0185179 - UJF-V 20000353 RIV US eng J - Journal Article
Tomota, Y. - Harjo, S. - Lukáš, Petr - Neov, Dimitar
In situ neutron diffraction during shape memory behavior in a Fe-Mn-Si-Cr alloy.
JOM. Roč. 52, č. 10 (2000), s. 32-34. ISSN 1047-4838. E-ISSN 1543-1851
R&D Projects: GA ČR GV202/97/K038; GA AV ČR KSK1010601
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 0.560, year: 2000

The internal stress change in the austenite matrix during shape memory behavior in a ferrous alloy was examined by means of an in situ neutron diffraction technique. After tensile deformation accompanying the austenite to epsilon martensite transformation, the internal stress is yielded. The averaged internal elastic strain in 111 oriented austenite grains was measured. The internal stress remained after tensile straining and decreased after the subsequent reverse transformation of heating, i.e., shape recovery process. When the tensile straining and subsequent annealing was performed repeatedly, which is a kind of "training", the measuredrecovery strain increased and the stress-induced transformation started at a lower applied stress in subsequent cycles. These findings suggest that a key point for improving theshape memory effect is to increase the ability of the alloyto accumulate oriented internal stress generated by the martensitic transformation.
Permanent Link: http://hdl.handle.net/11104/0081591