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Corrosion fatigue (CF) tests of 316LN weld metal were investigated in high-temperature water at different strain rates (0.0004–0.4%/s) under strain amplitude of 0.6%. Relationship between CF life and strain rate was proposed and environmental fatigue correction factor F en was also calculated. It was found that the γ/δ phase boundary was more susceptible to cracking at low strain rates and δ-ferrite worked as a barrier to retard the crack growth at high strain rates. Mechanisms of CF damage involving the effects of strain rate, hydrogen, δ-ferrite and residual strain on crack growth are also discussed. • Quantitative relation between fatigue life of 316LN weld metal and strain rate is purposed. • Effect of δ-ferrite changed with strain rate due to the interaction between localized deformation and environmental damage. • Mechanisms of CF damage involving the effects of hydrogen and residual strain on crack growth are proposed. [ABSTRACT FROM AUTHOR]

Recently, metal halide perovskite materials (CsPbX 3 , X = Cl, Br, and I) have attracted extensive attention for designing optoelectronic devices owing to their tuneable bandgap and high photoluminescence quantum yields (PLQYs). However, the corresponding study of CsPbX 3 perovskite quantum dots (QDs) with blue luminescence still lags far behind that of their red and green counterparts. Herein, we developed aluminium (Al3+) ion-doped CsPbBr 3 perovskite QDs through a supersaturated recrystallization synthetic approach at room temperature. The crystal structure and optical properties of the as-prepared QDs were systematically characterized. The results reveal that the particle size and lattice spacing of Al3+ ion-doped CsPbBr 3 QDs decrease as the Al/Pb molar ratio increases, which is attributed to the radius of Al3+ ions being much smaller than Pb2+ ions. A significant blueshift in the luminescence from 503 nm to 465 nm of Al3+ ion-doped QDs is observed as the Al/Pb molar ratio increases. Moreover, high colour purity (wide full-width at half-maximum of 83.3 meV) blue photoluminescence emission at 465 nm with a PLQY of 65.7% is achieved when the Al/Pb ratio reaches 1.0 in the Al3+ ion-doped CsPbBr 3 QDs, which shows good stability under ambient atmosphere. These as-prepared high colour purity blue luminescence Al3+ ion-doped CsPbBr 3 QDs show promising potential in blue optoelectronic fields. • A facile strategy to synthesize less-lead Al3+ ion-doped CsPbBr 3 QDs at room-temperature was proposed. • A significant blueshift from 503 nm to 465 nm of Al3+ ion-doped QDs is observed as the Al/Pb molar ratio increase. • The high colour purity blue photoluminescence emission at 465 nm with PLQY of 65.7% is achieved. [ABSTRACT FROM AUTHOR]