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3 edition of Ductility and fracture in B2 FeAL alloys found in the catalog.

Ductility and fracture in B2 FeAL alloys

Ductility and fracture in B2 FeAL alloys

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  • 38 Currently reading

Published by Case Western Reserve University, For sale by the National Technical Information Service in Cleveland, Ohio, [Springfield, Va .
Written in English

    Subjects:
  • Metallurgy.

  • Edition Notes

    StatementMartin A. Crimp.
    SeriesNASA contractor report -- 180810., NASA contractor report -- NASA CR-180810.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15280519M

    The uniaxial tensile properties of a B2 Fe–40Al based alloy containing at.% carbon and at.% boron have Ductility; Fracture 1. Introduction The physical and mechanical properties of binary FeAl with the B2 structure existing over a range of compositions skewed to the Al-deficient side have been extensively studied and the results. ). The effect of the B2 phase content on strength, and ductility of alloys in this system is shown in figure 8. In view of the well-known effects of grain size on cleavage fracture stress in metals and alloys, it is also clear that the size of Ti3Al or .

    The research consisted of investigations on the microstructure, tensile behavior, deformation, and fracture mechanisms of the DO 3 and B2 ironaluminides. Binary Fe-Al alloys with a wide range of Al contents, solidsolution ternary alloys and precipitation- and dispersion-strengthened two-phase alloys have been investigated. TABLE 4 Rapid Solidification of Aluminides Alloys Method Remarks Reference Ni-Al-X Ni3Al-B FeAl-borides Fe at% Al Fe at% Al Ni3Al-B Fe3Al-TiB2 Melt spin Arc hammer Melt spin & PM RSR RSR Melt spin RSR Ductile at 25°C, unstable at °C Ductile Brittle to °C TG at 25°C, IG at °C Inoue et al. Liu and Koch Ray.

    Ordered intermetallics based on transition metal aluminides have been proposed as structural materials for advanced aerospace applications. The development of these materials, which have the advantages of low density and high operating temperatures, have been focused on the aluminides of titanium, nickel and iron. Though these materials exhibit attractive properties at . The Fe at.% Al alloy was studied in this article. The aim was to describe the influence of gas atomized powder pre-milling before SPS (Spark Plasma Sintering) sintering on the structure and properties of the bulk materials. The initial powder was milled for , 1, and 8 h. It was proven that 1 h milling leads to the change in size and morphology of the particles, B2→A2 phase.


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Ductility and fracture in B2 FeAL alloys Download PDF EPUB FB2

Get this from a library. Ductility and fracture in B2 FeAL alloys. [Martin A Crimp; United States. National Aeronautics and Space Administration.]. This paper reviews the deformation, fracture and alloy design of B2 iron aluminides based on FeAl.

Moisture-induced environmental embrittlement is shown to be a leading cause of low tensile ductility and brittle cleavage fracture of Ferich FeAl alloys at ambient by: Iron aluminides with the composition FeAl-5XBZr (at. %), where X stands for the first row transition metals Ti, V, Cr, Mn, Fe, Co, Ni, Cu, were examined at room temperature with respect to their strength, ductility, environmental sensitivity, and fracture by: 5.

Abstract. An illustration of L1 2 and B2 structures and their description is the subject of this chapter. It is intended to make the reader familiar with the iron-based A 3 B and AB compounds. The A 3 B compounds of this group are known as the L1 2 structures while the AB compounds are the B2 structures.

Among the L1 2 structures the Ni 3 Al, Ni 3 Ga, Ni 3 Ge, Co 3 Ga, and. This paper reports that the Ductility and fracture in B2 FeAL alloys book temperature fracture behavior of the B2 compounds FeAl and NiAl has been examined as a function of alloy stoichiometry.

In tension tests, iron-rich FeAl. FeAl alloys tested in air at room temperature shows a cleavage fracture and % tensile elongation.

The same alloy tested in conventional vacuum had a ductility of about 8%. FeAl alloys tested in a dry oxygen environment exhibited tensile ductility as high as 18%. Iron aluminides fracture mainly by {} type cleavage when tested in moisture. This paper reviews the deformation, fracture and alloy design of B2 iron aluminides based on FeAl.

Moisture-induced environmental embrittlement is shown to be a leading cause of low tensile ductility and brittle cleavage fracture of Ferich FeAl alloys at ambient temperatures.

With increasing Al concentration, two other factors, namely intrinsic grain-boundary weakness and. The effects of environment on the tensile ductility and fracture toughness of Feat.%Al and Feat.%Al are investigated.

Room-temperature fracture toughness of the iron aluminides investigated in air ranged between 35 and 40 MPa m 1/2, significantly higher than those of many ordered intermetallic alloys.A significant effect of environment is observed on the tensile ductility and fracture. @article{osti_, title = {Effect of boron on tensile properties of B2 FeAl}, author = {Crimp, M and Vedula, K}, abstractNote = {Small additions of boron improve the room temperature ductility of Ni/sub 3/Al, possibly owing to B segregation to grain boundaries.

This study was undertaken to see if boron has a similar effect on the low temperature tensile properties of FeAl. Third element additions may improve room temperature ductility and/or increase elevated temperature strength, which is desirable for application of the FeAl alloy.

Early studies showed that the B2 FeAl alloy undergoes a transition in slip vector, from 〈〉 to 〈〉, with increasing temperature 6, 16, 23, @article{osti_, title = {Ductile fracture and ductility}, author = {Dodd, B.

and Bai, Y.}, abstractNote = {To obtain a fundamental understanding of ductile fracture and ductility it is necessary that engineers and metallurgists work together closely.

This book is written by scientists from each of these disciplines and thus takes a unified approach to the subject. In tension tests, iron-rich FeAl was shown to be ductile whereas the stoichiometric alloy is brittle.

In contrast, stoichiometric NiAl shows ductility but off-stoichiometric compositions are brittle. @article{osti_, title = {Environmental and strain rate effects on the ductility and yield strength of FeAl}, author = {Pike, L M and Liu, C T}, abstractNote = {The environmental embrittlement in FeAl is sensitive to strain rate.

For instance, the ductility of FeAl has been shown to increase with increasing strain rates. This can be attributed to one of several time. On the crack growth resistance and strength of the B2 iron aluminides FeAl, FeAl, and FeNiAl (at.

@article{osti_, title = {Ductility and fracture behavior of polycrystalline Ni/sub 3/Al alloys}, author = {Liu, C.T.}, abstractNote = {This paper provides a comprehensive review of the recent work on tensile ductility and fracture behavior of Ni/sub 3/Al alloys tested at ambient and elevated temperatures.

Polycrystalline Ni/sub 3/Al is intrinsically brittle along grain boundaries. Atypical Defects in a B2 FeAlCB Alloy; Processing and Properties of FeAl Sheets Obtained by Roll Compaction and Sintering of Water Atomized Powder; Ductility and Fracture of FeAl: Effects of Composition and Environment; High Temperature Corrosion of Spray-Atomized FeAl (40at%) Based Alloys Immersed in a Molten Salt Mixture of V2O5-Na2SO4.

At room temperature, the tensile strength of the as-extruded alloy was MPa and the tensile ductility was %, demonstrating a good combination of high strength and ductility.

The B2-L21 ordering transitions in Au-Cu-Al shape-memory alloys are studied by the Monte Carlo exchange simulations, where a set of the first. It has been shown that it is possible to obtain significant room temperature tensile ductility in FeAl alloys using iron-rich deviations from stoichiometry.

A comparison of the room temperature tensile and compressive behaviors of Fe at. pct Al and Fe at. pct Al shows that FeAl is brittle at higher Al contents because it fractures along. defects, free surface energies and various grain boundary structures of similar energies in three B2 compounds, FeAl, NiAl and CoAl were studied.

These B2 alloys exhibited increasing anti-phase boundary energies respectively. The misorientations chosen for detailed study correspond to the 5() and 5() boundaries. Cao, G. H. et al. Determination of slip systems and their relation to the high ductility and fracture toughness of the B2 DyCu intermetallic compound.

Acta Mater. 55, – ().s.1–7 The crack in FeAl propagates mainly along the {} plane in air. In contrast, in a vacuum, fracture occurs along {} for stoichiometricFe–Al,{} for Fe–40Al, andFe–35Al.2,3 The ductility of Fe–40Al single-slip-oriented single crystals is lower in air than in a vacuum.5 Screw oriented single crystals of Fe.°C [15].

Base binary FeAl alloy compositions ranging from at.% AI showed that alloys with at.% had good high-temperature ductility (Fig.

la), but that alloys with at.% AI had the best resistance to molten salt corrosion at °C (Fig. Ib). Examination of the fracture mode indicated that FeAl alloys with.