CONVECTION EFFECTS AND BANDING STRUCTURE FORMATION MECHANISM DURING DIRECTIONAL SOLIDIFICATION OF PERITECTIC ALLOYS I. Experimental Result

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1 Õ 47 Õ 3 Vol.47 No ½ Õ ACTA METALLURGICA SINICA Mar pp ± Æ µ «À I. Ý À ÈÇË 1,2) É 2) ÌÏÊ 1) Í Î 1) ÃÆÅ 1) ÂÄ 1) 1) Æ«º, Æ« ) Æ«Í ÝÖ Ý Ö Ü, Æ« Ê ÚÛ Ë Bridgman ÞÄ É ³ Î Fe Ni Î ÞÄ Þ Ô», 2 ÞÄ ³Î ÞÄ Ä ÒÞÂË À Ð. º G/V ÞÄ Ä, ³Î ÞÄ Ä ÄË¹Ä Ò, Ê ÞÂØ» ÅÏ ¾«. Ä ÐÊÞÄ È ÚÐ«Ç Ç Ä ³ Ä, Ä ÐÎ Ë Đ À. ¹Ä Ð Î Ç, Õ Î ³, ¹ÄÁ Í Ç Ä ³ Ä. Å ³Î, ÞÄ,,, ÒÞ ¾ TG111.4 ¼ A (2011) CONVECTION EFFECTS AND BANDING STRUCTURE FORMATION MECHANISM DURING DIRECTIONAL SOLIDIFICATION OF PERITECTIC ALLOYS I. Experimental Result LUO Liangshun 1,2), ZHANG Yumin 2), SU Yanqing 1), WANG Xin 1), GUO Jingjie 1), FU Hengzhi 1) 1) School of Materials Science and Engineering, Harbin Institute of Technology, Harbin ) National Key Laboratory of Science and Technology on Advanced Composites in Special Environment, Harbin Institute of Technology, Harbin Correspondent: LUO Liangshun, lecturer, Tel: (0451) , luols@hit.edu.cn Supported by National Natural Science Foundation of China (Nos and ) and National Science Foundation for Post doctoral Scientists of China (No ) Manuscript received , in revised form ABSTRACT Systematic directional solidification experiments were conducted to investigate the convection effects on the banding structure evolution and macrosegregation in nonfaceted non faceted model Fe Ni alloy using conventional resistance heating and induction heating Bridgman directional solidification methods in this paper. It was found that convection can induce severe axial and radial macrosegregation in the directionally solidified samples, and make the microstructures complex and make the steady state difficult to achieve. Axial macrosegregation was reflected in finite samples solidified from the beginning to the end of solidification with the transition from primary phase to peritectic phase. The primary peritectic transition depended on the alloy composition and convection strength. Radial macrosegregation reflected in the solute concentration poor in the center and rich in edge, and a primary peritectic transition also exist in the lateral directional from the sample to the edge. KEY WORDS peritectic alloy, directional solidification, convection, segregation, banding structure * Đ Ð Â Ë , Ð Â ÅØ Ê Ð Â Õ ¼± : , ³¼± : : Ø Ð, 1980 Ç, ÆÔ»µ, DOI: /SP.J

2 276 Ó Õ 47 ¹ Æ ß ßÃ, ¹ Ï ÑÏ Ti Al ÑÏ Nd Fe B Ì Y Ba Cu O Ñ [1 9]. Å µ ßÃÁ À Í ¹ º Đ ÝÆ Æ Ï Å Ñ Ñ. ±ÌÜ Á, ÔßÅ Þ Æ Ï, Ý Æ Ï Ó ßÅ Å Æ Ï ßà [1,10,11] : ÆÄ È Å ÓßÃ Æ ÆÂÀÈ ÙÓßÃ ß Ñ ÓßÃÌ È Å ÏßÃÑ, 1. ³ ÓßÃÌ ÙÓßÃ Æ Ï» G/V (G», V Ó) ßÅ 2 ßÃ, Sn Cd, Sn Sb, Zn Cu Ì Pb Bi Ï Æ Õ¼ [12 17], 1a Ì b. É Õ¼ [12 17] µæ, ß ÓßÃ, ¹ 1a Ç Ì±. É, Æ Ï ßÅ Å ³³ Ó, Æ Å Ì ºÅ. Á Æ Ï ßÅ Å Ì ßÃÙ, Ë ßÅ Í Æ ¾ ¹, Î Á ¹ ³Ë, É Đ Æ Ï Ó ßÅ Å ÓßÃÌ Ñ Æ Õ¼. Õ¼ [12 14], ßÅ Ó Ó, Æ «ĐÈ Î, ßÅ Å / Đ Æ Ï ÓßÃÌ Đ Á. Ë ³ ĺ ßÅ ÁÕ¼ ¹ Sn Cd Æ Ï Ó ßÅ ßÃÙ Á, Æ Äº ± 0.6 mm Î, Ø «Ñ Ô, ßÅ 1a ± ÓßÃ, Šĺ Î, Á, ßà ÆÈ, ĺ ßÅ º 6 mm Î, ÓßÃÇË ÙÓßà [12 14]. É, Æ Ï Ó ßÅ Å ÆÑ Á. ßÅ Bridgman, º ½Å Ä, ³ ÐÔ ºÅ», ËÅ Đ È Ï. É, Æ Õ¼ Đ Æ Ï ßÅ Å Óß ÃÌ Đ. Å ßÅ ÛÜ Ì 2, ÛÜ Î Æ Ø Đ, Å Î Î ÛÈ µ ¹Í Đ, Đ ÛÜ ¹. ½Ë 2 ßÅ Fe Ni Æ Ï ßÅ ßÕ¼, Å Õ¼ 2 ßÅ Æ Ï ßÅ Å Ó ßÃÌ Ñ, ÉÑÃÂÆÖ Á Ñ, ËÅ ßÅ Í Æ ¹ ÇÖ¼. 1» Fe Ni Ï Ã Ê ĐÆ Ù Ï. Fe 4.0Ni ( Ö Ý, %, ) Ì Fe 4.1Ni Ñ Æ Fe 4.3Ni Æ Fe 4.4Ni Ì Fe 4.5Ni Å Æ Ï ßÅ ß. Fe Ni Æ Ï ¾ 2. ±ÇÖ, 2 «Ù ½, ÀÈ δ α, Æ γ β. ß Å ß ß ÛÜ ßÅ Ì» ßÅ Â. ß ÛÜ ßÅ 3a. 2 ½ Õ Ta, ³ 2 Đ» / Đ» » [18].» ßÅ 3b, Í Æ, Ä. 2 ßÅ Å ßÃÙ, 2 ßÅ ß Ñ Ê, ĐÆ :» 1 ³Î Ò ÞÄ Û Ø Þ Fig.1 Schematic of various typical microstructures observed during the directional solidification of peritectic alloys (a) banding structure (b) oscillatory treelike structure with an insert showing one typical cross section (c) island banding (d) composite structure 2 Fe Ni ³Î ½ Fig.2 Relevant portion of Fe Ni peritectic phase diagram

3 Õ 3 Ï Ð : ²Í ÝÃ Ã Ë ÑÝÁ ÒÌ I. Ü Bridgman ÞÄ Fig.3 Schematic of two directional solidification systems with different heating method (a) resistance heating with two heating zone (b) induction heating Ó ßΠĺ Ñ. ß Å : Ë Î Ï ÜºÁÄ º 4.5 mm 100 mm Å,, ½  Đ, ƺ 5 mm Æ, ß ßÅ À Â, É 1650» 30 min, Å Åß ÓßÅ, À Û ÀÉ Ga In Sn Ï Ì. 2 ßÅ Ì ³,» ÊÎ, 2 ßÅ» ³. Fe Ni Ï, ß ÛÜ ßÅ» µ ß 12 K/mm [18], ßÅ» 30 K/mm. 2 ßÅ» Êų» Ê» Ä Á Æ, «2 ßÅ ±». É, Õ¼ Ý f s ( ßÅ ±ßÅ Ù À ) ßÃÙ Á, º ³ À Å. ßÅ Olympus GX71 µ Â, µ Ë Oberhofer Ïß Ï, ³ : 30 g FeCl g CuCl g SnCl ml HCl ml C 2 H 5 OH ml H 2 O. 2» ½ 5 Fe Ni Æ Ï ßÅ ß Á 1, ³» 8 K/mm ß Å ß ²Õ¼ [18] Á, Ð. Fe Ni Æ Ï ßÅ ½Ñ ÀÈ ÀÈ α, Å µå ßÃÅ Æ β È ÄÉ Û, ÚÆ Ï ß Å ÅÂÎ Ë α Å β Å (α/β ), 1 Ì 4. Fe Ni Æ Ï» G/V ßÅ Ù µ ÀÈ α È Å, ¹ Å α È À Å ÇÖ, Ú α Î È. Å Õ¼ [19], α È ± º, ÇÖ, ß fs α0 ßÅ À È α Í È Ý, ÀÈ α È. «4 Ì, ßÃÙ α O(α/β) β O(α/β), ÀÈ α, α È» 10 mm α, Æ β (ÙÓ) ßà O(α/β), O(α/β) È» 12.8 mm Æ β, Ú ½ β, β È 0.7 mm «O(α/β) ÄÉßÅ Û. ² ÀÈ α Í È Ý fs α0 =0.29, 4a Ì Fe Ni ² º ¹ Á 4a e Fe Ni Ï ß ÛÜ ßÅ Æ ßÃ. / Đ Ó ß Ô Â, Bridgman ßÅ ßß Å Ù, ³Á / Đ Á. Fe Ni Æ Ï ÛÜßÅ ßÃÙ Ñ ««. (1) ßÅ G/V Å ( K s/m 2 ), ÚÆ «ĐÈ Î, ½Æ Å Æ, Ú 5 Æ Ï ßÅ ¹ ß ßÃ. Ô Å, ßà ÆÈ, Fe 4.0Ni Ï 5 µm/s ßÅ 4 ÀÈ α ÌÆ β ÓßÃ; Fe 4.3Ni Ï 5 µm/s ßÅ 11 ßà O(α/β) ± Ïßà ßÃ; Fe 4.5Ni Ï 5 µm/s ßÅ 20 ³ ÆÈ ÙÓßà O(α/β), Ù ÈÈ,

4 278 Ó Õ 47 1 Fe Ni ³Î ÞÄ»ÜØÞ Table 1 Summary of the experiments and the structures of directionally solidified Fe Ni alloys Sample C 0 G V G/V f s f α0 s Macrostructure Heating No. % K/mm µm/s 10 9 K s/m 2 evolution method >0.50 α P ID >0.50 α P ID >0.50 α P ID α O(α/β) β O(α/β) RS α (α C)+β RS α β O(α/β) β ID α O(α/β) β P ID α (α C)+β α (α C)+β α (α C)+β ID α α IB β α β P ID α IB ID α O(α/β) PCG O(α/β) (α P)+PCG+ (β P) RS α O(α/β) α IB PCG β RS α O(α/β) (α C)+ β α IB α CPCG RS α O(α/β) β O(α/β) PCG O(α/β) PCG RS O(α/β) PCG O(α/β) PCG O(α/β) PCG O(α/β) PCG RS O(α/β) PCG O(α/β) PCG O(α/β) PCG O(α/β) α O(α/β) CPCG RS O(α/β) PCG β P ID O(α/β) PCG+ (β P)(fs α0 =0.368) ID O(α/β) β P ID α O(α/β) α IB PCG+(β P) RS α O(α/β) CPCG O(α/β) CPCG RS Note: C 0 initial composition, atomic fraction; G temperature gradient; V velocity; f s volume fraction of solidification; f α0 s volume fraction of primary α phase solidification; C cells; P plane; PCG peritectic coupled growth; CPCG cellular peritectic coupled growth; IB island banding; O(α/β) oscillatory structure between α and β; ID induction heating; RS resistance heating ³ Å β Å, 1 Ì 4a e. ßÅ G/V Å Ê, ÀÈ ««Ó È Î, Fe Ni Æ Ï ßÅ «ß ßÃ: Ó ÓÀÈ α Æ β Ñ Ïßà [20]. (2) «G/V ÅßÅ Î, Fe Ni Æ Ï ßÅ Å Ó Å. ÅÂ, Ô Å Z s, Ú Ý f s Å, ÀÈ α Ô Ý Å Ê, Æ β Ô Ý Å, Å β, Ú Fe Ni Æ Ï ß Å ÅÂÎ ÀÈ α È Æ β È Å, 4c Ì d. «Fe 4.3Ni Ï 5 µm/s ßÅ 12 Ì, Ë Û Ù : ÀÈ α ÙÓßà O(α/β) α / ß Ã ÈÈ PCG β, ÔßÅ, ÀÈ α Ô Ý Å Ê, Æ β Ô Ý Å, α ± ÇË Æ β, 4c. Ô Å, Ï Å», ÚÚ «β È Î ß β. ßÃÙÅ Fe Ni Æ Ï ßÅ Å ½ Æ, ¼ ³ Æ ß Å Ã Á [12,13], «Æ Ï α È ß β È α/β. Đ, α/β ± Óßà β α Đ Ê ½ β ³, α/β ÆÈ β ßÈ ÄÉ ± Û, ³ α. ßÆ, α/β Å ±Ï Ù Ý f s, Fe 4.3Ni Ï 5 µm/s ßÅ 12, α/β Ý 0.83, 4c. Fe 4.5Ni Ï 5 µm/s ßÅ 20 Á, Ë À ÛÌ, ½ßÃÙ± 12 à : ÀÈ α ÙÓßà O(α/β) α / ßà ÈÈ, ßÅ ÛÎùÆÈ α/β, «Á ÈÈ ³ ß, Ú ÆÈ α/β, 4d. 20 ßÅ ÛÎ Ý 0.61, Fe 4.5Ni Ï «5 µm/s ßÅ ÆÈ α/β Ý ĐÔ 0.61, Ê Fe 4.3Ni Ï Ô Ï, G/V, Fe Ni Ï Æ

5 q3$ sw l : & U y K :K B X i d S s myi \ > n T I. X x G 34 Fe Ni 279 'V zl ;\>zjtb Fig.4 Longitudinal sections of directionally solidified Fe Ni alloys showing the macrostructures evolution (a) specimen 4, Fe 4.0Ni, V =5 µm/s (b) specimen 11, Fe 4.3Ni, V =5 µm/s (c) specimen 12, Fe 4.3Ni, V =5 µm/s (d) specimen 20, Fe 4.5Ni, V =5 µm/s (e) specimen 21, Fe 4.5Ni, V =10 µm/s (f) specimen 6, Fe 4.1Ni, V =5 µm/s (g) specimen 7, Fe 4.1Ni, V =10 µm/s (h) specimen 8, Fe 4.1Ni, V =20 µm/s (i) specimen 17, Fe 4.4Ni, V =10 µm/s P α/β k k a < ye R, A%Or' 3 IeF k. (3) 8 Fe Ni W! { M <M D Z,? 4g. M{Kk?5,?;Ae #j~8.m MJV 8? 6 R. [ {, 8j ~ Z Y CW o Æ ^ α, 8j ~,CW / Æ ^ β, 8 α FT FZ < ^!5 k YF {K. Fe 4.3Ni W! {M <j~ 11 +T, j~zycw o, ^ af SZYM,e $rcw, ^ β Feo{K β IB Y F8 PP ; {K PCG, `M ga F β, E # 5. v { M < G/V M R gh P F α + o P ; V, A^. M k? 6 ~ e V 8 k. # 6 β 5 µm/s α,

6 280 Ó Õ 47 Fe 4.3Ni Ï 10 µm/s ßÅ 13 ßÅ ßÃ, «Ó α, β, Å ² α ÓßÃ. É, ºÅ ÅÂ, Fe Ni Æ Ï ßÅ Î ½Ë α Å β Å. (4) G/V, ÔÏ, ºÅ Å, Á Æ, Æ, 4a d, ± ÅÂ»Ï Á α/β Ê. (5) α ««Ó Î, Ú G/V Å ±ÀÈ α Đ ß ÅÎ, Fe 4.5Ni Ï ßÅ Å Æ Ï Ï ÓßÃ, «Ó α+ «β ÏßÃÌ α Ï ÓßÃ, 4e. ±Å «Ó α Ì β Ï Óßà ³, ³ ÓÍà ռ.» G/V ÅßÅ Ó Å̺ŠFe Ni Æ Ï ß ÛÜ ßÅ ßÅ Å Ï Î, ±Ç 5 Fe 4.3Ni Î Å 5 µm/s ÒÞÄ / Þ Fig.5 Longitudinal section of the quenched solid/liquid interface of directionally solidified Fe 4.3Ni alloy at V =5 µm/s (β (α) stand for β phase formed by α β solid phase transition) Ç Î. 2.2 Fe Ni ² º ¹ Á ßÅ ÐË, È ĐĐ Í Æ, Å ÄÅ, È, ËÅ / Đ È ¹ ¹Í Đ. ³ ßÎ, È ¹ Đ Í ß, ½ [21], Í 15 mm Î, È µ Ê. ß ß È È ß ¹, «Í 10 mm. Fe Ni Æ Ï, G/V Å, ÀÈ α ĐÈ Î, / Đ Ó Á, / Đ µ  Đ, Ó ³, Ô, Å, 7a. ßÅ G/V Å Ê, Ú Ó, ÀÈ α «Ó Î, / Đ Â µâ ± Đ, 7b, / Đ Á Ó Å Ê. Đ«½Ù ÌÖ Ï Û Ü ßÅ Ì ßÅ Å ßÃÙ. 8 Fe 4.4Ni Ï G/V «2 ³ ßÅ ßÃÌ / ĐßÃ, ³ 8a Ì c ÛÜ ßÅ, 8b Ì d ßÅ. ÛÜ ßÅ ÙÓßà O(α/β) Ì È Ïßà PCG ÓßÃ, Óßà ²Ù 2 ß Ã ³, 8a. Å ßÅ, Fe 4.4Ni Ï ßÃÙĐ, ÀÈ α µå Å ÙÓßà O(α/β) Å 6 Fe 4.3Ni Î Å 10 µm/s ÒÞÄ / Þ Fig.6 Longitudinal section (a) and cross section (b) of directionally solidified Fe 4.3Ni alloy at V =10 µm/s 7 Fe 4.1Ni Î ² ÒÞÄ / Þ Fig.7 Longitudinal section of the quenched solid/liquid interface of directionally solidified Fe 4.1Ni alloy at V =10 µm/s (a) and V =30 µm/s (b)

7 Õ 3 Ï Ð : ²Í ÝÃ Ã Ë ÑÝÁ ÒÌ I. Ü Fe 4.4Ni Î ÞÄ Ø / Þ Fig.8 Microstructures of directionally solidified Fe 4.4Ni alloy (a, c) resistance heating directional solidification, G=12 K/mm, V =6 µm/s (β (α) in Fig.8c stands for the β phase formed by subsequent α β solid phase transformation) (b, d) induction heating directional solidification, G=30 K/mm, V =15 µm/s PCG β ßÃ, ¼³ Å β, 8b Ì d. ¼, ³ Ó 17( 4i), ² Å β È. É, G/V, ÛÜ ßÅ Ì ßÅ ßÃ, Š̺ÅÂ. ßÅ À Á α, ¼«ÙÓßà O(α/β) Å, α Á Ï Ni Ñ, ÏÉ Å, «β Ô Ý Å, ± Å β. Å ÛÜ, Î Å, Đ Ê, α Å β Å Đ Û. ¹ ³ 2 ßÅ Fe Ni Ï ßÃÙÁ Đ, ßÅ Å ¹, Á Ï Ï ¾, ÏÉ Ð, Å β, ÅÛÜ ßÅ Î ¹ ĐÊ, ÏÉ Ö Û, «α/β Û. ±ÛÜ ß Á, Fe Ni Æ Ï ßÅ ßÃÙ «Ù. (1) ÛÜ ßÅ, Fe Ni Æ Ï ßÅ Å ßÃÙ. G/V Å»Î, Ü Æ Ï ± Óßà Óßà ÙÓßÃÌ ÈÈ ßÃ, Ñ G/V Å Î Ï ÓßÃ, Å Ó G/V ÅÎ ß «Ó ÀÈ Æ Ñ ÏßÃ, 1. (2) ßÅ Å ±ÛÜ ßÅ ³. Á³ ½Å Á, ÀÈ α È Ý Ð Å. ÀÈ α È Đ Ï Ö ÅÏĐ ÅÆÓ, ËÅÖ β ʱÈ. α È ¼, Đ Á Ï ÔÒ ¹Ä, ÉÎ ¹ ¼, ßÅ Å ¼Ó., α È ¼, Đ Ï Ö¼», ¼ ±Ç Ç, ¹ ¼Ê. ÌÛ Ü, Æ ± Ï Ì G/V, ºÅ ³Ó Î, ßÅ ÀÈ α fs α0 Đ ÛÜ ( 1), Đ ÛÜ ßÅ Å ¹, Å Đ Ó. ÀÈ α È ½ : Ï ÌÈ Å Ê, Ì ¾, ÛÜ 5 µm/s ßÅ Fe 4.5Ni Ï fs α0» Fe 4.0Ni Ì Fe 4.3Ni Ï, Fe 4.5Ni Ï ºÅ Ó µ. (3) ßÅ ºÅ ±ÛÜ ß Å ³. G/V ÅßÅ Î, ßÅ ºÅÂßÃÙ ÛÜ, Ä Á α/β ( 4g Ì i), ÅÜ ºÅ α/β Å ßÃ, Óßà ÈÈ ß ÃÑ. 2 ßÅ ºÅ ± ÅÂ, ºÅ α/β Ä, ßÅ Đ ¹, ºÅ Ï ÅÒ µ. (4) G/V Å Ê, α ««Ó È Î, ± È, ÌÛÜ ßÅ ßà ٠Ã. G/V Å Ê, ¹ ÆÓ, 2 ßÅ Ê µ. É, ßÅ Å «Ó α+ «β ßÃÌ α Ï Óß Ã ( 4h), ÛÜ ßÅ Å Ï Ï Óßà Á ³ ¾, Ï ßÃ, ÓÍà µõ¼. G/V, ³ Fe Ni Ï

8 282 Ó Õ 47 ßÅ Å ßÃÙÅ ±, 4g Ì i «, ÔÏ Fe 4.1Ni Fe 4.4Ni, Å̺ŠÑÑ Ê, Æ» Ni É Ï α/β, ±ÇÖ³ Ê. ßÆ Óßà ŠÊÅÄ, Fe 4.1Ni Ï ßÅ Å Óßà ß, ĐÄ, 9. Ë 9 «, α Đ β Ê β Î, α Ì β ĐÄ 3.87Ni Ì 4.41Ni, ± À Đ» Ì K, Á α ÊÅÄ 0.3 Ì 0.2 K. Đ, Óßà «, ÔßÅ, ßÅ Û, α Ì β ßÅ Å ÄÇ, ¼ β ± µ α ÆÈ Æ. 2 Ì ³ ¹, ß µ α/β б± Å β Ê, Ä»Î β ½ Ni É ÆÓ, Å α ½ Ni É É», µ¾ α ß β ÊÅÄ», ž β ß ÊÅÄ Ó. ¾ ÂØÆÖ, «ß Fe Ni Ï Óßà Šβ ÊÅÄ ² K À. Ô, ¾ α β Đ Ê ß α ÊÅÄ K À. Æ ÊÅÄ ß ÇÖÕ¼. ½ Á Ï Ý k 0 <1 Fe Ni Æ Ï, k 0 > 1 Æ Ï, Æ Ï ÆÈ. 9 Fe 4.1Ni Î ÒÞ ¾Þ Fig.9 Measured concentration distribution of the banding 3 structure observed in Fe 4.1Ni alloy (1) 5 Fe Ni Æ Ï ß ÛÜ ßÅ Ì» ßÅ ßÅ ß, Fe Ni Æ Ï 2 ßÅ ßÃÌß ßÃ, Óßà Óßà ÙÓßà ÈÈ ßÃÌ ß «Ó È È ßÃÑ. (2) 2 ßÅ, Fe Ni Ï ßÅ Å Å̺Å. 2 ßÅ, Õ Î Đ. Î Æ Ï» G/V ÅßÅ, ÚÀÈ α ĐßÅ Î «. (3) Fe Ni Æ Ï ßÅ Å Å Đ ßÅ À ÀÈ α, Å Á Å ßÃ, Óßà Óßà ÙÓßà ÏßÃ, Đ α Ô Ý Å Ê, β Ô Ý Å, Å ß β È. Ï Ì ³, α Å β Å ßÃÙ Ñ ¼. ±ÛÜ ßÅ, Õ ¹, α Å β Å, Å ÆßÃÙ ÆÓ. (4) Fe Ni Æ Ï ßÅ Å ºÅ Đ Ï ÀÈ α, Ö Ï Æ β(k 0 <1), α ± β À Î Å ßÃ. ßÅ ºÅ α Å β È Å Å, Ñ Ü Å ßÃ. Æ Ï 2 ß Å Å̺ŠÊ. ³ [1] Kerr H W, Kurz W. Int Mater Rev, 1996; 41: 129 [2] Johnson D R, Inui H, Yamaguchi M. Acta Mater, 1996; 44: 2523 [3] Lapin J, Klimova A, Velisek R, Kursa M. Scr Mater, 1997; 37: 85 [4] Zhong H, Li S M, Lu H Y, Liu L, Zou G R, Fu H Z. J Cryst Growth, 2008; 310: 3366 [5] Li S M, Ma B L, Lü H Y, Liu L, Fu H Z. Acta Metall Sin, 2005; 41: 411 (ÈÞ, Ù±Â, ÈÚ,, Ç. Ô, 2005; 41: 411) [6] Nagashio K, Takamura Y, Kuribayashi K. Scr Mater, 1999; 41: 1161 [7] Liu Y C. PhD Thesis, Northwestern Polytechnical University, Xi an, 2000 (. ºÕ¼,, 2000) [8] Wang M. PhD Thesis, Northwestern Polytechnical University, Xi an, 2002 (² Þ. ºÕ¼,, 2002) [9] Fu H Z, Su Y Q, Guo J J, Xu D M. Acta Metall Sin, 2002; 38: 9 ( Ç, Û,, Ï. Ô, 2002; 38: 9) [10] Dobler S, Lo T S, Plapp M, Karma A, Kurz W. Acta Mater, 2004; 52: 2795 [11] Su Y Q, Luo L S, Li X Z, Guo J J, Yang H M, Fu H Z. Appl Phys Lett, 2006; 89: [12] Trivedi R. Metall Trans, 1995; 26A: 1583

9 Õ 3 Ï Ð : ²Í ÝÃ Ã Ë ÑÝÁ ÒÌ I. Ü 283 [13] Liu S, Trivedi R. Metall Trans, 2006; 37A: 3293 [14] Trivedi R, Shin J H. Mater Sci Eng, 2005; A413: 288 [15] Li X Z, Guo J J, Su Y Q, Wu S P, Fu H Z. Acta Metall Sin, 2005; 41: 593 (ÈÎ,, Û,, Ç. Ô, 2005; 41: 593) [16] Guo J J, Li X Z, Su Y Q, Wu S P, Fu H Z. Acta Metall Sin, 2005; 41: 599 (, ÈÎ, Û,, Ç. Ô, 2005; 41: 599) [17] Li S M, Liu L, Li X L, Fu H Z. Acta Metall Sin, 2004; 40: 20 (ÈÞ,, ÈÈÉ, Ç. Ô, 2004; 40: 20) [18] Luo L S. PhD Thesis, Harbin Institute of Technology, 2008 (Ø Ð. Ç ºÕ¼, 2008) [19] Karma A, Rappel W J, Fuh B C, Trivedi R. Metall Trans, 1998; 29A: 1457 [20] Luo L S, Su Y Q, Guo J J, Li X Z, Yang H M, Fu H Z. Appl Phys Lett, 2008; 92: [21] Xu X. Master Dissertation, Northwestern Polytechnical University, Xi an, 2005 (. Đ ºÕ¼,, 2005)

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