STUDY OF THE COARSENING AND HARDENING BEHAVIORS OF COHERENT g-Fe PARTICLES IN Cu-2.1Fe ALLOY

doi:10.11900/0412.1961.2014.00152

Acta Metall Sin

2014, Vol. 50

Issue (10): 1224-1230 DOI: 10.11900/0412.1961.2014.00152

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STUDY OF THE COARSENING AND HARDENING BEHAVIORS OF COHERENT g-Fe PARTICLES IN Cu-2.1Fe ALLOY

DONG Qiyi, SHEN Leinuo, CAO Feng, JIA Yanlin, WANG Mingpu(

)

School of Materials Science and Engineering, Central South University, Changsha 410083

Cite this article:

DONG Qiyi, SHEN Leinuo, CAO Feng, JIA Yanlin, WANG Mingpu. STUDY OF THE COARSENING AND HARDENING BEHAVIORS OF COHERENT g-Fe PARTICLES IN Cu-2.1Fe ALLOY. Acta Metall Sin, 2014, 50(10): 1224-1230.

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Abstract

As one of the most widely used integrated circuit (IC) lead frame materials, Cu-2.1Fe alloy (C19400) shows excellent comprehensive properties, such as 90° bend fatigue, 90° bend formability, corrosion-proof, solder ability and resistance of solder peeling off. As a successful medium-strength and high-conductivity copper alloy, the Cu-2.1Fe alloy is strengthened by precipitation hardening and work hardening. Metastable coherent g-Fe particles will precipitate from supersaturated copper matrix during aging. The effects of long-term aging at different temperatures on the g-Fe coarsening characteristics and the mechanical properties of Cu-2.1Fe alloy were investigated, by means of conventional TEM, SEM, hardness, tensile strength and electrical conductivity testing. The results show that solution-treated Cu-2.1Fe alloys can reach its peak hardness and maintain for a longer time when aging at 500 ℃. The maximum of strength occurred at a particle size of about 12 nm in mean diameter. The coarsening kinetics of g-Fe follows Lifshitz-Slyozov-Wagner (LSW) theory and the activation energy for growth is estimated to 222 kJ/mol. Furthermore, it is found that coherent Fe particles gradually evolve into semi-coherent and cubical particles after aging for a long time and at high temperatures. The aging strengthening effect of Fe particles is not significant, and the maximum increment of stress is about 100 MPa. The strengthening mechanism of undeformed Cu-Fe alloy is coherency strengthening during the under-aged stage and changes to Orowan mechanism during the over-aged stage. Experimental results are in agreement with theoretical predictions.

Key words: Cu-2.1Fe alloy coherent particle coarsening strengthening theory

Received: 31 March 2014

ZTFLH:

TG146.1

Fund: Supported by Open-End Fund for the Valuable and Precision Instruments of Central South University (No.CSUZC20140012)

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	Qiyi DONG
	Leinuo SHEN
	Feng CAO
	Yanlin JIA
	Mingpu WANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00152 OR https://www.ams.org.cn/EN/Y2014/V50/I10/1224

Fig.1 Phase diagram of Cu-Fe alloy^[10]

Fig.2 Hardness and electrical conductivity variations of the Cu-2.1Fe alloy with different aging temperatures for 1 h

Fig.3 Hardness (a) and electrical conductivity (b) variations of the Cu-2.1Fe alloy with aging temperatures of 400, 500, 600 and 700 ℃ for different times

Fig.4 TEM images of coherent g-Fe particles in Cu-2.1Fe alloy with aging temperatures of 500 ℃ (a), 600 ℃ (b) and 700 ℃ (c) for 1 h

Fig.5 TEM images of coherent and incoherent Fe particles in Cu-2.1Fe alloy (Insets at the top right corner show the corresponding SAED patterns)

Fig.6 Changes of Fe particle size with aging time at 500~700 ℃

Fig.7 Coarsening plot (a) and the calculation of coarsening active energy of Fe particles (b) in Cu-2.1Fe alloy aged at 500, 600 and 700 ℃

Fig.8 SEM images of fracture micrographs in Cu-2.1Fe alloy for solution treatment (a) and after aging at 500 ℃ for 1 h (b)

Table 1 Mechanical properties of Cu-2.1Fe alloy for different aging treatments

Fig.9 Calculated strengthening vs precipitate radius for Cu-2.1Fe alloy (The maximum of tensile stress occurs at r≈b×24=6.12 nm, CS—coherency strengthing, OS—Orowan strengthing, r—average radius, b—Burgers vector, r₀-inner cut-off distance for the dislocation line energy)

[1]	Song L N, Liu J B, Huang L Y, Zeng Y W, Meng L. Acta Metall Sin, 2012; 48: 1459
	(宋鲁南, 刘嘉斌, 黄六一, 曾跃武, 孟亮. 金属学报, 2012; 48: 1459)
[2]	Wu Z W, Liu J J, Chen Y, Meng L. J Alloys Compd, 2009; 467: 213
[3]	Dong Q Y, Wang M P, Jia Y L, Chen C, Xia C D. Trans Mater Heat Treat, 2013; 34(6): 75
	(董琦祎, 汪明朴, 贾延琳, 陈畅, 夏承东. 材料热处理学报, 2013; 34(6): 75)
[4]	Dai J Y, Yin Z M, Song L P, Yuan Y. Chin J Nonferrous Met, 2009; 19: 1969
	(戴娇燕, 尹志民, 宋练鹏, 袁远. 中国有色金属学报, 2009; 19: 1969)
[5]	Cao H, Min J Y, Wu S D, Xian A P, Shang J K. Mater Sci Eng, 2006; A431: 86
[6]	Lu D P, Wang J, Zeng W J, Liu Y, Lu L, Sun B D. Mater Sci Eng, 2006; A421: 254
[7]	Kim H G, Lee T W, Han S Z, Euh K, Kim W Y, Lim S H. Met Mater Int, 2012; 18: 335
[8]	Yan X D, Tu S J, Huang G J, Xie S S. Chin J Rare Met, 2005; 29: 635
	(闫晓东, 涂思京, 黄国杰, 谢水生. 稀有金属, 2005; 29: 635)
[9]	Shigenori H, Shigeoki S. J Jpn Copper Brass Res Assoc, 1970; 9: 201
	(堀茂徳, 佐治重興. 伸銅技術研究會誌, 1970; 9: 201)
[10]	Baker H.ASM Handbook-Alloy Phase Diagrams. Materials Park, Ohio: ASM International, 1992: 734
[11]	Matsuura K, Tsukamoto M, Watanabe K. Acta Metall, 1973; 21: 1033
[12]	Kinsman K R, Sprys J W, Asaro R J. Acta Metall, 1975; 23: 1431
[13]	Easterling K E, Miekk-oja H M. Acta Metall, 1967; 15: 1133
[14]	Lifshitz I M, Slyozov V V. J Phys Chem Solids, 1961; 19: 35
[15]	Wagner C. Z Elektrochem, 1961; 65: 581
[16]	Mackliet C A. Phys Rev, 1958; 109: 1964
[17]	Ardell A J. Metall Trans, 1985; 16A: 2131
[18]	Martienssen W, Warlimont H.Springer Handbook of Condensed Matter and Materials Data. Heidelberg, Berlin: Springer, 2005: 132
[19]	Lee J, Jung J Y, Lee E S, Park W J, Ahn S, Kim N J. Mater Sci Eng, 2000; A277: 274
[20]	Donoso E, Espinoza R, Dianez M J, Criado J M. Mater Sci Eng, 2012; A556: 612
[21]	Pang Y, Xia C D, Wang M P, Li Z, Xiao Z, Wei H G, Sheng X F, Jia Y L, Chen C. J Alloys Compd, 2014; 582: 786
[22]	Guo M X, Shen K, Wang M P. Acta Mater, 2009; 57: 4568

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