Abstract
Abstract We have investigated the relation between the negative temperature coefficient (NTC) in electrical resistivity and the formation of the athermal ω phase in Ti–xNb (26 ≤ x ≤ 29 at.%) alloys. The alloys with 26 ≤ x ≤ 28 exhibit NTC in electrical resistivity and a temperature hysteresis appears in the temperature region of NTC. In these alloys, athermal ω phase forms in the temperature range of NTC in resistivity. The alloy with x = 29 also shows NTC but no detectable temperature hysteresis appears. In this alloy, the athermal ω phase does not form, but diffuse satellites appear at g β + 1 / 2 ζ ζ ¯ 0 ∗ , where gβ is a reciprocal lattice vector of the β phase in the temperature range of NTC. These results suggest that NTC in the electrical resistivity in Ti–xNb alloys is related not only to the formation of the athermal ω phase but also to the appearance of diffuse satellites at g β + 1 / 2 ζ ζ ¯ 0 ∗ .
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