Abstract
AbstractThe effects of zirconium addition on tensile properties and grain boundary (GB) chemistry in the Ni3Al alloys were studied. The results showed that with the increasing amount of Zr, the yield and ultimate strength increase, the elongation increases below 0.7 at. % Zr content and decreases above that content. Zirconium segregation to grain boundaries (GBs) is found by Auger electron spectroscopy (AES) study and the amount of Zr at GB is three times greater than that in the bulk. In situ transmission electron microscopy (TEM)/ scanning electron microscopy (SEM) investigation showed that slip can transfer across the GB to the adjacent grain in Zr-doped Ni3Al alloys. These results indicate that the effect of Zr on improving ductility of Ni3Al alloys had a strong relationship with the segregation of Zr on the GBs.
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