Fabrication and toughening of NbCr2 matrix composites alloyed with Ni obtained by powder metallurgy

Nie, Xiao-wu; Lu, Shiqi; Wang, Kelu; Tong-cai, Chen; Niu, Chunlin

doi:10.1016/j.msea.2008.10.004

Cited by 25 publications

(4 citation statements)

References 24 publications

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“…Moreover, ALCHEMI revealed preference of Ti for the A sites and V, Mo, W, Ti for the B sites [98]. Phase compositions of Laves phases in further ternary Nb-Cr-C systems indicate that C = Fe [99], Co [100,101] and Ni [102] substitute Cr on the B sites, where the former two systems also form Laves phases NbC 2 . Information about many other elements can be obtained for elements from the shape of the homogeneity ranges.…”

Section: Stability and Site Preferencementioning

confidence: 99%

“…A multitude of studies were undertaken to find if and how the mechanical behavior of single-phase Laves phases, especially the room-temperature fracture toughness, changes by compositional deviations from the ideal AB 2 stoichiometry (see, for example, [151, 364, 368, 380-382, 384, 386, 393, 394, 621]) or by substitutional replacement of the A or B metal by alloying additions (see, for example, [89,102,148,361,[621][622][623][624][625]). There was also a theoretical attempt to predict which element addition should be most effective in enhancing the fracture toughness.…”

Section: Figure 28mentioning

confidence: 99%

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Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

2020

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Laves phases with their comparably simple crystal structure are very common intermetallic phases and can be formed from element combinations all over the periodic table resulting in a huge number of known examples. Even though this type of phases is known for almost 100 years, and although a lot of information on stability, structure, and properties has accumulated especially during the last about 20 years, systematic evaluation and rationalization of this information in particular as a function of the involved elements is often lacking. It is one of the two main goals of this review to summarize the knowledge for some selected respective topics with a certain focus on non-stoichiometric, i.e., non-ideal Laves phases. The second, central goal of the review is to give a systematic overview about the role of Laves phases in all kinds of materials for functional and structural applications. There is a surprisingly broad range of successful utilization of Laves phases in functional applications comprising Laves phases as hydrogen storage material (Hydraloy), as magneto-mechanical sensors and actuators (Terfenol), or for wear- and corrosion-resistant coatings in corrosive atmospheres and at high temperatures (Tribaloy), to name but a few. Regarding structural applications, there is a renewed interest in using Laves phases for creep-strengthening of high-temperature steels and new respective alloy design concepts were developed and successfully tested. Apart from steels, Laves phases also occur in various other kinds of structural materials sometimes effectively improving properties, but often also acting in a detrimental way.

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Section: Stability and Site Preferencementioning

confidence: 99%

Section: Figure 28mentioning

confidence: 99%

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

2020

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“…Microcracking in single phase HA has been confirmed by Case et al [99]. Pre-existing microcracks from TEA may in turn affect the indentation crack behavior via crack branching [101,102] and by lowering the local [103] as well as the global [104] elastic modulus.…”

Section: Perturbation From Lateral Cracksmentioning

confidence: 81%

Slow growth of microcracks in hydroxyapatite during aging

2012

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Hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 or HA) is a brittle material that is subject to environmentally assisted slow crack growth. While most slow crack growth studies are carried out after aging, this study examines the slow growth of radial cracks induced by Vickers indentation in dense HA (94 % of theoretical density) during aging in ambient air, where the observed crack growth is consistent with a process in which residual stress drives crack growth. For indentation loads of 0.98, 1.96, 2.94, and 4.91 N, the average radial crack length increased exponentially with time for indentation loads of 0.98, 1.96, 2.94, and 4.91 N, with crack lengths saturating within 1 h following indentation. However, no radial crack growth was observed for 9.81 N loads. The load dependence of radial crack growth is proposed to be linked to the partitioning of residual strain energy by the lateral crack growth, which has not been reported in the literature.

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“…An intermetallic compound is classified as a Laves phase purely on the basis of the geometry of the crystal structure. The Laves phases crystallize in three structure types: cubic MgCu 2 (C15), hexagonal MgZn 2 (C14) and hexagonal MgNi 2 (C36) [1][2][3][4]. An orthorhombic structure also exists where are observed a number of AB 2 intermetallics, namely the CeCu 2 -type structure.…”

Section: Introductionmentioning

confidence: 99%

First-principles study of structural and electronic properties of Laves phases structures YM₂(M = Cu and Zn)

Benabadji¹,

Faraoun²

2013

MATEC Web of Conferences

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Abstract. First-principles calculations have been carried out to investigate the structural properties and electronic structure of the main binary Laves phase YCu 2 and YZn 2 with C14, C14, C36 and CeCu 2 structures in Cu-Y-Zn alloy, respectively. The total energies of Laves phases with various occupations of nonequivalent lattice sites in all four structural forms have been calculated Ab initio by a pseudopotential VASP code. The optimized structural parameters were in very good agreement with the experimental values. The calculated heat of formation showed that the CeCu 2 -YCu 2 and YZn 2 Laves phase was of the strongest alloying ability and structural stability. The electronic density of states (DOS) and charge density distribution were given.

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Fabrication and toughening of NbCr2 matrix composites alloyed with Ni obtained by powder metallurgy

Cited by 25 publications

References 24 publications

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

Slow growth of microcracks in hydroxyapatite during aging

First-principles study of structural and electronic properties of Laves phases structures YM₂(M = Cu and Zn)

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Fabrication and toughening of NbCr2 matrix composites alloyed with Ni obtained by powder metallurgy

Cited by 25 publications

References 24 publications

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

Slow growth of microcracks in hydroxyapatite during aging

First-principles study of structural and electronic properties of Laves phases structures YM2(M = Cu and Zn)

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Product

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First-principles study of structural and electronic properties of Laves phases structures YM₂(M = Cu and Zn)