Effect of Fe particle on the surface peeling in Cu−Fe−P lead frame

Abstract

Under the surface peeling of Cu−Fe−P lead frame alloy larger Fe particles were observed by energy dispersive spectroscopy. By using the large strain two-dimension plane strain model and elastic-plastic finite element method, the cause for peeling damage of Cu−Fe−P lead frame alloy was investigated. The results show that when the content of Fe particles is more than 30% at local Fe-rich area the intense stress concentration in the Fe particle would make the Fe particle broken up. The high equivalent stress mutation and the mismatch of equivalent strain 10% at the two sides of interface make it easy to develop to crack and peeling damage on finish rolling. The larger Fe particles in the Cu−Fe−P alloy should be avoided.

Keywords

Cu−Fe−P lead frame / surface peeling / equivalent Stress / equivalent strain

References

[1] Liu P, Kang B X, Cao X G. Aging Precipitation and Recrystallization of Rapidly Solidified Cu−Cr−Zr−Mg Alloy[J]. Materials Science and Engineering, 1999, 265: 262-267.

[2] Correia J B, Davies H A, Sellars C M. Strengthing in Rapidly Solidified Age Hardened Cu−Cr and Cr−Cr−Zr Alloys[J]. Acta Mater., 1997, 45(1): 177-190.

[3] Zhao D M, Dong Q M, Liu P. Structure and Strength of the Age Hardened Cu−Ni−Si Alloy[J]. Materials Chemistry and Physics, 2003, 79: 81-86.

[4] Su J H, Dong Q M, Liu P. Prediction of Properties in Thermomechanically Treated Cu−Cr−Zr by an Article Neural Network [J]. Journal of Materials Science and Technology, 2003, 19(6): 529-532.

[5] Ryu H J, Baik H K. Effect of Thermomechanical Treatment on Microstructure and Properties of Cu-base Leadframe Alloy [J]. Journal of Materials Science, 2000, 35: 3 641-3 646.

[6] Choi H I. Fabrication of High Conductivity Copper Alloys by Rod Milling[J]. Journal of Materials Science Letters, 1997, 16: 1 600-1 602.

[7] Huang F X, Ma J S. Analysis of Phases in a Cu−Cr−Zr Alloy [J]. Scripta Materialia, 2003, 48: 97-102.

[8] Landis C M, Beyerlein I J, Mcmeeking R M. Micro-mechanical Simulation of the Failure of Fiber Reinforced Composites [J]. Journal of the Mechanics and Physics of Solids, 2000, 48: 621-648.

[9] Gonzaalez C, Llorca J. A Self-consistent Approach to the Elasto-plastic Behaviour of Two-phase Materials Including Damage[J]. Journal of the Mechanics and Physics of Solids, 2000, 48: 675-692.

[10] Li Y, Ramesh K T, Chin S C. Viscoplastic Deformations and Compressive Damage in an A359/SiCP Metal-matrix Composite[J]. Acta Mater., 2000, 48: 1 563-1 573.

[11] Gall K. Atomistic Simulations on the Tensible Debonding of an Aluminum-silicon Interface[J]. Journal of the Mechanics and Physics of Solids, 2000, 48: 2 183-2 212.

[12] Gall K. Finite Element Analysis of the Stress Distributions Near Damaged Si Particle Clusters in Cast Al−Si Alloys[J]. Mechanics of Materials, 2000, 32: 277-301.

[13] Lippmann N, Lehman A, Steinkopff T. Modelling of the Fracture Behaviour of High Speed Steels Under Static Loading [J]. Computer Materials Science, 1996, 7: 123-130.

[14] Bohm H J, Han W. Comparisons Between Three-dimensional and Two-dimensional Multi-particle Unit Cell Models for Particle Reinforced MMCs[J]. Model. Simul. Mater. Sci. Eng., 2001, 2: 47-65.

[15] Geni M, Kikuchi M. Damage Analysis of Aluminium Matrix Composite Considering Nonuniform Distribution of SiC Particles[J]. Acta Metall. Mater., 1998, 46: 3 125-3 133.