Impurity behavior in V–4Cr–4Ti–Y alloys produced by levitation melting

Nagasaka, Tetsuya; Muroga, T.; Hino, T.; Satou, Mamoru; Abe, Katsunori; Chuto, Toshinori; Iikubo, Tomohito

doi:10.1016/j.jnucmat.2007.03.076

Cited by 18 publications

(11 citation statements)

References 10 publications

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“…In the case of Y-containing alloys, as indicated earlier in the discussion, the likelihood is that the Y would have removed the pre-existing oxides or formed in preference to the other oxides. These may have floated off to the ingot surface [19].…”

Section: Discussionmentioning

confidence: 99%

High glass formability for Cu–Hf–Ti alloys with small additions of Y and Si

Figueroa¹,

Davies²,

Todd³

2009

Philosophical Magazine

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The effects of small substitutions of Si and Y on the glass forming ability of a Cu 55 Hf 25 Ti 20 glassy alloy are reported and discussed. Fully glassy rods with diameters up to 7 mm and 6.5 mm, were produced for Cu 54.5 Hf 25 Ti 20 Si 0.5 and Cu 55-x Hf 25 Ti 20 Y 0.3 alloys, respectively. The addition of Si enlarged ∆T x (=T x-T g , where T g and T x are crystallisation and glass transition temperatures, respectively) considerably from 25 to 53 K for the Cu 54 Hf 25 Ti 20 Si 1 alloy. However, the results showed that the parameters obtained from thermal analysis, such as T rg , ∆T x and γ[=T x /(T g +T l)] are not reliably correlated with the glass forming ability (GFA), at least for these bulk glass forming alloys. The scavenging effects of the Y and Si, in particular the possibility of Y reducing the oxides, could be responsible for enhancing the GFA. It is proposed that the effectiveness of small additions of Si in enhancing the GFA may be the result of the possible formation of HfSiO 4 having a very large negative enthalpy of formation and, as a strong network former, it would form glassy particles which would be ineffective as nucleating agents.

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Section: Discussionmentioning

confidence: 99%

High glass formability for Cu–Hf–Ti alloys with small additions of Y and Si

Figueroa¹,

Davies²,

Todd³

2009

Philosophical Magazine

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show abstract

“…Fine grains and oxide dispersions increased high temperature strength and inhibited formation of interstitial loops in the matrix during neutron irradiation, because of the enhanced defect sinks [39]. Recent results showed that the further addition of Ti to V-Y enhances strength [40].…”

Section: Improvement Of Alloy Propertiesmentioning

confidence: 99%

Review of advances in development of vanadium alloys and MHD insulator coatings

Muroga

Chen

Чернов

et al. 2007

Journal of Nuclear Materials

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“…V-4Cr-4Ti-0.18O was 30 g-scale button and fabricated by arc-melting. V-4Cr-4Ti-Y alloys were fabricated by a levitation melting process in 15 kg-scale [5]. Two types V-4Cr-4Ti-Y alloys were prepared; one was a high-purity alloy (V-4Cr-4Ti-0.11Y-0.009O), and the other was an alloy doped with oxygen (V-4Cr-4Ti-0.06Y-0.27O).…”

Section: Methodsmentioning

confidence: 99%

“…It is widely recognized that the reduction of these impurities is essential for maintaining workability [3] and weldability [4]. It has been reported that a small addition of yttrium (Y) was effective to reduce interstitial O and improve ductility after neutron irradiation without degradation of low-temperature impact properties [5][6][7]. While Y addition moderates the hardening induced by O, it can also degrade high-temperature strengths [8].…”

Section: Introductionmentioning

confidence: 99%