Effect of heat treatment and hot isostatic pressing on void density and fracture mode of Al67Ni8Ti25

Mysko, D.D.; Lumsden, J. B.; Powers, W. O.; Wert, J. A.

doi:10.1016/0036-9748(89)90465-1

Cited by 25 publications

(4 citation statements)

References 7 publications

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“…If Al is the only diffusion species, which is proved by van Loo's work [19], vacancies will form in the Al layer, which later condense to voids. This kind of void is a so-called Kirkendall void [29]. This theory can explain void formation in the Al layer but not in the TiAl 3 layer.…”

Section: Tial 3 Formationmentioning

confidence: 94%

Synthesis of γ-TiAl foils and sheets by innovative reactive diffusion methods from elemental Ti and Al

Zhang

2010

Intermetallics

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Section: Tial 3 Formationmentioning

confidence: 94%

Synthesis of γ-TiAl foils and sheets by innovative reactive diffusion methods from elemental Ti and Al

Zhang

2010

Intermetallics

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“…It is well known that the plastic strain is proportional to the density of generated (mobile) dislocations according to ε ϭ bx [9] p p where p ϭ the density of generated dislocations, b ϭ the magnitude of Burgers vector, and x ϭ the mean slip path of dislocations. [9] and [10], one obtains 1 2 ⌬ ϭ constxε [11] WH p substituting into Eq. Combining Eqs.…”

Section: B Work Hardening and Microhardnessmentioning

confidence: 99%

“…[2,3] Some authors reported significant ductilities of the Ll 2 titanium trialuminides in compression. [9] However, since most of the Ll 2 titanium trialuminides develop porosity during casting and/or Kirkendall porosity during subsequent homogenization, [7,10,11] it is important to understand the re-lationship between porosity and mechanical behavior of these materials, which may shed some light on the causes of their brittleness. It is shown that the compressive deformation of the Ll 2 titanium trialuminides is accompanied by a continuous development of internal microcracking.…”

Section: Introductionmentioning

confidence: 99%

The effect of hydrostatic pressurization on the microhardness and compressive behavior of the porous Mn-Modified Ll2 titanium trialuminide

Witczak

Varin

1997

Metall Mater Trans A

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Microhardness and compressive mechanical properties of the Mn-modified Ll 2 titanium trialuminide containing porosities from 0.07 to 0.14 and a small volume fraction of the Al 3 Ti particles were studied after hydrostatic pressurization at 2 GPa. It is found that the reduction in porosity after hydrostatic pressurization (densification) increases approximately linearly with increasing initial porosity. Compressive yield strength, strength to fracture, and permanent deformation to fracture of both unpressurized and pressurized material decrease linearly with increasing actual volume fraction of porosity. At the same level of actual porosity, the compressive yield strength of the hydrostatically pressurized Ll 2 titanium trialuminide is always higher and its permanent deformation to fracture is always lower than that of the unpressurized titanium trialuminide. Such a behavior indicates that the pressure-induced dislocations generated at elastic discontinuities such as pores and the Al 3 Ti particles become immobilized. This, in turn, leads to a quick work hardening. The behavior of compressive yield strength of the hydrostatically pressurized Ll 2 titanium trialuminide is opposite to that observed for a B2 NiAl intermetallic hydrostatically pressurized to 1.4 GPa and subsequently compressive and tensile tested by Margevicius and Lewandowski. This difference is discussed in terms of different crystallographic structure of titanium trialuminides (Ll 2 ) and NiAl (B2).

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“…Recently, much work has been made on the microstructure, especially on the role of second phases and porosities generally induced by the homogenization treatment, and also on the microstructure-mechanical property relationships of the ternary L1 2 trialuminide compounds. [12][13][14][15][16] Ti-67Al-8Cr alloy with L1 2 structure especially possesses intrinsic bend ductility at ambient temperature to some extent, and Ti-61Al-14Cr and Ti-61Al-13Cr alloys are more ductile in bending with a plastic strain of 0.9%. More interestingly, no porosities were observed after homogenization in these higher Cr content alloys.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of L12-(Al, Cr)3Ti/Ti2AlC Composites Prepared by Combustion Synthesis

et al. 2002

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L1 2 -(Al, Cr) 3 Ti/Ti 2 AlC composites have been prepared by the reactive arc-melting technique using elemental powders of Ti, Al, Cr, and C. Resulting composites have been reinforced using 4.5, 9, and 18 vol%Ti 2 AlC in a matrix of L1 2 trialuminide Ti-61 mol%Al-13 mol%Cr alloy. The Ti 2 AlC particles having a rod-like morphology of 1.5 µm width and 5-20 µm in length were homogeneously dispersed in the matrix. The matrix grain size was reduced through addition of Ti 2 AlC particles. These composite materials have revealed higher mechanical properties (bending strength and fracture toughness) than that of the monolithic alloy. This improvement is attributed to the Ti 2 AlC particles dispersion and to the fine grain of the matrix.

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Effect of heat treatment and hot isostatic pressing on void density and fracture mode of Al67Ni8Ti25

Cited by 25 publications

References 7 publications

Synthesis of γ-TiAl foils and sheets by innovative reactive diffusion methods from elemental Ti and Al

Synthesis of γ-TiAl foils and sheets by innovative reactive diffusion methods from elemental Ti and Al

The effect of hydrostatic pressurization on the microhardness and compressive behavior of the porous Mn-Modified Ll2 titanium trialuminide

Microstructure and Mechanical Properties of L1<SUB>2</SUB>-(Al, Cr)<SUB>3</SUB>Ti/Ti<SUB>2</SUB>AlC Composites Prepared by Combustion Synthesis

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