Phenomenon of Instantaneous Work Hardening Characteristics of Sintered Cold Deformed Cu Alloy Preforms

Abstract:

Work hardening behavior is an important phenomenon especially when a material is subjected to cold work. The two important parameters that expose this study are strain hardening exponent, n, and strength coefficient, K, according to ludwik equation, σ=Kε^ⁿ. In addition to strain as influencing factor for work hardening behavior, the attained density during deformation is also considered in the present investigation; a rational approach and its characteristic evaluation has been proposed. Thus a copper alloy preforms of three different aspect ratios prepared using conventional powder metallurgy method and a secondary deformation such as cold deformation were carried out till maximum density or fracture appears at the outer surface of deforming preforms. The dimensional and density measurements were carried out carefully and the same is utilized to explain the instantaneous work hardening behavior with respect to induced strain and attained density.

• Periodical: Advanced Materials Research (Volume 651)
• Pages: 295-301
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.651.295
• Online since: January 2013
• Authors: Ananthanarayanan Rajeshkannan, S. Narayan
• Keywords: Aspect Ratios, Instantaneous Hardening - Strain and Density, Instantaneous Strength Coefficient - Strain and Density

References

[1] CC. Huang, JH. Cheng, An investigation into the forming limits of sintered porous materials under different operational conditions, J. Mater Process Technol. 148 (2004) 382-393.

DOI: 10.1016/j.jmatprotec.2003.10.024

[2] XQ. Zhang, YH. Peng, MQ, Li, SC. Wu, XY. Ruan, Study of workability limits of porous materials under different upsetting conditions by compressible rigid plastic finite element method. J Mater Eng Perform. 9 (2000)164-169.

DOI: 10.1361/105994900770346114

[3] A. Rajeshkannan, S. Narayan, Strain hardening behaviour in sintered Fe-0. 8%C-1. 0%Si-0. 8%Cu powder metallurgy preform during cold upsetting. JEnggManufact. 223 (2009) 1567-1574.

DOI: 10.1243/09544054jem1587

[4] R M. German, Powder metallurgy science, second ed., Metal Powder Industries Federation, New Jersey, 1994, Ch: Full density processing, 301-338.

[5] MA. Taha, NA. El-Mahallawy, AM. El-Sabbagh, Some experimental data on workability of aluminium-particulate-reinforced metal matrix composites, J Mater Process Technol 202 (2008) 380-385.

DOI: 10.1016/j.jmatprotec.2007.07.047

[6] R. Narayanasamy, V. Anandakrishnan, KS. Pandey, Effect of geometric work-hardening and matrix work-hardening on workability and densification of aluminium-3. 5% alumina composite during cold upsetting, Mater Des. 29 (2008) 1582-1599.

DOI: 10.1016/j.matdes.2007.11.006

[7] DR. Kumar, C. Loganathan, R. Narayanasamy, Effect of glass in aluminum matrix on workability and strain hardening behaviorof powder metallurgy composite, Mater Des 32 (2011) 2413-2422.

DOI: 10.1016/j.matdes.2010.12.008

[8] K. Baskaran, R. Narayanasamy, An experimental investigation on work hardening behaviour of elliptical shaped billets of aluminium during cold upsetting, Mater Des. 29 (2008) 1240-1265.

DOI: 10.1016/j.matdes.2006.06.016

[9] R. Ebrahimi, N. Pardis, Determination of strainhardening exponent using double compression test, Mater SciEngg A. 518 (2009) 56-60.

DOI: 10.1016/j.msea.2009.04.050

[10] Dr. Kumar, R. Narayanasamy,C. Loganathan, Effect of glass and SiC in aluminum matrix on workability and strain hardening behaviorof powder metallurgy hybrid composites. Mater Des 34 (2012) 120-136.

DOI: 10.1016/j.matdes.2011.07.062

[11] A. Rajeshkannan, KS. Pandey, S. Shanmugam, R. Narayanasamy, Sintered eutectoid P/M steel behavior during cold upsetting, Materials Research, 11 (2008) 11-20.

DOI: 10.1590/s1516-14392008000100003