Tetsuyoshi Suzuki1,, Yoshihisa Kaneko2 and Satoshi Hashimoto2
1Ijima Kingin Kogyo Co., Ltd., Tsukuba 300-2646
A new white gold was fabricated by alloying iron and chromium to gold matrix. Au-Fe-Cr alloys of various chemical compositions were prepared by arc melting first in order to examine plastic workability, which was estimated by cold rolling and bending tests. The workability tended to increase at the alloys which had high Au and low Cr contents. With a view to confirming color tone which has been important for white golds, surface color of alloy was evaluated on the basis of Yxy and L*a*b* color spaces. It was recognized that the surface color of the Au-Fe-Cr alloy was almost identical to that of a conventional Au-Pd-Cu-Ag white gold. Tensile deformation properties of wiredrawn specimens were investigated at the alloys showing the high plastic workability. It was found that ultimate tensile strengths of some as-drawn Au-Fe-Cr alloys exceeded 1 GPa, which is comparable with the strength of an Au-Ni-Cu-Zn white gold. Au-14%Fe-1%Cr alloy exhibited the highest strength among the Au-Fe-Cr alloys tested in the present study.
(Received September 2, 2003)
white gold, gold-iron-Chromium alloy, mechanical property, tensile strength
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