Grain refinement in undercooled nickel
作者： K.K. Leung , C.P. Chiu , H.W. Kui
DOI: 10.1016/0956-716X(94)00029-H
关键词: Metallurgy 、 Scanning electron microscope 、 Grain size 、 Microstructure 、 Nickel 、 Optical microscope 、 Materials science 、 Supercooling 、 Crystallization 、 Nucleation
摘要: In this paper, the microstructures of undercooled Ni that solidified at various initial bulk undercoolings are examined in detail order to understand mechanism grain refinement metallic systems. Molten contracts on solidification. experiment, since it was covered by molten glass flux, upon crystallization cavities had form accommodate rapid volume change if specimen remained contact with which could not flow so readily. The adhesiveness between and flux confirmed removing them from a furnace after whole system been cooled down room temperature. Furthermore, clear micrographs cavity formed, did collapse. It can therefore be concluded smaller grains found concentrate near void along minor axis. At still higher undercoolings, effect violent voids took irregular shapes. Again, somewhat than those further away. Accordingly, authors conclude brought about dynamic nucleation as formed.
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sci-hub.se 参考文章(8)
R. Willnecker, D. M. Herlach, B. Feuerbacher, Evidence of nonequilibrium processes in rapid solidification of undercooled metals Physical Review Letters. ,vol. 62, pp. 2707- 2710 ,(1989) , 10.1103/PHYSREVLETT.62.2707
Bruce Chalmers, Principles of Solidification ,(1964)
R. Willnecker, D. M. Herlach, B. Feuerbacher, Grain refinement induced by a critical crystal growth velocity in undercooled melts Applied Physics Letters. ,vol. 56, pp. 324- 326 ,(1990) , 10.1063/1.103289
K. K. Leung, H. W. Kui, Microstructures of undercooled Si Journal of Applied Physics. ,vol. 75, pp. 1216- 1218 ,(1994) , 10.1063/1.356458
H. W. Kui, A. L. Greer, D. Turnbull, Formation of bulk metallic glass by fluxing Applied Physics Letters. ,vol. 45, pp. 615- 616 ,(1984) , 10.1063/1.95330
C.F. Lau, H.W. Kui, Microstructures of undercooled germanium Acta Metallurgica Et Materialia. ,vol. 39, pp. 323- 327 ,(1991) , 10.1016/0956-7151(91)90311-N
C.F. Lau, H.W. Kui, On the dendrites and dendritic transitions in undercooled germanium Acta Metallurgica Et Materialia. ,vol. 41, pp. 1999- 2005 ,(1993) , 10.1016/0956-7151(93)90370-8
C.F. Lau, H.W. Kui, On the growth of 〈110〉 twin dendrites in undercooled Ge Acta Metallurgica Et Materialia. ,vol. 42, pp. 3811- 3816 ,(1994) , 10.1016/0956-7151(94)90446-4