Abstract:Experiments have been carried out on the 3 MeV electron microscope in Toulouse. The low temperature straining holder has been previously described Images given by an image intensifier are recorded on magnetic tape.The microtensile niobium samples are cut in a plane with the two operative slip directions  and lying in the foil plane. The tensile axis is near .Our results concern:- The transition temperature of niobium near 220 K: at this temperature and below an increasing difference appears betwee… Show more
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