Microstructural stability of Fe–Cr–Al alloys at 450–550 °C

IMPROVING THE WELDABILITY OF FeCrAl ALLOYS THROUGH TiC ADDITIONS

FeCrAl alloys were prepared with TiC additions to act as hydrogen traps and improve resistance to hydrogen cracking. Weldability results showed that alloys with up to 20 wt% Al and 11 wt% Cr could be prepared crack-free with relatively small TiC additions of ~ 4 wt%. Thermogravimetric analysis of Fe-10Al-5Cr corrosion coupons with and without TiC has shown that the corrosion resistance is not s...

The effect of Y and Ti on FeCrAl oxidation at 1400 C

Inco alloy MA956 (Fe-20wt%Cr-4.5%Al-0.35%Ti + 3~01% Y203-A1203) was oxidized in 1 atm of dry, flowing O2 at 1400 OC. Good scale-metal adhesion was observed. Some spalling occurred upon cooling, but it remained within the oxide, not through to the bare metal. Cyclic experiments showed good scale adherence. Y was found to segregate to the oxide grain boundaries and by implication to have modified...

Embrittlement of Al-Li-Cu-Mg alloys at slightly elevated temperatures: microstructural mechanisms of hardening

When underaged, damage tolerant Al-Li based alloys are exposed to slightly elevated temperatures (60 to 100oC), their strength increases and toughness decreases. To study the first stages of this process, 8090 sheet in three underaged heat treatment conditions, including T3, T81 and a multistage temper, was exposed for 1000 h at 70°C. Using a model for strengthening in combination with a quanti...

Microstructural Changes of Al-Cu Alloys After Prolonged Annealing at Elevated Temperature

Confirming the Composition of Shape Memory Alloys by Microstructural Characterization

It is well known that the properties of shape memory alloys, such as binary Ni-Ti (nitinol), are very sensitive to composition.[1-3] Especially on the Ni-rich side of stoichiometry, the martensite/austenite phase transformation temperature decreases abruptly when Ni is increased only a few tenths of a weight percent.[4] In ternary high temperature shape memory alloys (HTSMAs) containing Pt, Pd,...