Microstructure and mechanical properties of a CuNiTi alloy with a large product of strength and elongation

A Cu-10 Ni-2Ti wt.% alloy has been fabricated by induction melting and casting. The microstructure evolutions of the studied alloy treated with thermal-mechanical treatment were characterized. After homogenized at 950 degrees C for four hours, hot rolling by 80% at 900 degrees C solid solution treated at 970 degrees C for four hours, cold-rolled by 50%, aged at 450 degrees C for one hour, the hardness, electrical conductivity, tensile strength, yield strength, and the elongation of the studied alloy approached 181 HV, 22.1% IACS, 576 MPa, 486 MPa, and 14.6%, respectively. The studied alloy shows large products of strength and elongation (15.4 GPa%, 9.3 GPa.%, 8.41 GPa.%, and 10.1 GPa.% for the samples treated with a solid solution, under aged, peak aged, and over-aged states), which are much higher than those of other high strength conductive copper alloys. These findings are helpful in designing new high damage tolerance conductive materials. (C) 2019 Published by Elsevier B.V.