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