Grain refinement of undercooled single-phase Fe70Co30 alloys

✍ Scribed by Ning Liu; Feng Liu; Gencang Yang; Yuzeng Chen; Da Chen; Changlin Yang; Yaohe Zhou

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 701 KB
• Volume: 387
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2006.03.101

✦ Synopsis

The grain refinement mechanism of undercooled single-phase Fe 70 Co 30 alloy was investigated. With increasing the initial melt undercooling (DT), the first grain refinement occurs within 22 KoDTo87 K, and the second one if DT4183 K. Applying a dendrite break-up model (i.e. on the basis of morphological instability) in combination with the BCT model calculation, a theoretical description for the observed grain refinements is given. Both grain refinements are concluded to be caused by dendrite remelting. Good agreement between theoretical expectation and experimental result was found for the second grain refinement. As for the first grain refinement, only the initiating undercooling (i.e. DT ¼ 22 K) can be predicted using the above model, whereas large deviation remains for the ending undercooling (i.e. DT ¼ 87 K). This can be ascribed to the fact that the effect of solutal diffusion was deduced to be negligible for DT425 K in BCT model calculation.