268 Prakt. Met. Sonderband 46 (2014)
passive stage is followed, no TiC layer could be observed (fig. 1c). Probably, due to The oric
dissolution of TiC during annealing in vacuum atmosphere. like mol
concent
slightly
strongly
concent
concent
corresp
TiC laye
onthe s
5 um th
Fig. 1: The microstructure of NiTi wire after vacuum carburizing at 1000°C: (a) ta=6 min,
pc,H,=10 mbar; (b) ta=6 min, pc,H,=5 mbar; (c) ta=6 min, tp=6 min, pc,H,=10 mbar
Fig.
Conseqt
carburizi
morphol:
acicular
phases |
the TiNia
the grain
4. CON
i i iTi wi In this re
Fig. 2: The microstructure of NiTi wire before (a) and after vacuum carburizing (b, c) at used for
1000°C, ta=6 min, pc,H,=10 mbar memory