کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1613838 | 1005601 | 2013 | 4 صفحه PDF | دانلود رایگان |
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 gβ+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–x Nb alloys is related not only to the formation of the athermal ω phase but also to the appearance of diffuse satellites at gβ+1/2 ζ ζ¯ 0∗.
► 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 resistivity of the alloy with x = 26, 27 and 28 exhibit NTC and temperature hysteresis between cooling and heating processes. On the other hand, the resistivity of the alloy with x = 29 shows NTC with no temperature hysteresis.
► Although ω phase forms in the alloy with x = 28, it does not form in the alloy with x = 29. In the latter alloy, diffuse satellites at gβ+1/2 ζ ζ¯ 0∗ appear below Tmin when the zone axis is [1 1 1].
► We concluded that the NTC in electrical resistivity is related not only to the formation of the athermal ω phase but also to the appearance of a state with exhibiting diffuse satellites at gβ+1/2 ζ ζ¯ 0∗.
Journal: Journal of Alloys and Compounds - Volume 577, Supplement 1, 15 November 2013, Pages S431–S434