Enhanced Strength-Ductility Synergy in an Ultra-Strong Copper Alloy Via Coherent Nanoprecipitates and Stress-Induced Twinning
Materials research letters(2024)
Abstract
Deformation twins (DTs) and stacking faults (SFs) are rarely found in Cu-20Ni-20Mn alloy, which limits further strengthening of alloy. Here, we report ultra-strong Cu-20Ni-20Mn alloy prepared by introducing a high density of coherent nanoprecipitates. The ultimate tensile strength (UTS) of alloy can be largely enhanced to 1624.7 ± 14.7 MPa, while maintaining an acceptable elongation of 7.3 ± 0.5%. We find that the coherent nanoprecipitates contribute to an ultra-high true stress up to about 1740 MPa, which facilitate the formation of DTs. The strength and ductility improvement stems from the synergistic effect of dislocations, nanoprecipitates and DTs.
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Key words
Deformation twins,stress-induced twinning,coherent nanoprecipitates,stacking faults,copper alloy
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