三元Co-Cu-Pb偏晶合金的快速凝固组织形成规律研究

闫娜; 王伟丽; 代富平; 魏炳波

doi:10.7498/aps.60.036402

摘要

在自由落体条件下实现了三元Co-Cu-Pb合金的液相分离与快速凝固. 实验发现,随液滴直径减小,Co51Cu47Pb2合金液滴发生由枝晶→两层壳核→枝晶组织的转变,Co47Cu44Pb9合金液滴的组织形态由壳核组织演化为均匀组织. 两种合金的快速凝固组织均由α(Co),(Cu)和(Pb)固溶体三相组成,α(Co)和(Cu)相主要以枝晶方式生长,(Pb)相分布在(Cu)枝晶间.

关键词:

The metastable phase separation and rapid solidification of ternary Co-Cu-Pb monotectic alloys have been investigated under free fall condition. With the decrease of droplet diameter, the microstructures of Co51Cu47Pb2 and Co47Cu44Pb9 alloys display a "dendrite→core-shell→dendrite" transformation and a morphology transition from core-shell to homogeneous microstructure, respectively. X-ray diffraction analysis indicates that the solidified microstructures are composed of α(Co), (Cu) and (Pb) phases. α(Co) and (Cu) phases grow mainly in dendritic manner, and (Pb) phase is distributed interdendritically among (Cu) phase. Both experimental results and theoretical calculations reveal that the interfacial energy between (Co)/(Pb) liquid phases is larger than thoses of (Co)/(Cu) and (Cu)/(Pb) phases. The weak wetting ability between (Co) and (Pb) liquids results in the distribution of (Pb) phase inside the Cu-rich zone instead of Co-rich zone. Three possible solidification routes are deduced according to the solidification microstructure, in which the solidification process consists of phase separation L→L1(Cu)+L2(Co), peritectic transformation α(Co)+L→(Cu) and monotectic transformation L(Cu)→S(Cu)+L(Pb).

Keywords:

作者及机构信息

1.
西北工业大学,应用物理系,西安 710072

基金项目: 国家自然科学基金(批准号:50971105) ,陕西省自然科学基金研究计划(批准号:2009JQ6002)和西北工业大学基础研究基金(批准号: JC201050和G9KY1021)资助的课题.

Authors and contacts

1.
Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072, China

参考文献

[1]	Chung H J, Composto R J 2004 Phys. Rev. Lett. 92 185704
[2]	Krekhov A 2009 Phys. Rev. E 79(R) 035302
[3]	Wang W L, Zhang X M, Qin H Y, Wei B 2009 Phil. Mag. Lett. 89 683
[4]	Náraigh L , Thiffeault J L 2007 Phys. Rev. E 76(R) 035303
[5]	Huang L J, Liu B X 1990 Appl. Phys. Lett. 57 1401
[6]	Zhai W, Wang N, Wei B 2007 Acta Phys. Sin. 56 2353(in Chinese)[翟薇、王楠、魏炳波 2007 物理学报 56 2353]
[7]	Li H L, Zhao J Z, 2008 Appl. Phys. Lett. 92 241902
[8]	Luo B C, Liu X R, Wei B 2009 J. App. Phys. 106 053523
[9]	Schaffer P L, Mathiesen R H, Arnberg L 2009 Acta Mater. 57 2887
[10]	Liu X R, Wang N, Wei B 2005 Acta Phys. Sin. 54 1671(in Chinese) [刘向荣、王楠、魏炳波 2005 物理学报 54 1671]
[11]	Cao C D 2006 Chin. Phys. 15 872
[12]	Kaban I G, Hoyer W 2008 Phys. Rev. B 77 125426
[13]	Tafa K, Puri S, Kumar D 2001 Phys. Rev. E 64 056139
[14]	Nishizawa T, Ishida K 1984 Binary Alloy Phase Diagram (2nd ed) (New York: ASM International) p1181
[15]	Chakrabarti D J, Laughlin D E 1984 Binary Alloy Phase Diagram (2nd Ed.) (New York: ASM International) p1452
[16]	Massalski T B 1990 Binary Alloy Phase Diagram (2nd ed) (New York: ASM International) p1220
[17]	Zhao S, Li J F, Liu L, Zhou Y H 2009 Chin. Phys. B 18 1674
[18]	Cahn J W, Hilliard J H 1958 J. Chem. Phys. 28 258
[19]	Gale W F, Totememier T C 2004 Smithells Metals Reference Book (8th Ed.) (London: Butterworth) p14-1
[20]	Metzger G 1959 Z. Phys. Chem. 211 1
[21]	Borchers C, Bormann R 2005 Acta Mater. 53 3695
[22]	Marangoni C 1871 Ann. Phys. Chem. 143 337

施引文献

[1]	Chung H J, Composto R J 2004 Phys. Rev. Lett. 92 185704
[2]	Krekhov A 2009 Phys. Rev. E 79(R) 035302
[3]	Wang W L, Zhang X M, Qin H Y, Wei B 2009 Phil. Mag. Lett. 89 683
[4]	Náraigh L , Thiffeault J L 2007 Phys. Rev. E 76(R) 035303
[5]	Huang L J, Liu B X 1990 Appl. Phys. Lett. 57 1401
[6]	Zhai W, Wang N, Wei B 2007 Acta Phys. Sin. 56 2353(in Chinese)[翟薇、王楠、魏炳波 2007 物理学报 56 2353]
[7]	Li H L, Zhao J Z, 2008 Appl. Phys. Lett. 92 241902
[8]	Luo B C, Liu X R, Wei B 2009 J. App. Phys. 106 053523
[9]	Schaffer P L, Mathiesen R H, Arnberg L 2009 Acta Mater. 57 2887
[10]	Liu X R, Wang N, Wei B 2005 Acta Phys. Sin. 54 1671(in Chinese) [刘向荣、王楠、魏炳波 2005 物理学报 54 1671]
[11]	Cao C D 2006 Chin. Phys. 15 872
[12]	Kaban I G, Hoyer W 2008 Phys. Rev. B 77 125426
[13]	Tafa K, Puri S, Kumar D 2001 Phys. Rev. E 64 056139
[14]	Nishizawa T, Ishida K 1984 Binary Alloy Phase Diagram (2nd ed) (New York: ASM International) p1181
[15]	Chakrabarti D J, Laughlin D E 1984 Binary Alloy Phase Diagram (2nd Ed.) (New York: ASM International) p1452
[16]	Massalski T B 1990 Binary Alloy Phase Diagram (2nd ed) (New York: ASM International) p1220
[17]	Zhao S, Li J F, Liu L, Zhou Y H 2009 Chin. Phys. B 18 1674
[18]	Cahn J W, Hilliard J H 1958 J. Chem. Phys. 28 258
[19]	Gale W F, Totememier T C 2004 Smithells Metals Reference Book (8th Ed.) (London: Butterworth) p14-1
[20]	Metzger G 1959 Z. Phys. Chem. 211 1
[21]	Borchers C, Bormann R 2005 Acta Mater. 53 3695
[22]	Marangoni C 1871 Ann. Phys. Chem. 143 337

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