Studies on the β-ε Transformation in Cobalt-Nickel Alloys. I : Propagation Process of the Transformation

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The propagation of the diffusionless transformation of the f.c.c. structure (β) into the h.c.p. structure (ε) in cobalt-nickel alloys was microscopically investigated. As the transformation proceeds, many narrow relief markings such as slip lines appeared in parallel to the {111}_β in flat free surface of the alloy. The cross section of each marking was a ridge or a valley with almost definite slopes on both sides but not symmetrical, and their inclinations were always less than 20°; its width was about 1〜2μ. In pure cobalt, however, no marking was observable. The rate of growth of an ε crystal was less than ten-thousandth of that of a "Umklapp" martensite in steel, and these transformation processes are very resemble, when viewed from the growth rate, habit plane and structure of relief marking, to the "Schiebung" type of martensite in steel.
東北大学の論文