Abstract
The compositions of novel Ti–Cu–Ni–Nb alloys were designed by the proportional mixing of the Ti2Cu Laves phase and Ni60Nb40 eutectic unit. The Ti28Cu14Ni34.8Nb23.2 alloy is composed of Ti2Ni, NiNb, NbNi3 phases, and a small amount of amorphous structure; the Ti30Cu15Ni33Nb22 alloy is composed of Ti2Ni and NiNb phases; the NiNb phase can form the twin structure with the different twin planes in the two alloys. The Ti32Cu16Ni31.2Nb20.8 alloy is composed of the Ti2Ni, NiNb and Nb phases. The high strength of Ti28Cu14Ni34.8Nb23.2 and Ti30Cu15Ni33Nb22 alloys are attributed to grain refinement and twin strengthening; in addition, the existence of NiNb twins improves the strength and hardness of the two alloys, compared with that of Ti32Cu16Ni31.2Nb20.8 alloy. In this study, the proportional mixing of the Laves phase and eutectic unit is an effective method for the composition design of high entropy alloys with high strength.
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