Workability and microstructure evolution of Ti–47Al–2Cr–1Nb alloy during isothermal deformation

Huang, Zhaohui

doi:10.1016/j.intermet.2004.07.011

Cited by 14 publications

(5 citation statements)

References 16 publications

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“…So far, many researches have been done on the hot deformation behaviors and microstructure evolution of fully or nearly fully lamellar TiAl alloys, such as Ti45Al-7Nb-0.4W alloy [17], Ti-47Al-2Cr-0.2Mo alloy [18], and Ti47Al-2Cr-1Nb alloy [19] etc. However, little attention was given to study the isothermal deformation behaviors of Mo, V stabilized b phase containing TiAl alloys as well as the inhomogeneous plastic flow.…”

Section: Introductionmentioning

confidence: 99%

High temperature deformation behaviors of Ti-45Al-2Nb-1.5V-1Mo-Y alloy

et al. 2011

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Section: Introductionmentioning

confidence: 99%

High temperature deformation behaviors of Ti-45Al-2Nb-1.5V-1Mo-Y alloy

et al. 2011

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“…The green density was found to be having more effect on the canned forging than the uncanned forging. Although it has been proven that canning of the consolidated material improves the forging process in three ways: (i) forging of the canned consolidated material improves the efficiency of the forging process by constricting the material flow, resulting in a uniform distribution of the material without cracking; (ii) a large height reduction can be achieved by using one step deformation; and (iii) the temperature loss during forging can be reduced, especially if stainless steel is used as canning material [6]. In the present case it was confirmed that the important factor which affects the canned powder compact forging process is the density of the green compact, it is expected that the increase in the density of the green compact will result in a uniform material flow, which in turn assists the deformation process.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Behaviour of Titanium, Ti-6Al-4V (wt %) Alloy and Ti-47Al-2Cr (at %) Alloy Produced Using Powder Compact Forging

Nadakuduru

Zhang

Raynova

et al. 2011

AMR

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Powder compact forging was used to produce bulk consolidated titanium and Ti-6Al-4V (wt %) and Ti-47Al-2Cr (at%) alloy disks from hydrogenated and dehydrogenated (HDH) and gas atomised powders (GA) powders (in the case of titanium and Ti-6Al-4V) and a mechanically milled powder (in the case of Ti-47Al-2Cr alloy). The bulk titanium and Ti-6Al-4V (wt %) alloy have been produced by forging of the powder compacts. The Ti-47Al-2Cr (at %) alloy was produced using canned powder compact forging of a Ti/Al/Cr composite powder. The purpose of the present study is to investigate the deformation and fracture behaviour of the bulk consolidated as-forged materials, by conducting tensile testing at room temperature (RT) and examination of the fractured specimens which had near-α, α + β and  phase structures, respectively. It was found that as-forged bulk titanium disk produced using HDH powder showed a yield point with a yield strength of ~700 MPa and with a considerable amount of ductility. While the as-forged Ti-6Al-4V (wt %) alloy produced using HDH powder, fractured prematurely without any yielding. On the other hand yielding was observed in the as-forged Ti-6Al-4V (wt %) alloy produced using GA powder, showing a yield strength of ~970 MPa and a considerable amount of plastic strain to fracture. The bulk consolidated Ti-47Al-2Cr (at %) alloy also fractured prematurely with fracture strength of ~125 MPa. The mechanical behaviour of the as-forged bulk materials was found to be dependent on several factors such as initial powders used, green density of the powder compact, forging parameters used during forging. It was expected that the entrapped gas in green compacts, absorbed oxygen, porosity and inter-particle bonding play an important role on the quality of the as-forged material, which in turn affected the mechanical behaviour of the bulk material.

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“…For high-NbTiAl alloy, the inhomogeneous microstructure and solute segregation (S, β, and α segregation) have been indicated in as-cast TiAl ingots [17,18]. Simultaneously, the solute addition has significant effects on stacking fault energy of TiAl alloy, which may promote complex interactions between local flow and the recrystallization process during pack rolling process [19][20][21][22]. So far, little attention has been focused on obtaining the fine and homogeneous microstructures of high-NbTiAl alloys by optimizing the package configuration and deformation parameters during hot pack rolling.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Hot-Pack Coating Materials on the Pack Rolling Process and Microstructural Characteristics during Ti-46Al-8Nb Sheet Fabrication

Huang

Liao

et al. 2020

Materials

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The effects of the package materials on the hot workability and stress-strain characteristics of high-Nb TiAl alloy with a nominal composition of Ti-46Al-8Nb (in at.%) were systematically studied via “sandwich structure” hot compression. TiAl sheet fabrication was conducted by hot pack rolling, and the microstructural characteristics and deformation mechanisms were investigated. Based on the analysis of compressed samples and stress-strain curves, the stainless steel/TiAl structure showed better deformation compatibility with homogeneous deformation and decreasing resistance. However, severe interfacial reactions were inevitable. Meanwhile, for the titanium alloy/TiAl structure, few interfacial reactions happened, but wavy deformation and high resistance complicated the compression process. Finally, a package structure with an outer stainless steel isolation layer and inner titanium alloy was determined for the pack rolling process. A TiAl sheet with no crack defects was obtained with 80% reduction. The pack-rolled TiAl sheet took on alternate microstructure of the grain-boundary Al-enriched ribbons and elongated lamellar colonies ribbons. The grain-boundary recrystallized α2 phase, lumpy γ phase, and massive α2/γ lamellae could be observed, which led to the scatter microstructure. The microstructural characteristics mainly resulted from the solute segregations of as-cast Ti-46Al-8Nb alloys, which triggered the local flow softening and deformation incompatibility during hot pack rolling.

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Workability and microstructure evolution of Ti–47Al–2Cr–1Nb alloy during isothermal deformation

Cited by 14 publications

References 16 publications

High temperature deformation behaviors of Ti-45Al-2Nb-1.5V-1Mo-Y alloy

High temperature deformation behaviors of Ti-45Al-2Nb-1.5V-1Mo-Y alloy

Mechanical Behaviour of Titanium, Ti-6Al-4V (wt %) Alloy and Ti-47Al-2Cr (at %) Alloy Produced Using Powder Compact Forging

The Effects of Hot-Pack Coating Materials on the Pack Rolling Process and Microstructural Characteristics during Ti-46Al-8Nb Sheet Fabrication

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