Grain Refinement of Phosphorus Deoxidised Copper

Abstract:

DHP-Cu has been modified with small additions of nanosized MgO particles, with and without P and B additions; and Mg, B, Ti and Al additions to investigate their effect on the grain structure under TP1 casting condition. In comparison to a reference DHP-Cu cast sample which exhibited mainly coarse columnar grains, a coarse equiaxed grain structure has been achieved with a single addition of nanosized MgO particles to a residual content of 34 ppm Mg. Whereas no grain refinement has been observed with nanosized MgO particles and P and B additions to a residual content of 109 ppm and 0.15% (nominal), respectively, and with a single addition of Mg to a residual content of 16 ppm. The combined additions of B and Ti, and B and Al to a nominal residual content slightly beyond the DHP-Cu specification have produced excessive coarsening of grains. Keywords: nanosized MgO particles; grain refinement; DHP-Cu

• Periodical: Materials Science Forum (Volumes 790-791)
• Pages: 161-166
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.790-791.161
• Online since: May 2014
• Authors: Maria J. Balart*, Jayesh B. Patel, Zhong Yun Fan
• Keywords: DHP-Cu, Grain Refinement, Nanosized MgO Particles

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