Nb doping in Ti 3 AlC 2 : Effects on phase stability, high-temperature compressive properties, and oxidation resistance
Source abstract
Abstract
Abstract Nb-based ‘312’ MAX phase has not been recognized so far, raising a hypothesis that Nb doping would destabilize the isostructural Ti 3 AlC 2 . Here we report that (Ti 1 −x Nb x ) 3 AlC 2 could persist with a doping limitation up to x = 0.15. As demonstrated by HAADF-STEM analysis, Nb dopants homogeneously distribute among polycrystalline grains at the microscale and randomly occupy the Ti sites at the atomic level. Beyond the limitation, Nb-doped ‘312’ phase Ti 3 AlC 2 decomposes into (Ti,Nb)C, Nb-doped ‘211’ phase Ti 2 AlC, and Nb-based ‘413’ phase. Compared to pristine Ti 3 AlC 2 , the compressive strength of (Ti 0.9 Nb 0.1 ) 3 AlC 2 at 1200 °C increases by 130%, whereas doping at this level impairs the oxidation resistance. Improving high-temperature strength without deteriorating oxidation resistance can be achieved by 5% Nb doping.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: MXene and MAX Phase Materials · Aluminum Alloys Composites Properties · 2D Materials and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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