Conclusions
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1.
Direct visual observation of successive stages in the melting of thin strips of low-melting metals and alloys showed that melting always begins in the grain boundaries.
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2.
The slip of the grains with respect to each other along the liquid layer under the influence of their own weight results in a visible relief on the surface of the samples that reflects the size and shape of the grains.
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3.
The character of melting is affected by impurities, the surface film, the magnitude of the load, and the rate of heat flow to the sample.
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Literature cited
A. Ubbelode, Melting and Crystal Structure [Russian translation], Mir, Moscow (1969).
D. McLean, Grain Boundaries in Metals, Oxford Univ. Press, London (1957).
F. Weinberg, Acta Met., No. 5 (1957).
G. Chaudron et al., Compt. Rend., No. 226 (1948).
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 78–79, October, 1970.
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Ivlev, V.I., Mal'tseva, G.K. The melting of grain boundaries. Met Sci Heat Treat 12, 891–892 (1970). https://doi.org/10.1007/BF00654488
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DOI: https://doi.org/10.1007/BF00654488