Micromechanisms of fracture and strengthening in free-standing Pt-aluminide bond coats under tensile loading

Creep behavior of Pt-aluminide (PtAl) coated directionally solidified Ni-based superalloy CM-247LC after thermal exposure

“…stand-alone coating specimen without any substrate attached to it), has revealed that the coating exhibits significantly lower yield strength of about 45-75 MPa and appreciable ductility in the temperature range 800-900°C [35][36][37]. This is consistent with the reduced creep resistance observed in case of as-coated alloy in the present study (Table 1 and Figs.…”

Diffusion behaviour of Pt in platinum aluminide coatings during thermal cycles

“…5c) shows that the white regions are PtAl 2 -rich (higher Pt content) and the black regions are b-(Ni,Pt)Al-rich (lower Pt content). This is consistent with a previous work, where it was observed that the increase of Pt layer thickness favoured the formation of PtAl 2 phase in the fabrication process [25]. After thermal cycling, some PtAl 2 -rich white stripes grew larger (*10 lm, Fig.…”

First-principles investigation on hydrogen doping of PtAl2 alloy

“…The first-principles calculation shown that the calculated boundary energy of Pt 3 Al along (1 1 1) and (0 1 0) planes is about of 205 mJ/m 2 and 414 mJ/m 2 , respectively [17]. PtAl alloy appears a linear stress-strain response under tensile loading and undergoes brittle cleavage fracture at temperatures below the brittle-to-ductile transition temperature [18]. Benoist et al found that the PtAl 2 alloy can modify the mechanical properties of Ni-based alloys and improve brittle for this superalloys thermal barrier interface [19].…”