INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
Prev
Next
|
|
|
What happens to the initial planar instability when the thermal gradient is increased during directional solidification? |
Wang Zhi-Jun(王志军), Wang Jin-Cheng(王锦程)†, Li Jun-Jie(李俊杰), Yang Gen-Cang(杨根仓), and Zhou Yao-He(周尧和) |
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China |
|
|
Abstract The positive thermal gradient is one of the most important parameters during directional solidification. The increase of the thermal gradient usually stabilizes the planar interface in the steady state analysis. However, in the initial transient range of planar instability, the thermal gradient presents complicated effects. Time-dependent analysis shows that the increase of the thermal gradient can enhance both the stabilizing effects and the destabilizing effects on a planar interface. The incubation time first decreases and then increases with the increase of the thermal gradient. Moreover, the initial average wavelength always increases with the thermal gradient increasing, contrary to the effect of the thermal gradient on the steady cellular/dendritic spacing. This reveals the types of spacing adjustment after planar instability.
|
Received: 20 January 2011
Revised: 15 June 2011
Accepted manuscript online:
|
PACS:
|
81.30.Fb
|
(Solidification)
|
|
47.20.Ib
|
(Instability of boundary layers; separation)
|
|
47.20.Ma
|
(Interfacial instabilities (e.g., Rayleigh-Taylor))
|
|
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51071128), the Program for New Century Excellent Talents in University (Grant No. NCET-09-0683), the Fund of State Key Laboratory of Solidification Processing in Northwestern Polytechnical University, China (Grant Nos. 17-TZ-2007, 03-TP-2008, and 24-TZ-2009), the National Basic Research Program of China (Grant No. 2011CB610401), and the China Postdoctoral Science Foundation (Grant No. 20110491689). |
Cite this article:
Wang Zhi-Jun(王志军), Wang Jin-Cheng(王锦程), Li Jun-Jie(李俊杰), Yang Gen-Cang(杨根仓), and Zhou Yao-He(周尧和) What happens to the initial planar instability when the thermal gradient is increased during directional solidification? 2011 Chin. Phys. B 20 108104
|
[1] |
Langer J S 1980 Rev. Mod. Phys. 52 1
|
[2] |
Somboonsuk K, Mason J T and Trivedi R 1984 Metall. Trans. A 15 967
|
[3] |
Billia B and Trivedi R 1993 Handbook of Crystal Growth (Amsterdam: Elsevier) Vol. 1 p. 899
|
[4] |
Boettinger W J, Coriell1 S R, Greer A L, Karma A, Kurz W, Rappaz M and Trivedi R 2000 Acta Mater. 48 43
|
[5] |
Wang Z J, Wang J C and Yang G C 2010 Chin. Phys. B 19 017305
|
[6] |
Georgelin M and Pocheau A 1998 Phys. Rev. E 57 3189
|
[7] |
Georgelin M and Pocheau A 1998 Eur. Phys. J. B 4 169
|
[8] |
Teng J, Liu S and Trivedi R 2009 Acta Mater. 57 3497
|
[9] |
Warren J A and Langer J S 1993 Phys. Rev. E 47 2702
|
[10] |
Huang W, Geng X and Zhou Y 1993 J. Cryst. Growth 134 105
|
[11] |
Ma D and Jie W 1996 Acta Phys. Sin. (Overseas Edition) 5 306
|
[12] |
Losert W, Shi B Q and Cummins H Z 1998 Proc. Natl. Acad. Sci. 95 431
|
[13] |
Wang Z J, Wang J C and Yang G C 2009 Appl. Phys. Lett. 94 061920
|
[14] |
Mullins W W and Sekerka R F 1964 J. Appl. Phys. 35 444
|
[15] |
Wang Z J, Wang J C and Yang G C 2008 Acta Phys. Sin. 57 1246 (in Chinese)
|
[16] |
Wang Z J, Wang J C and Yang G C 2009 Cryst. Res. Technol. 44 43
|
[17] |
Chen M W, Lan M, Yuan L, Wang Y Y, Wang Z D and Xu J J 2009 it Chin. Phys. B 18 1691
|
[18] |
Wang Z J, Wang J C and Yang G C 2009 Phys. Rev. E 80 052603
|
[19] |
Ding G L 1997 Morphological Characteristics and Transitions During the Solidification of Binary Alloys (Xi'an: Xi'an Northwestern Polytechnical University Press) (in Chinese)
|
No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
Altmetric
|
blogs
Facebook pages
Wikipedia page
Google+ users
|
Online attention
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
View more on Altmetrics
|
|
|