Tensile properties and high temperature creep behavior of microalloyed Ti–Ti3Al–Nb alloys by directional solidification

Luan, Qingdong; Duan, Qiuqi; Wang, Xiaoguang; Liu, Jing; Peng, Leilei

doi:10.1016/j.msea.2010.03.096

Cited by 13 publications

(5 citation statements)

References 56 publications

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“…Internal oxidation of minor Sc additions forms Sc 2 O 3 dispersoids (see Section 'Scandium binary intermetallic phases') but no clear strengthening effect was observed. 151 The benefits of Sc additions to wrought Al −Mg alloys have been shown to produce alloys of high strength, good corrosion resistance and excellent electrical and thermal conductivity. 152 Al−Mg−Sc−Zr alloys produced via powder metallurgy and then extrusion showed the strengthening effect of fine Al 3 (Sc,Zr) particles.…”

Section: Wrought Alloysmentioning

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: Wrought Alloysmentioning

confidence: 99%

The scandium effect in multicomponent alloys

Riva

Yusenko

Lavery

et al. 2016

International Materials Reviews

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“…It is documented that dynamic recrystallization during the creep process could cause an increase in the stress exponent [47][48][49]. Recrystallization is generally accompanied by intense diffusion of solutes, resulting in a refined-grain microstructure and a larger opportunity for grain boundary sliding.…”

Section: Discussionmentioning

confidence: 99%

Intermediate-Temperature Creep Deformation and Microstructural Evolution of an Equiatomic FCC-Structured CoCrFeNiMn High-Entropy Alloy

Cao

Tong

et al. 2018

Entropy

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The tensile creep behavior of an equiatomic CoCrFeNiMn high-entropy alloy was systematically investigated over an intermediate temperature range (500–600 °C) and applied stress (140–400 MPa). The alloy exhibited a stress-dependent transition from a low-stress region (LSR-region I) to a high-stress region (HSR-region II). The LSR was characterized by a stress exponent of 5 to 6 and an average activation energy of 268 kJ mol−1, whereas the HSR showed much higher corresponding values of 8.9–14 and 380 kJ mol−1. Microstructural examinations on the deformed samples revealed remarkable dynamic recrystallization at higher stress levels. Dislocation jogging and tangling configurations were frequently observed in LSR and HSR at 550 and 600 °C, respectively. Moreover, dynamic precipitates identified as M23C6 or a Cr-rich σ phase were formed along grain boundaries in HSR. The diffusion-compensated strain rate versus modulus-compensated stress data analysis implied that the creep deformation in both stress regions was dominated by stress-assisted dislocation climb controlled by lattice diffusion. Nevertheless, the abnormally high stress exponents in HSR were ascribed to the coordinative contributions of dynamic recrystallization and dynamic precipitation. Simultaneously, the barriers imposed by these precipitates and severe initial deformation were referred to so as to increase the activation energy for creep deformation.

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“…Moreover, elemental Cr can strongly increase the thermodynamic driving force for the formation of σ phase [22]. However, the formation of precipitation had not caused breakdown of the traditional power-law with anomalously high stress exponent and activation energy originated from the effect of recrystallization or dislocation-precipitate interaction [ 16,28,29]. In actuality, a high density of precipitated obstacles may promote the annihilation of moving dislocations, and thus no threshold stress was required to overcome precipitation.…”

Section: Microstructural Evolutionmentioning

confidence: 99%

Creep behaviour and microstructural evolution of Al_xCrMnFeCoNi high-entropy alloys

Cao

Tong

et al. 2019

Materials Science and Technology

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The creep deformation behaviour of thermo-mechanically treated Al xCrMnFeCoNi high-entropy alloys was investigated in the high-temperature range of 600–700°C. Compared with the Al-free CrMnFeCoNi alloy, the Al xCrMnFeCoNi alloys showed higher creep resistance under the same creep conditions due to strengthening contribution from elemental Al. The Al0.4CrMnFeCoNi alloy exhibited a stress-dependent transition from the low-stress region to high-stress region. The Al0.6CrMnFeCoNi alloy showed decreased creep resistance compared to the Al0.4CrMnFeCoNi alloy, which was ascribed to the higher activation volume and stacking-fault energy in the former alloy. Specifically, the intragranular formation of Cr-rich σ precipitation was widely found in the matrix grain among testing conditions, indicating a striking atomic diffusion process due to the limited entropic stabilisation in Al-containing CrMnFeCoNi alloys.

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Tensile properties and high temperature creep behavior of microalloyed Ti–Ti3Al–Nb alloys by directional solidification

Cited by 13 publications

References 56 publications

The scandium effect in multicomponent alloys

The scandium effect in multicomponent alloys

Intermediate-Temperature Creep Deformation and Microstructural Evolution of an Equiatomic FCC-Structured CoCrFeNiMn High-Entropy Alloy

Creep behaviour and microstructural evolution of Al_xCrMnFeCoNi high-entropy alloys

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Tensile properties and high temperature creep behavior of microalloyed Ti–Ti3Al–Nb alloys by directional solidification

Cited by 13 publications

References 56 publications

The scandium effect in multicomponent alloys

The scandium effect in multicomponent alloys

Intermediate-Temperature Creep Deformation and Microstructural Evolution of an Equiatomic FCC-Structured CoCrFeNiMn High-Entropy Alloy

Creep behaviour and microstructural evolution of AlxCrMnFeCoNi high-entropy alloys

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Creep behaviour and microstructural evolution of Al_xCrMnFeCoNi high-entropy alloys