Precipitation behavior and mechanical properties of Ti-Ni-Nb-Co alloys
Source abstract
Abstract
Abstract The Ti44.5Ni46.5-xNb9Cox (x = 0.5, 1, 2, 4) alloys were designated to investigate the effect of Co content and annealing treatment on the precipitation behavior and mechanical properties. The formation of nanoscale precipitates was being reported here for the first time in the Ti-Ni-Nb alloys due to the Co addition. For the Ti44.5Ni45.5Nb9Co1 and Ti44.5Ni44.5Nb9Co2 alloys, homogeneous GP zones and precipitates were observed at the lower annealing temperature. Additionally, the yield strength was enhanced by the higher strain field produced by the nano coherent precipitates. The effect of precipitation strengthening was weakened because of coarsened and clustered precipitates as annealing temperature increased. As a result, the highest yield strength of 520 MPa and the highest recovery stress of 482 MPa could be realized in the Ti44.5Ni44.5Nb9Co2 alloy annealed at 550 °C.
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Research context
OpenAlex topics: Shape Memory Alloy Transformations · Titanium Alloys Microstructure and Properties · Intermetallics and Advanced Alloy Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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