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Nickel (Ni) improves the room temperature ductility, hot workability and sinterability of γ-TiAl based alloys. This study investigates the microstructure of a powder metallurgy nickel-doped Ti–45Al–5Nb–0.2C–0.2B–1.25Ni alloy based on detailed transmission electron microscopy (TEM) studies. The alloy was sintered at 1375 °C for 120 min, followed by cooling to 900 °C for a subsequent ageing treatment...
The multi-phase microstructural evolution in an Mg–Y–Gd–Zn alloy during ageing at 225 °C was studied in TEM and the age-hardening mechanism is elucidated in this paper. Two independent precipitation reactions were observed in this alloy, i.e. α-Mg(SSS) + β(Mg 24 (Y,Gd,Zn) 5 ) → α + β + 18R and α-Mg(SSS) → βʺ(D0 19 ) → β′(cbco) → β 1 (fcc) → β. The age-hardening contribution...
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