Structure and stability of precipitates in 500°C exposed Ti–25V–15Cr–xAl alloys

Li, Y.G.; Blenkinsop, P. A.; Loretto, M. H.; Walker, N. A.

doi:10.1016/s1359-6454(98)00238-9

Cited by 20 publications

(9 citation statements)

References 6 publications

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“…Therefore, Ti-30Ta-1Al alloy exhibited a stable high-temperature shape memory effect during thermal cycling. Li [19] studied the structure and the stability of the precipitates in 500 °C exposed Ti-25V-15Cr-xAl alloys. When the Al content varied from 2 wt% to 4 wt%, the precipitation increased and the kinetics of α to α2 ordering moved fast.…”

Section: α-Stabilizing Elementsmentioning

confidence: 99%

Recent Development of Effect Mechanism of Alloying Elements in Titanium Alloy Design

Zhao

2014

Rare Metal Materials and Engineering

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The properties of titanium alloy are determined by the chemical composition and microstructure, and the sorts of alloying elements are the main concerns in alloy design. Titanium can be alloyed with various elements to alter its properties, such as high-temperature performance, creep resistance and formability etc. The main objective of this work is to discuss the effect of alloying elements for processing improvement, microstructure optimization and the alloying principle which should be paid attention to in titanium alloy design. Some problems in new alloy design are also discussed and summarized, especially on the interaction of different alloying elements, which leads to the misfit or misorientation dislocations. The interrelationships between alloying composition, phase stability, microstructure and mechanical properties in several classical titanium alloys are critically reviewed.

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Section: α-Stabilizing Elementsmentioning

confidence: 99%

Recent Development of Effect Mechanism of Alloying Elements in Titanium Alloy Design

Zhao

2014

Rare Metal Materials and Engineering

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“…Ti25V15Cr2Al0?2C (BuRTi) represents a family of burn resistant titanium alloys developed in the 1990s. 1,2 The propensity for titanium fire in these b phase alloys has been reduced through large additions of chromium and vanadium. Extruded BuRTi has been well studied 3,4 and is now being engine tested.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of hot isostatically pressed powder and extruded Ti25V15Cr2Al0·2C

Jiang

Zhang

García-Pastor

et al. 2011

Materials Science and Technology

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The influence of process route on the microstructure and tensile behaviour of specimens prepared from hot isostatically pressed powders and extruded ingot of the burn resistant alloy, Ti-25V-15Cr-2Al-0?2C (wt-%), has been investigated. Samples based on gas atomised (GA) and plasma rotating electrode process (PREP) powders have been studied. Microstructural examination shows that many PREP powder particles are single crystals, whereas GA particles are polycrystalline. The mechanical properties of hot isostatically pressed specimens have been assessed using tensile testing monitored by acoustic emission, while microstructures have been characterised by synchrotron X-ray microtomography and optical and analytical scanning electron microscopy. Tomographic examination revealed a small fraction (,0?002 vol.-%) of pores in samples made from hot isostatically pressed GA powders, but no porosity was detected in samples made from hot isostatically pressed PREP powder. In view of their similar tensile behaviour, it is concluded therefore that the porosity does not contribute to the scatter and poor ductility in these hot isostatically pressed samples. These pores increased in size and volume fraction after heat treatment above the hot isostatic press temperature. The large scatter in tensile properties of both hot isostatically pressed GA and PREP samples was correlated with the presence of large (100-400 mm) circular crack initiation sites on the fracture surfaces, but the origin of these initiation sites has not been identified.

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“…The removal of oxygen reduces alpha precipitation dramatically at grain boundaries, which results in a significant improvement in ductility. [2][3][4][5] A good solution to prevent titanium fire is to tip conventional alloy blades with a nonburning Ti alloy to prevent ignition of the blade if rubbing were to occur, as shown in Figure 1. Conventional welding such as tungsten inert gas (TIG) could be used for blade tipping, but the large heat source and large molten pool makes it difficult to control the dimensional precision especially at leading and trailing edges of blades.…”

Section: Introductionmentioning

confidence: 99%

Direct Laser Fabrication of Ti-25V-15Cr-2Al-0.2C (wt pct) Burn-Resistant Titanium Alloy

Wang

2011

Metall Mater Trans A

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Direct laser fabrication has been used to deposit multilayers of burn-resistant titanium alloy onto the surface of Ti697 (Ti-11Sn-5Zr-2.25Al-0.25Si) alloy by feeding Ti-25V-15Cr-2Al-0.2C (wt pct) powder into the laser molten pool. The microstructure and mechanical properties of the deposited layers have been studied to identify the importance of laser conditions on properties/ microstructure. The observations are discussed in terms of the optimum laser conditions and thus the potential of using BuRTi (Ti-25V-15Cr-2Al-0.2C) to tip blades of high-temperature titanium alloys to provide burn resistance.

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Structure and stability of precipitates in 500°C exposed Ti–25V–15Cr–xAl alloys

Cited by 20 publications

References 6 publications

Recent Development of Effect Mechanism of Alloying Elements in Titanium Alloy Design

Recent Development of Effect Mechanism of Alloying Elements in Titanium Alloy Design

Microstructure and properties of hot isostatically pressed powder and extruded Ti25V15Cr2Al0·2C

Direct Laser Fabrication of Ti-25V-15Cr-2Al-0.2C (wt pct) Burn-Resistant Titanium Alloy

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