An acid saw technique for cutting nickel single crystals
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Fig. 2 - - A v e r a g e s t r a i n r a t i o R v s R45 for v a r i o u s s t e e l a l l o y s (data f r o m Ref. 7). D a s h e d lines show 95 pct c o n f i d e n c e interval. i t y o f E q . [4] in o t h e r a l l o y s . Of p a r t i c u l a r i n t e r e s t would be those alloys which develop crystallographic t e x t u r e s s i m i l a r to t h o s e in a l u m i n u m a l l o y s . The author is grateful to the management of Kaiser Aluminum and Chemical Corporation, Center for Technology, for permission to publish these results. 1. R. L. Whiteley: MetalProgr., November 1968, vol. 94, pp. 81-84. 2. M_Atkinson and I. M. Maclean: Sheet Metal Ind., 1965, vol. 42, pp. 290-98. 3. L. Lilet: SheetMetatlnd., 1966, vol. 43, pp. 949-57. 4. R. L. Whiteley: Trans. ASM, 1960, vol. 52, pp. 154-63. 5. D. V. Wilson:J. Inst. Metals, 1966, vol. 94, pp. 84-93. 6. R. M Colton and G. J. Enyedy: Tech. Rep. AMRA TR65-15, 1965, U. S. Army Mater. Res. Agency, Watertown, Mass. 7. C. A. Stickels and P. R. Mould: Met. Trans., 1970, vol. 1, pp. 1303-12. 8. J. Moulin, J. Bonmarin, and J. Peyraud: Formage Traitments Metaux, 1969, vol. 3, pp. 27-42.
An Acid Saw Technique for Cutting Nickel Single Crystals JOHN KWADWO BOAH
specimen C O N V E Nmethods T I OofN A L preparation such as mechanical sawing and abrasive polishing introduce large amounts of deformation into metal single crystals.I Cutting techniques have been developed in an effort to produce deformation-free specimens. Acid cutting and electrodischarge machininghave been frequently mentioned in recent literature as being suitable JOHN KWADWO BOAH is with the School of Materials Science and Metallurgical Engineering, Purdue University, West Lafayette, Ind. 47906. Manuscript submitted December I, 1972. 1432-VOLUME4, MAY 1973
techn[ques for cutting metal single crystal specimens; however, work by Berry 2 has shown that some deformation is associated with electrodischarge machining due to the extremely steep temperature gradients that are established during the process. Youngand WilsonI have described an acid saw that can cut copper single crystals without introducing dislocations. These authors presented experimental evidence in the form of chemical etch pit studies to verify that the acid cutting process did not increase the dislocation density of copper single crystals. This communicationdescribes an acid sawing technique for cutting nickel single crystals. In this technique the crystal is heated to the temperature used in chemical polishing3 while being cut on a reciprocating stainless steel saw4 similar to the one used by Youngand Wilson. Cuts are smooth and under optimum conditions appear polished directly after sawing. The saw used in this work, Fig. 1, essentially consists of a 0.5 mm nichrome wire which moves back and forth over a pair of grooved rollers th
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