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Microstructural evolution in nanotwinned Ni-Mo-W alloys under  in situ  heating experiments is investigated in a transmission electron microscope. Migration of twin boundaries and grain boundaries as well as formation of carbide precipitates are observed at various temperatures and characterized at atomic resolution. These transformations are found to occur at temperatures that are ∼200°C lower in Mo-rich (Ni 85 Mo 13 W 2 ) specimens than in W-rich (Ni 86 Mo 3 W 11 ) specimens, which highlights the different efficacy of Mo and W solutes in stabilizing the nanotwinned structure. Inspection of various mechanisms points to the importance of elastic modulus mismatch as a pathway for enhancing nanotwin stability by alloying.

In situ TEM study of the thermal stability of nanotwinned Ni-Mo-W alloys