Dispersions of Particles and Heat Resistance in a Cu-Fe-P Alloy(Special Issue on Composite Materials)

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  • Cu-Fe-P合金の粒子分散と耐熱性(<特集>複合材料)

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The influence of dispersions of particles on the recrystallization behavior has been examined in industrially processed specimens of a Cu-Fe-P alloy(CDA194). The specimens are produced through the steps of hot rolling, cold rolling, aging and final cold rolling. The γ→α martensitic transformation of small coherent γ-Fe precipitate particles which form on decreasing temperature during hot rolling is induced by subsequent cold rolling. Aging following the cold rolling produces fine γ-Fe particles, which are transformed to α-Fe by final cold rolling. The nucleation of recrystallization occurs predominantly at coarse Fe_3P particles, observed after the hot rolling, larger than about 1μm in diameter. A denser dispersion of smaller α-Fe particles shows a larger retarding effect on grain-boundary migration. A specimen with smaller α-Fe and smaller Fe_3P particles has a higher heat resistance and a higher strength.

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