Creep Behavior of Ti&amp;ndash;40Al&amp;ndash;16Nb Intermetallic Alloy and Strengthening Effects of Minor Sc

Zhan, Cheng; Koo, Chun-Hao

doi:10.2320/matertrans.47.440

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…Following preliminary studies of the Mg−Sc−Mn system, Mordike examined squeeze cast Mg−Sc and Mg−Gd binaries, an Mg−Sc−Mn ternary and several quaternaries Mg−Mn−(Sc−Ce, Gd−Sc, Y−Sc). 160,161 For the Mg−Sc binary no precipitation or improvement of creep properties is observed. However, for the Mn-containing alloys precipitation of Mn 2 Sc (both within grains and at grain boundaries) was observed in the as-cast and T5 heat-treated conditions and creep resistance is improved significantly.…”

Section: Creep Propertiesmentioning

confidence: 99%

The scandium effect in multicomponent alloys

Riva

Yusenko

Lavery

et al. 2016

International Materials Reviews

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Despite its excellent elemental properties, lightweight nature and good alloying potential, scandium has received relatively little attention in the manufacturing community. The abundance of scandium in the Earth's crust is quite high. It is more abundant than silver, cobalt, lead and tin. But, because scandium is so well dispersed in the lithosphere, it is notoriously difficult to extract in commercial quantities-hence low market availability and high cost. Scandium metallurgy is still a largely unexplored field-but progress is being made. This review aims to summarise advances in scandium metallurgical research over the last decade. The use of scandium as a conventional minor addition to alloys, largely in structural applications, is described. Also, more futuristic functional applications are discussed where details of crystal structures and peculiar symmetries are often of major importance. This review also includes data obtained from more obscure sources (especially Russian publications) which are much less accessible to the wider community. It is clear that more fundamental research is required to elevate the status of scandium from a laboratorybased curiosity to a mainstream alloying element. This is largely uncharted territory. There is much to be discovered.

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Section: Creep Propertiesmentioning

confidence: 99%

The scandium effect in multicomponent alloys

Riva

Yusenko

Lavery

et al. 2016

International Materials Reviews

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“…14) Our earlier work confirmed this suggestion and showed that the dislocations are uniformly distributed in the alloy during secondary creep, and do not tend to form subgrain substructures. 15) Furthermore, the dislocation density of the B2 phase is higher than that of the phase, indicating that the creep deformation of the investigated TiAl-Nb alloy converges primarily in the B2 phase. The second explanation is the effect of oxidation.…”

Section: Creep Propertiesmentioning

confidence: 99%

Effects of High Niobium Addition on the Microstructure and High-Temperature Properties of Ti-40Al-<I>x</I>Nb Alloy

Zhan

Koo

2006

Mater. Trans.

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The effect of Nb content on the microstructure and high-temperature properties of the TiAl alloy with low Al content has been investigated. The as-cast Ti-40Al-10Nb alloy consists of a Widmanstätten lath and a phase in a B2 matrix. The increased addition of Nb to the alloy inhibits the solidification path ! þ . Therefore, the as-cast Ti-40Al-xNb (x ¼ 15; 16) alloys are composed of primary /B2 phases as the major constituent. Following heat treatment, the microstructure of the heat-treated Ti-40Al-10Nb alloy resembles that of the as-cast Ti-40Al-10Nb alloy. The homogenized Ti-40Al-15Nb alloy has a two-phase microstructure of B2 þ , while the homogenized Ti-40Al-16Nb alloy has a fourphase microstructure of B2 þ þ þ . The creep response of the studied TiAl-Nb alloy is correlated closely with the tertiary creep, and is affected strongly by its microstructure. The creep resistance of the alloy depends on the resistance to the propagation of the cracks in the B2 matrix. In the Ti-40Al-15Nb alloy, the resistance to the extending of cracks is the most apparent among these three alloys. Therefore, the Ti40Al-15Nb alloy has the highest creep life of the three tested alloys. The oxidation resistance of the investigated TiAl-Nb alloy is independent of the addition of Nb. The differences among the oxidation resistances of these three alloys arise from their various microstructures. The oxide scales of the Ti-40Al-10Nb alloy are composed mainly of TiO 2 , while the oxide scales formed on the Ti-40Al-15Nb alloy are dense Al 2 O 3 -rich oxides. The Ti-40Al-15Nb alloy has the lowest mass gain among these three alloys due to the existence of the Al 2 O 3 -rich oxides. The formation of Al 2 O 3 -rich oxides appears to be related to the high Nb content of the alloy. The fact that the Ti-40Al-16Nb alloy has the largest weight gain of these three alloys is attributed to the formation of oxide scales of phase.

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