Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 50A, Issue 3, Pages 1389-1396Publisher
SPRINGER
DOI: 10.1007/s11661-018-5088-z
Keywords
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Funding
- cooperative program of Collaborative Research and Development Center for Advanced Materials (CRDAM) in IMR [18G0421]
- Japan Society for the Promotion of Science [18H01743]
- Japan Copper and Brass Association
- Grants-in-Aid for Scientific Research [18H01743] Funding Source: KAKEN
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The strength and electrical conductivity of Cu-Ti alloy wires fabricated by over-aging and intense drawing were investigated as a function of Ti content (2.7 to 4.3 at. pct). The microstructure of all over-aged Cu-Ti alloys before drawing showed mainly coarse cellular components laminating the plates of a terminal Cu solid solution and a -Cu4Ti intermetallic compound precipitated discontinuously by grain boundary reactions. The volume fraction of -Cu4Ti plates increased with Ti content, although the compositions of the two phases remained unchanged. When the over-aged alloys were drawn to the same deformation strain, the hardness and tensile strength of the wires increased monotonically with Ti content due to strain-induced strengthening; a high volume fraction of hard -Cu4Ti fibers formed from laminating plates during drawing promoted a high dislocation density in the matrix. The electrical conductivity of the wires decreased gradually with Ti content due to the higher volume fraction of -Cu4Ti fibers and due decomposition of the fibers during drawing. The overall performance of the Cu-Ti alloy wires improved as the Ti content increased and was superior to that of conventional Cu-Ti alloy wires fabricated by peak-aging and drawing, and to that of commercial Cu-Be alloy wires.
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