Measurements of strain, texture and phase fraction in aged Ni-rich NiTi shape memory alloys by neutron powder diffraction technique under<b>in situ</b>torsional loading

Sitepu, H.; Klönne, M.; Schmahl, Wolfgang W.; Predki, W.; Pirling, Thilo

doi:10.1051/jp4:20031005

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“…The Ni 50.8 at.-% sample was solution annealed, water quenched and subsequently aged at 500 C for 15 minutes. Further experimental details are given in [4,5]. Secondly, a space-resolved synchrotron experiment was conducted on a flat 50.7 at.-% sample, which had been optimized for superelastic behaviour by solution annealing, and cold rolling with 10 % thickness reduction at -150 C, and subsequent annealing for 6 minutes at 500 C [3].…”

Section: Materials and Experimental Conditionsmentioning

confidence: 99%

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In‐situ diffraction investigation of superelastic NiTi shape memory alloys under mechanical stress with neutrons and with synchrotron radiation

Khalil‐Allafi

Hasse²,

Klönne

et al. 2004

Materialwissenschaft Werkst

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In-situ diffraction investigations of superelastic NiTi shape memory alloys with neutron and synchrotron x-ray radiation were used to examine the evolution of the phase state of the material as a function of stress and strain, respectively. The results suggest that the transition from austenite to martensite is not complete even at the end of the superelastic plateau, and that significant load transfer to residual austenite takes place.Keywords: Neutron diffraction, x-ray diffraction, evolution of phase state, residual austenite Der Phasenanteil in superelastischen NiTi Formgedächtnislegie-rungen als Funktion von Spannung und Dehnung wurde mittels Neutronen-und Röntgen-Diffraktometrie in-situ untersucht. Die Ergebnisse deuten darauf hin, dass die Umwandlung von Austenit zu Martensit selbst am Ende des superelastischen Plateaus nicht vollständig abgeschlossen ist, und dass ein deutlicher Lasttransfer auf den residuellen Austenit stattfindet.

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Section: Materials and Experimental Conditionsmentioning

confidence: 99%

“…The first was done with neutron diffraction at the D1A beamline at ILL, France, employing a torsional loading frame for the testing of coupling elements [4,5]. The sample was a hollow shaft with 8 mm outer diameter, 6 mm inner diameter and 60 mm gauge length.…”

Section: Materials and Experimental Conditionsmentioning

confidence: 99%