Effect of prior cold work on age hardening of Cu-4Ti-1Cd alloy |
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| Authors: | R Markandeya S Nagarjuna D S Sarma |
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| Affiliation: | (1) Department of Metallurgical Engineering, Institute of Technology, Banaras Hindu University, Varanasi, 221 005, India;(2) Defence Metallurgical Research Laboratory, Kanchanbagh-PO, Hyderabad, 500 058, India;(3) Present address: Department of Metallurgical Engineering, College of Engineering, J N T U, Kukatpally, Hyderabad, 500 072, India |
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| Abstract: | This research is part of a project whose scope was to develop high strength ternary alloys based on Cu-Ti system with the
primary aim of substituting them for toxic and expensive Cu-Be alloys. In this pursuit, age hardening behaviour of Cu-4Ti-1Cd
alloy has already been investigated and the present paper reports the investigations on the influence of prior cold work by
rolling of 50, 75 and 90% on the age hardening of a Cu-4Ti-1Cd alloy using hardness and tensile tests and optical as well
as transmission electron microscopy. As a result of cold work followed by aging, hardness of the alloy increased from 237 Hv
in solution treated condition to 425 Hv on 90% cold work and peak aging. Similarly, yield and tensile strengths of the alloy
reached maxima of 1037 and 1252 MPa respectively on 90% deformation and peak aging. The microstructure of the deformed alloy
exhibited elongated grains and deformation bands. The maximum strength on peak aging was obtained due to precipitation of
ordered, metastable and coherent βl, Cu4Ti phase in addition to high dislocation density and deformation twins. Both hardness and strength of the alloy decreased
on overaging due to the formation of incoherent and equilibrium β, Cu3Ti phase. However, the morphology of the discontinuous precipitation was changed to globular shape due to large deformations
and overaging. |
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