MICROSTRUCTURE EVOLUTION OF DIRECTIONALLY SOLIDIFIED Al－12%Ni HYPEREUTECTIC ALLOY

PENG Peng; LI Xinzhong; LIU Dongmei; SU Yanqing; GUO Jingjie; FU Hengzhi

doi:10.3724/SP.J.1037.2012.00549

Acta Metall Sin >

2013 , Vol. 49 >Issue 3: 311 - 319

DOI: https://doi.org/10.3724/SP.J.1037.2012.00549

MICROSTRUCTURE EVOLUTION OF DIRECTIONALLY SOLIDIFIED Al－12%Ni HYPEREUTECTIC ALLOY

PENG Peng ,
LI Xinzhong ,
LIU Dongmei ,
SU Yanqing ,
GUO Jingjie ,
FU Hengzhi

Expand

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001

Received date: 2012-09-14

Revised date: 2012-12-04

Online published: 2013-03-11

Fold

Abstract

The Al－12%Ni (mass fraction) hypereutectic alloy from pure Ni and Al (99.9%) was induction melted and directionally solidified at constant growth rates ranging from 1 μm/s to 100 μm/s and abrupt change of growth rate were carried out in a Bridgman－type furnace. After solidification, the samples were quickly quenched into liquid Ga－In－Sn alloy to preserve the microstructure. The microstructures of the samples were observed using OM and SEM. It was indicated that at a growth rate of 1 μm/s, after experiencing a certain growth distance, the primary Al₃Ni phase disappeared and the coupled growth of eutectic could be obtained. The morphology of Al₃Ni phase was faceted when it was the leading phase at growth rates from 2 μm/s to 100 μm/s. The result of experiments with abrupt change of growth rate indicate that the initial microstructure before abrupt change of growth rate determine the microstructure after abrupt change of growth rate. Only if there existed no coarse primary Al₃Ni phase before abrupt change of growth rate could entirely coupled eutectic structure be obtained at relatively higher growth rates. After abrupt change of growth rate, the growth of primary Al₃Ni phase was suppressed and the coupled eutectic could grow continuously without any coarse primary phases. The strength and plasticity could be improved effectively through directional solidification.Besides, the elongation of Al－12%Ni alloy could be greatly improved by the abrupt change of growth rate during directional solidification.

Key words： eutectic alloy; directional solidification; microstructure evolution; solidification mechanism

Cite this article

PENG Peng , LI Xinzhong , LIU Dongmei , SU Yanqing , GUO Jingjie , FU Hengzhi . MICROSTRUCTURE EVOLUTION OF DIRECTIONALLY SOLIDIFIED Al－12%Ni HYPEREUTECTIC ALLOY[J]. Acta Metall Sin, 2013 , 49(3) : 311 -319 . DOI: 10.3724/SP.J.1037.2012.00549

References

[1] Shankar S, Riddle Y W, Makhlouf M M.Acta Mater, 2004; 52: 4447

[2] Kurz W, Fisher D J.Int Mater Rev, 1979; 5: 177

[3] Kurz W, Fisher D J.Fundamental of Solidification. 6th Ed., Switzerland: Trans Tech Publication, 1998: 180

[4] Qu S Y, Wang R M, Han Y F.Mater Rev, 2002; 16(4): 31

(曲士昱, 王荣明, 韩雅芳. 材料导报, 2002; 16(4): 31)

[5] Gao W, Li Z W, Wu Z, Li S A, He Y D.Intermetallics, 2002; 10: 263

[6] Meng J, Jia C C, He Q.J Alloy Compds, 2006; 421: 200

[7] Ren Z M, Li X, Wang H.Mater Lett, 2004; 58: 3405

[8] Zheng L L, Larson D J, Zhang H.J Cryst Growth, 2000; 209: 110

[9] Li S M, Song Y P, Ma B L, Tang L, Fu H Z.Mater Sci Eng, 2008; A475: 117

[10] Li S M, Quan Q R, Li X L, Fu H Z.J Cryst Growth, 2011; 314: 279

[11] Li S M, Ma B L, Li X L, Liu L, Fu H Z.Sci China E, 2005; 35: 479

(李双明, 马伯乐, 李晓历, 刘林, 傅恒志. 中国科学 E辑, 2005; 35: 479)

[12] Li S M, Jiang B L, Ma B L, Liu L, Fu H Z.J Aero Mater, 2005; 26(3): 35

(李双明, 蒋冰轮, 马伯乐, 刘林, 傅恒志. 航空材料学报, 2005; 26(3): 35)

[13] Tang L, Ai T T, Feng X M, Li S M.Cast Forg Weld, 2009; 38(1): 19

(唐玲, 艾桃桃, 冯小明, 李双明. 金属铸锻焊技术, 2009; 38(1): 19)

[14] Li S M, Song Y P, Ma B L, Tang L, Fu H Z.Mater Sci Eng, 2008; A475: 117

[15] Li S M, Quan Q R, Li X L, Fu H Z.J Cryst Growth, 2011; 314: 279

[16] Liu D M, Li X Z, Su Y Q, Luo L S, Guo J J, Fu H Z.Intermetallics, 2012; 26: 131

[17] Jones H.Mater Sci Eng, 2005; A413－414: 165

[18] Mertinger V, Szabo G, Barczy P, Kovacs A, Czel G.Mater Sci Forum, 1996; 215－216: 331

[19] Juarez－Hernandez A, Jones H.Scr Mater, 1998; 38: 729

[20] Nguyen Thi H, Drevet B, Debierre J M, Camel D, Dabo Y, Billia B.J Cryst Growth, 2003; 253: 539

[21] Burden M H, Hunt J D.J Cryst Growth, 1974; 22: 109

[22] Jackson K A.J Cryst Growth, 1968; 3－4: 507

[23] Liu D M.PhD Dissertation, Harbin Institute of Technology, 2012

(刘冬梅. 哈尔滨工业大学博士论文, 2012)

[24] Tiller W A, Jackson K A, Rutter J W, Chalmers B.Acta Metall, 1953; 1: 428

[25] Smith V G, Tiller W A, Rutter J W.J Phys, 1955; 33: 723

[26] Hu H Q.Fundamentals of Alloy Solidification. Beijing: China Machine Press, 1991: 251

(胡汉起. 金属凝固原理. 北京: 机械工业出版社, 1991: 251)

Options

Outlines

模态框（Modal）标题

Abstract

Cite this article

References