused
by various additions of Bi, Sn, Hg, and Cd to lead0 The following year, Norbury(7'8)
reported the effects of Ag, Si, Mn, Al, Ni, and Zn on the hardness of copper0
It was obvious from this early work that the elements causing the greatest change
in the parent metal lattice produce the largest change in hardness, However,
the increase in hardness was not uniquely determined by the change in atomic
volume0 The scatter of data obtained when the change in hardness is plotted
against the change in lattice parameter is shown in Figs. 3 and h. Data taken
from the work of Frye and Hume=Rothery(9) are shown in Fig. 3 where the ultimate
Meyer hardness is plotted against the square of the change in lattice. parameter
produced by the addition of various elements to silver0 The data in Fig. h, .
taken from the work of Brick, Martin, and Angier(10) show the scatter of results
obtained when the change in Vickers hardness is plotted against the lattice
parameter change for one atomic per cent of various elements added to copper0 In
a 'similar investigation on copper a~loys, French and Hibbard(11)measured the
effects of various elements on the yield strength (stress at a strain of 0.01)
and lattice parameter0 Their results are reproduced in Figs0 5 and 6.
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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/m1/6/?rotate=270: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.