Precipitation hardening of Cu – Ti – Zr alloys

Authors: Markandeya, R.¹; Nagarjuna, S.²; Sarma, D.S.¹

Source: Materials Science and Technology, Volume 20, Number 7, July 2004 , pp. 849-858(10)

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Abstract:

The influence of age hardening temperature and time on the hardness, tensile properties, electrical conductivity, and microstructure of Cu – 4Ti – 0.1Zr and Cu – 3Ti – 0.1Zr alloys has been investigated. The resulting microstructure of these alloys suggests that zirconium addition prohibited the formation of compositional modulations in the solution treated condition. These alloys exhibited maximum hardness and strength on peak aging at 450°C for 24 h by the formation of a coherent and metastable Cu₄Ti phase (β') in modulated structure while overaging occurred by the formation of equilibrium phase β-Cu₃Ti. The electrical conductivity of both the alloys increased moderately on aging. Unlike in an earlier study of binary Cu – Ti and some ternary Cu – Ti – X alloys, overaging did not cause any discontinuous precipitation in the Cu – Ti – Zr alloys investigated. Modulated structure formed on peak aging persisted on prolonged aging at 450°C for 80 h or at 500°C for 8 h.

Keywords: COPPER ALLOYS; ZIRCONIUM; AGE HARDENING; ELECTRICAL CONDUCTIVITY

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/026708304225017409

Affiliations: 1: Department of Metallurgical Engineering, Institute of Technology, BHU,Varanasi 221 005, India 2: Defence Metallurgical Research Laboratory,Kanchanbagh, Hyderabad 500 058, India.

Publication date: 2004-07-01

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Precipitation hardening of Cu – Ti – Zr alloys

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