日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 78, No. 1 (2014),
pp. 7-15

The Influence of Zr, P Additions on Microstructure and Ductility of Cu-Ni-Si Forged Alloys

Shinji Tanaka, Mamoru Mizusawa, Hiroki Miura and Takehito Hagisawa

Muroran Research Laboratory, The Japan Steel Works, LTD., Muroran 051-8505

Abstract:

The influence of Zr and P additions on the microstructure and tensile ductility at room temperature of a Cu-4.2 mass%Ni-1.0 mass%Si forged alloy was investigated. The discontinuous precipitation and age hardening due to Ni2Si in the alloy was delayed by Zr and P additions. The activation energies for discontinuous precipitation were 124 kJ/mol for the Cu-Ni-Si alloy, 134 kJ/mol for the Zr-added alloy and 139 kJ/mol for P-added alloy. The tensile ductility of the Zr- and P-added alloys was drastically improved by decreasing dimpled fractures at the grain boundaries. These drastic increases in tensile ductility of the Zr- and P-added alloys was correlates with the delay of intergranular precipitation due to grain boundary segregation and dissolution of Zr and P in the Cu matrix. [doi:10.2320/jinstmet.J2013031]


(Received 2013/5/15)

Keywords:

copper-nickel-silicon alloy, forged alloy, zirconium, phosphorus, age hardening, discontinuous precipitate, activation energy, tensile ductility, grain boundary dimple


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