Work Hardening Behavior of B10 Copper-Nickel Alloy Under Cold Compression Deformation

The compression deformation at room temperature with strain rate of 0.01 s^-1 of B10 copper-nickel alloy was carried out, and the maximum deformation amount was 50％. The microstructure evolution and work hardening behavior were studied. The modified Ludwik model was used to describe the true stress-strain curve of the test alloy. The results show that the work hardening of the test alloy occured during compression. The work hardening rate decreased continuously with the increase of true strain, but the decreasing rate became slower. With the increase of deformation amount, the test alloy grains elongated, deformation bands and high density dislocation appeared inside the grains, the number of twins increased, and the plastic deformation mechanism gradually changed from the dislocation strengthening mechanism to the comprehensive strengthening mechanism of dislocation strengthening and deformation twins. The modified Ludwik model σ=Kε^m+nlnεcould accurately fit the true stress-true strain data of the test alloy, and the correlation coefficient was 0.98.