Abstract
The light-figure phenomenon has been observed with single crystals of nickel-copper alloys containing 20∼80 percent copper, etched with various reagents, and information regarding the crystal planes developed by etching and the suitability of light figures to the orientation determination have been obtained. Etching with boiling saturated aqueous solution of ferric chloride produces distinct light figures, suitable for the orientation determination, for all of alloy crystals, while any other reagent reveals only indistinct or no light figure. The crystal planes developed by etching with ferric chloride solution are, beside the {lm0} (l⁄m<1.5) and nearly {111} planes commonly developed in all alloy crystals, the {610} and {811} planes in 20%Cu crystals, locally the {610} and {811} planes and locally the {510} planes in 30%Cu crystals, the {510} planes in 40∼70%Cu crystals, and the {310} planes in 80%Cu crystals, indicating that crystal planes of lower indices may be developed in alloy crystals of higher copper content.
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