Mechanical behavior and advanced processing of nano- and submicron-grained intermetallic compounds based on γ-TiAl

Bohn, Rainer; Fanta, G.; Klassen, Thomas; Bormann, R.

doi:10.1016/s1359-6462(01)00718-7

Cited by 4 publications

(1 citation statement)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The absence of high plasticity at fabrication temperatures is also a source of difficulties, in particular, in rolling TiAl into thin sheets or foils. Previous research has suggested that by refining the grains of the alloys to ultrafine grained (UFG) (grain sizes in the range of 100-500nm) or nanocrystalline levels (grain sizes in the range of 2-100nm) this limitation may be overcome [1][2][3][4][5][6]. However the key of realizing the promising potential of UFG and nanostructured TiAl based alloys is to develop processes and establishing optimised processing A c c e p t e d M a n u s c r i p t conditions for producing high quality bulk materials containing a very low level of structural defects such as residual pores and prior interparticle boundaries that were not bonded.…”

Section: Introductionmentioning

confidence: 99%

The mechanical behaviour of an ultrafine grained Ti–47Al–2Cr (at%) alloy in tension and compression and at different temperatures

Nadakuduru

Zhang

Cao

et al. 2011

Materials Science and Engineering: A

View full text Add to dashboard Cite

A c c e p t e d M a n u s c r i p t Research Highlights Powder metallurgy process has been used to produce UFG Ti-47Al-2Cr (at%) alloy. At room temperature, the UFG alloy was found to be ductile in compression (~ 4%). At elevated temperatures the alloy showed high tensile and compressive ductility. The yield strength at 900 o C is 55MPa in tension and ~ 33MPa in compression. *Research HighlightsPage 2 of 17 A c c e p t e d M a n u s c r i p t AbstractA bulk ultrafine grained (UFG) Ti-47Al-2Cr (at%) alloy has been produced using a powder metallurgy process that combines high energy mechanical milling (HEMM) of a mixture of Ti, Al and Cr powders to produce a Ti/Al/Cr composite powder and hot isostatic pressing (HIP) of the composite powder compact. The purpose of the present study is to determine the mechanical behaviour of the alloy in tension and compression at room temperature (RT) and elevated temperatures, and also to compare the compression behaviour of the material with its tensile behaviour. It has been found that due to the residual pores, lack of full level interparticle bonding and high oxygen content (0.87wt%) in the consolidated samples, the UFG TiAl based alloy has a very low room temperature tensile fracture strength of ~100MPa and shows no tensile ductility. However these microstructural defects and high oxygen content have much less significant effect on the room temperature compressive mechanical properties, and the alloy shows a high compressive yield strength of ~ 1410 MPa, and some ductility (plastic strain to fracture ~ 4%). At elevated temperatures of 800 o C and above, the alloy shows high tensile and compressive ductility as demonstrated by 75% tensile elongation to fracture and no cracking in upset forging with a height reduction of 50% at 900 o C. The yield strength of the alloy at 900 o C is 55MPa in tension and ~ 33MPa in compression, both of which are lower than those of coarse grained TiAl based alloys with similar compositions at 900 o C. This is due to a higher creep rate of the UFG alloy caused by the small grains. The good formability of the UFG TiAl based alloy as reflected by the lower critical temperature above which the alloy becomes highly formable indicates that the material can be used as a suitable precursor for secondary thermomechanical processing and super-plastic forming.

show abstract

Section: Introductionmentioning

confidence: 99%

The mechanical behaviour of an ultrafine grained Ti–47Al–2Cr (at%) alloy in tension and compression and at different temperatures

Nadakuduru

Zhang

Cao

et al. 2011

Materials Science and Engineering: A

View full text Add to dashboard Cite

show abstract

Al-Si-Ti (Aluminium - Silicon - Titanium)

2006

Landolt-Börnstein - Group IV Physical Chemistry

View full text Add to dashboard Cite

Tailoring nanocrystalline materials towards potential applications

Klassen

Bohn

Fanta

et al. 2003

International Journal of Materials Research

View full text Add to dashboard Cite

The high interface area in nanocrystalline materials leads to advanced structural and functional properties that are interesting for a variety of applications and products. Three distinct examples for potential applications are given: Nanocrystalline and submicron-sized light-weight intermetallics based on γ-TiAl exhibiting favourable deformation behaviour at reduced temperatures, nanocrystalline cermet coatings produced by thermal spray process exhibiting improved hardness and wear resistance, and nanocrystalline Mg hydride-based composites for hydrogen storage in future mobile applications exhibiting extremely high, reversible storage capacity and fast kinetics.

show abstract

Mechanical behavior and advanced processing of nano- and submicron-grained intermetallic compounds based on γ-TiAl

Cited by 4 publications

References 3 publications

The mechanical behaviour of an ultrafine grained Ti–47Al–2Cr (at%) alloy in tension and compression and at different temperatures

The mechanical behaviour of an ultrafine grained Ti–47Al–2Cr (at%) alloy in tension and compression and at different temperatures

Al-Si-Ti (Aluminium - Silicon - Titanium)

Tailoring nanocrystalline materials towards potential applications

Contact Info

Product

Resources

About