Identification of mechanical properties of CuSil-steel brazed structures joints: a numerical approach

Nafi, Abdelhak; Cheikh, Mohammed; Mercier, Omer

doi:10.1080/01694243.2013.805640

Cited by 6 publications

(8 citation statements)

References 4 publications

(4 reference statements)

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“…Numerical calculations have been conducted for doped crystals to determine the thermodynamic effects and how they depend on the DR and temperature of the crystals. The results of the calculations are in good agreement with experimental values and those of other studies [2][3][4][5][6][7][8][9][10][11]13,16,17].…”

Section: Introductionsupporting

confidence: 88%

“…Figure 3 shows the temperature dependence of the calculated first cumulant, or net thermal expansion (1)  for Cu, Ag, CuAg72 (the alloy with 28% Cu atoms and 72% Ag atoms, referred to as CuSil or UNS P07720 [16]), and CuZn45 (the alloy with 55% Cu atoms and 45% Zn atoms referred to as the brass [17], a yellow alloy of copper and zinc). Figure 4 illustrates the temperature dependence of the calculated second cumulant or DWF ( 2)  , for Cu-Cu, Ag-Ag, Zn-Zn, and their alloys CuAg72 and CuNi45, and comparison with the experimental values [8,12].…”

Section: Fig 3 Temperature Dependence Of the First Cumulantmentioning

confidence: 99%

“…Alloy CuZn45 is often used as heat sinks, ducts and stamping parts because of its high viscosity [17]. Also, CuAg72 is an eutectic alloy, primarily used for vacuum brazing [16]. FIG.…”

Section: Fig 3 Temperature Dependence Of the First Cumulantmentioning

confidence: 99%

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Thermodynamic parameters depend on temperature with the influence of doping ratio of the crystal structure metals in extended X-Ray absorption fine structure

Nguyen

Vũ

Trinh

et al. 2021

SJ TTU

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The effects of the doping ratio and temperature on the cumulants andthermodynamic parameters of crystal structure metals and their alloys wasinvestigated using the anharmonic correlated Einstein model, in extended X-ray absorption fine structure (EXAFS) spectra. We derived analytical expressions for the EXAFS cumulants, correlated Einstein frequency, Einstein temperature, and effective spring constant. We have considered parameters of the effective Morsepotential and the Debye-Waller factor depend on temperature and the effects of the doping ratio of face-centered-cubic (fcc) crystals of copper (Cu-Cu), silver (Ag-Ag), and hexagonal-close-packed (hcp) crystal of zinc (Zn-Zn), and their alloys of Cu-Ag and Cu-Zn. The derived anharmonic effective potential includes the contributions of all the nearest neighbors of the absorbing and scattering atoms. This accounts for three-dimensional interactions and the parameters of theMorse potential, to describe single-pair atomic interactions. The numericalresults of the EXAFS cumulants, thermodynamic parameters, and anharmonic effective potential agree reasonably with experiments and other theories.

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Section: Introductionsupporting

confidence: 88%

Section: Fig 3 Temperature Dependence Of the First Cumulantmentioning

confidence: 99%

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Thermodynamic parameters depend on temperature with the influence of doping ratio of the crystal structure metals in extended X-Ray absorption fine structure

Nguyen

Vũ

Trinh

et al. 2021

SJ TTU

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“…Numerous methods have been developed to investigate how temperature affects the EXAFS cumulants, such as path-integral effective-potential theory (Yokoyama, 1999), the statistical moment method (V. v. Hung et al, 2010), the ratio method (Bunker, 1983), the Debye model (Beni & Platzman, 1976), the Einstein model (Frenkel & Rehr, 1993), and the anharmonic correlated Einstein model (ACEM) (N. v. Hung & Rehr, 1997). Several groups have applied ACEM theory to EXAFS to study how the thermodynamic properties depend on temperature with the effect of the material doping ratio (DR) (Duc et al, 2017;Hung et al, 2015;Kraut & Stern, 2000;Nafi et al, 2013). However, no reports to date have discussed how the thermodynamic parameters and the Debye-Waller factor (DWF) depend on temperature and pressure for Cu, Ag, and their intermetallic alloy CuAg72.…”

Section: Introductionmentioning

confidence: 99%

“…CuAg72 has a ratio of 72% Ag and 28% Cu (±1%) and is also known as CuSil or UNS P0772 (note: CuSil should not be confused with Cusil-ABA, which has the composition 63.0% Ag, 35.25% Cu, and 1.75% Ti). It is an eutectic alloy and is used primarily for vacuum brazing (Nafi et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Investigation of temperature and pressure effects on thermodynamic parameters of intermetallic alloy in EXAFS

Duc

2020

Cogent Engineering

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This work advances the anharmonic correlated Einstein model to investigate how pressure and temperature affect the Debye-Waller factor and thermodynamic parameters of an intermetallic alloy. By using the anharmonic correlated Einstein model in extended X-ray absorption fine structure (EXAFS) theory, analytical expressions are derived for the effective spring constant, EXAFS cumulants, the anharmonic factor, and the thermal expansion coefficient at high temperature and pressure. The results show that both the anharmonicity of the thermal atomic vibration and the effects of pressure are essential for the thermodynamic parameters and the EXAFS Debye-Waller factor, as well as showing that the anharmonic contributions are important in the EXAFS spectrum. Numerical calculations of these thermodynamic quantities are performed for pure Cu and Ag and for CuAg72 alloy, and the results are consistent with those obtained experimentally and from other theories.

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Role of grain size and crystallographic texture on tensile behavior induced by sliding mechanism in Ti-6Al-4V alloy

Benmessaoud

Cheikh

Velay

et al. 2020

Materials Science and Engineering: A

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The aim of this paper is to investigate the coupled effects of grain size and crystallographic texture on the mechanical behavior induced by gliding mechanism in Ti-6Al-4V alloy. Thus, four microstructures of Ti-6Al-4V alloy whose grain size and crystallographic texture are different were examined by tensile tests along the rolling direction at room temperature. In this study, the contribution of gliding on basal ⟨ ⟩, prismatic ⟨ ⟩ and pyramidal ⟨ + ⟩ plans in the accommodation of plastic strain was estimated by means of a slip trace analysis. The role of the individual grain size and the crystallographic texture was then statistically evaluated. Based on the results of slip trace analysis, numerical optimizations of the Critical Resolved Shear Stress (CRSS) of basal ⟨ ⟩, prismatic ⟨ ⟩ and pyramidal ⟨ + ⟩ in the four microstructures were then carried out, using transition scale rules and a local behavior model. The results suggest that the mechanical behavior of Ti-6Al-4V is controlled by the activation of slip systems that depend not only on their CRSS but also the initial orientation and size of each individual grain. The low CRSS of prismatic ⟨ ⟩ slip systems can lead to early activation of these systems in favorably oriented coarse grains. Therefore, a local plastic deformation can be shown. At high levels of loading, increasing the grain size can minimize the crystallographic texture effects by deforming the unfavorably oriented coarse grains. Moreover, based on the results of the numerical optimization, it can be also suggested that the CRSS can decrease with the increase in grain size according to the local Hall-Petch relationship.

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Identification of mechanical properties of CuSil-steel brazed structures joints: a numerical approach

Cited by 6 publications

References 4 publications

Thermodynamic parameters depend on temperature with the influence of doping ratio of the crystal structure metals in extended X-Ray absorption fine structure

Thermodynamic parameters depend on temperature with the influence of doping ratio of the crystal structure metals in extended X-Ray absorption fine structure

Investigation of temperature and pressure effects on thermodynamic parameters of intermetallic alloy in EXAFS

Role of grain size and crystallographic texture on tensile behavior induced by sliding mechanism in Ti-6Al-4V alloy

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