Effect of adsorption of alloying elements on the morphology of precipitates in Ni-Cr-Nb alloys
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T-T-T diagrams were plotted for Ni-Cr-Nb alloys (multicomponent commercial alloy 70NKhBMYu and the basic ternary alloy N70Kh20B9) that show the change in the morphology of second phases precipitated during aging.
The aging conditions were determined for obtaining a lamellar structure of discontinuous decomposition throughout the bulk of alloys 70NKhBMYu (930–900°C for 1–2 h) and N70Kh20B9 (880–750°C for 1–8 h).
The structure and morphology of second phases precipitated during aging of Ni-Cr-Nb alloys are affected by the character of adsorption of the element added.
The mechanism of the effect of aluminum, tungsten, and molybdenum in Ni-Cr-Nb alloys on the morphological sequence of precipitation of excess phases is correlated with the effect of these elements on the stability of dispersed phases and the surface energy of the interphase boundaries.
KeywordsPrecipitation Aluminum Tungsten Molybdenum Surface Energy
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- 1.J. Petermann, Z. Metallk.,62, No. 4, 324–325 (1971).Google Scholar
- 2.F. Carpay, J. Cryst. Growth,18, No. 2, 124–128 (1973).Google Scholar
- 3.J. Livingston, Sci. Met.,7, No. 4, 361–363 (1973).Google Scholar
- 4.S. A. Saltykov, Stereometric Metallography [in Russian], Metallurgiya, Moscow (1970).Google Scholar
- 5.G. A. Sveshnikova, "Ni-Cr alloys with niobium," Metal. i Term. Obrabotka Metal., No. 1, 29–34 (1966).Google Scholar
- 6.L. V. Barseg'yan, B. G. Belov, and S. N. Platova, "Investigation of mechanical and elastic properties of Ni-Cr-Nb alloys," in: Transactions of the Central Scientific-Research Institute of Ferrous Metallurgy [in Russian], No. 71 (1969), pp. 199–207.Google Scholar
- 7.B. Predel and M. Frebel, Acta Met.,20, No. 11, 1259–1268 (1972).Google Scholar
- 8.J. Petermann and E. Horbogen, Z. Metallk.,59, No. 10, 814–822 (1968).Google Scholar
- 9.V. I. Arkharov, "Effect of internal adsorption on aging processes in alloys and possible significance of this effect in heat resistance," in: Theory of Heat Resistance of Metallic Alloys [in Russian], Transactions of the Institute of Physical Metallurgy, Urals Branch, Academy of Sciences of the USSR, No. 19 (1958), pp. 153–162.Google Scholar
- 10.U. Malhotra and K. Rundman, Met. Trans.,3, No. 6, 1521–1528 (1972).Google Scholar
- 11.L. N. Larikov and O. A. Shmatko, "Mechanism and kinetics of decomposition of supersaturated solid solutions of tungsten in cobalt," Fiz. Metal. Metalloved.,30, No. 6, 1173–1181 (1970).Google Scholar
- 12.A. G. Rakhshtadt, Spring Steels and Alloys [in Russian], Metallurgiya, Moscow (1971).Google Scholar
- 13.Kh. G. Tkhagapsoev et al., "Structure and properties of beryllium bronze microalloyed with magnesium," Metal. i Term. Obrabotka Metal., No. 2, 19–24 (1970).Google Scholar
- 14.B. Predel and W. Gust, Mat. Sci. and Eng.,10, No. 4, 211–222 (1972).Google Scholar
- 15.S. N. Zadumkin et al., "Relationship between the generalized statistical moment of an atom of an element and the character of its adsorption in two-component systems in the solid state," Fiz. i Khim. Obrabotki Mat., No. 4, 132–138 (1970).Google Scholar
- 16.T. Rajan and M. Saxena, Univ. Roorkee Res. J.,10, Nos. 3–4, Part 5, 1–8 (1968).Google Scholar