Optical Constants of β-Phase NiAl

Rechtien, James J.; Kannewurf, Carl R.; Brittain, J. O.

doi:10.1063/1.1710060

“…7o -72 In addition to information on bonding, the optical constants of NiAI have been measured as a function of composition between 45·2 and 61·6 at.-%Ni by Rechtien et al 70 and as a function of alloying addition by Jacobi and Stahl. 71 Rechtien et al 70 and Jacobi et al 62 further noted that the visible colour of NiAI was very dependent on composition, appearing bright blue for near stoichiometric compositions to yellow or bronze for Ni-rich compositions and silver grey for Al-ricp.…”

Section: Thermodynamic Properties and Phase Stabilitymentioning

confidence: 99%

Physical and mechanical properties of the B2 compound NiAl

Noebe¹,

Bowman²,

Nathal³

1993

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Considerable work has been performed on N iAI over the past three decades, with rapid growth in research on this intermetallic occurring in the past few years because of recent interest in this material for electronic and high temperature structural applications. However, many physical properties and the controlling fracture and deformation mechanisms over certain temperature regimes are still debated. This is due in part to the incomplete characterisation of many of the alloys previously investigated. Fragmentary data on processing conditions, chemistry, microstructure, and the apparent difficulty in accurately measuring composition have made direct comparison between individual studies sometimes tenuous. The purpose of this review is to summarise all available mechanical and pertinent physical properties of NiAI, stressing the most recent investigations, in an attempt to understand the behaviour of NiAI and its alloys over a broad temperature range.1MR/247

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“…7o -72 In addition to information on bonding, the optical constants of NiAI have been measured as a function of composition between 45·2 and 61·6 at.-%Ni by Rechtien et al 70 and as a function of alloying addition by Jacobi and Stahl. 71 Rechtien et al 70 and Jacobi et al 62 further noted that the visible colour of NiAI was very dependent on composition, appearing bright blue for near stoichiometric compositions to yellow or bronze for Ni-rich compositions and silver grey for Al-ricp. alloys.…”

Section: Thermodynamic Properties and Phase Stabilitymentioning

confidence: 99%

Physical and mechanical properties of the B2 compound NiAl

Noebe¹,

Bowman²,

Nathal³

1993

International Materials Reviews

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Considerable work has been performed on N iAI over the past three decades, with rapid growth in research on this intermetallic occurring in the past few years because of recent interest in this material for electronic and high temperature structural applications. However, many physical properties and the controlling fracture and deformation mechanisms over certain temperature regimes are still debated. This is due in part to the incomplete characterisation of many of the alloys previously investigated. Fragmentary data on processing conditions, chemistry, microstructure, and the apparent difficulty in accurately measuring composition have made direct comparison between individual studies sometimes tenuous. The purpose of this review is to summarise all available mechanical and pertinent physical properties of NiAI, stressing the most recent investigations, in an attempt to understand the behaviour of NiAI and its alloys over a broad temperature range.1MR/247

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“…Ellipsometry measurements and DFT calculations usually yield the complex dielectric function ðxÞ from which the absorption coefficient a ¼ l À1 and the reflectivity R can be computed by standard electrodynamic relations. The results using data from [33][34][35] are given in Table 3.…”

Section: Electronic and Optical Parametersmentioning

confidence: 99%

Laser ablation of Al–Ni alloys and multilayers

Roth

¹

,

Trebin

²

,

Kiselev

³

et al. 2016

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Laser ablation of Al-Ni alloys and multilayers has been studied by molecular dynamics simulations. The method was combined with a two-temperature model to describe the interaction between the laser beam, the electrons, and the atoms. As a first step, electronic parameters for the alloys had to be found and the model developed originally for pure metals had to be generalized to multilayers. The modifications were verified by computing melting depths and ablation thresholds for pure Al and Ni.Here known data could be reproduced. The improved model was applied to the alloys Al 3 Ni, AlNi and AlNi 3 . While melting depths and ablation thresholds for AlNi behave unspectacular, sharp drops at high fluences are observed for Al 3 Ni and AlNi 3 . In both cases, the reason is a change in ablation mechanism from phase explosion to vaporization. Furthermore, a phase transition occurs in Al 3 Ni. Finally, Al layers of various thicknesses on a Ni substrate have been simulated. Above threshold, 8 nm Al films are ablated as a whole while 24 nm Al films are only partially removed. Below threshold, alloying with a mixture gradient has been observed in the thin layer system.

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Optical Constants of β-Phase NiAl

Cited by 56 publications

References 17 publications

Physical and mechanical properties of the B2 compound NiAl

Physical and mechanical properties of the B2 compound NiAl

Physical and mechanical properties of the B2 compound NiAl

Laser ablation of Al–Ni alloys and multilayers

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