Tensile strength of thermomechanically processed Cu-9Ni-6Sn alloys |
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Authors: | Jae Chul Rhu Sang Shik Kim Yun Chul Jung Seung Zeon Han Chang Joo Kim |
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Affiliation: | (1) the Division of Materials Science and Engineering, Gyeongsang National University, RECAPT, Chinju, Korea;(2) the Materials Engineering Department, Korea Institute of Machinery and Materials, Changwon, Korea |
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Abstract: | The tensile properties of Cu-9Ni-6Sn alloys with different swaging amounts of 64, 77, and 95 pct, either solutionized and
aged (S/A) or directly aged (D/A), were examined as a function of aging time. It was found that the aging response of Cu-9Ni-6Sn
alloys varied greatly depending on the prior solution heat treatment before aging and/or different swaging amounts. The swaged
S/A Cu-9Ni-6Sn alloys showed a multistage increase in tensile strength with respect to aging time, probably due to the sequential
occurrence of spinodal decomposition, formation of metastable γ· precipitates, and recrystallization. The effect of different swaging amounts, ranging from 64 to 95 pct, was minimal on
the aging response of S/A specimens. The prior cold working, however, appeared to favor the spinodal strengthening, comparing
unswaged and swaged S/A Cu-9Ni-6Sn alloys. In 95 pct swaged D/A Cu-9Ni-6Sn alloys, the level of hardening was much less sensitive
to aging time. A complex interaction between the reduction in dislocation density, the formation of equilibrium precipitates,
and the reduction of Sn content in the Sn-rich segregates during an aging process is believed to be responsible for such a
lean sensitivity. The increases in tensile strength of 64 and 77 pct swaged D/A Cu-9Ni-6Sn alloys were found to be much steeper
than that in the 95 pct counterparts in the early and intermediate stages of aging, which is believed to be related to the
relative contribution from work hardening and precipitation hardening to the strength level of D/A specimens. |
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