Analysis of microhardness data in TlxIn1−xSe

Yanchev, Ivan; Trifonova, E. P.; Karakotsou, Ch.; Anagnostopoulos, A. N.; Bleris, G. L.

doi:10.1007/bf00356689

Cited by 12 publications

(2 citation statements)

References 8 publications

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“…22 The probability distribution function (PDF) of the Vickers hardness was reported in the literature to correspond to the Gaussian (or normal) distribution 23 and log-normal distribution. 24 A. M. Hassan et al 25 studied the significance of the process parameters of friction-stir welding of aluminium-matrix composites to set the optimum level for each of these parameters and to further predict which responses are affected when using analyses of variance (ANOVA). 25 The present study used the Matlab 2014a statistical toolbox to analyse the probability density function (PDF) of the obtained microhardness results.…”

Section: Resultsmentioning

confidence: 99%

Microstructure evolution and statistical analysis of Al/Cu friction-stir spot welds

Mubiayi¹,

Akinlabi²,

Makhatha³

2017

Mater. Tehnol.

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In this paper, friction-stir spot welding (FSSW) is performed on 3 mm thick AA1060 and C11000 using different process parameters and tool geometries. The microstructure-and the microhardness-profile analyses were conducted and the probability distribution function (PDF) of the obtained microhardness values was determined. Optical images showed a good material mixing in most of the spot welds produced, whereas the energy-dispersive-spectroscopy (EDS) analysis showed the presence of intermetallic compounds. Microhardness results revealed that process parameters and tool geometries have significant effects on the distribution of microhardness values in different locations of the produced spot welds. Furthermore, goodness-of-fit values showed that most of the R 2 values ranged between 0.8842 and 0.9999, which indicated how well the model fits with the experimental data. On the other hand, the residuals comprised positive and negative runs which also indicated the existence of a certain correlation with the experimentation. Keywords: aluminium, copper, friction-stir spot welding, statistical analysis V prispevku je predstavljeno vrtilno-torno to~kovno varjenje (angl. FSSW) na 3 mm debeli plo~evini AA1060 in C11000 z uporabo razli~nih procesnih parametrov in razli~no geometrijo orodij. Izvedene so bile analize profila mikrostrukture in mikrotrdote in dolo~ena je bila porazdelitvena funkcija verjetnosti za dobljene vrednosti mikrotrdote. Posnetki so pokazali dobro me{anje materiala na ve~ini izdelanih to~kovnih zvarov, medtem ko je EDS-analiza pokazala prisotnost intermetalnih spojin. Meritve mikrotrdote so pokazale, da imajo procesni parametri in geometrija orodij pomemben vpliv na porazdelitev mikrotrdote glede na razli~ne lokacije izdelanih to~kovnih zvarov. Nadalje je serija opazovanj oz. ocena pokazala, da je ve~ina R2 vrednosti rangiranih med 0,8842 in 0,9999. To potrjuje, da se model dobro ujema z eksperimentalnimi podatki. Po drugi strani pa razlika med pozitivnimi in negativnimi cikli ka`e na obstoj dolo~ene korelacije s preizku{anjem.

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Section: Resultsmentioning

confidence: 99%

Microstructure evolution and statistical analysis of Al/Cu friction-stir spot welds

Mubiayi¹,

Akinlabi²,

Makhatha³

2017

Mater. Tehnol.

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“…4(a) and 4(b) the variation of the lattice constants a and c is shown as full circles, while the square indicates the TlSe values from Wyckoff (1965). The solid lines represent the best ®ts obtained using the equation Further, the energy gap, the conductivity, the band discontinuity and the microhardness of the Tl 2x In 2(1Àx) Se 2 compounds studied were found to vary with the stoichiometry x according to Kurnakov's law also (Yanchev et al, 1995;Hatzisymeon et al, 1996).…”

Section: Crystal Structurementioning

confidence: 97%

X-ray Diffraction Study of the Crystal Structure of the Tl Ternary Chalcogenides Tl_2xIn_2(1−x)Se₂, x = 0.2, 0.3,...0.9

Hatzisymeon¹,

Kokkou²,

Anagnostopoulos³

et al. 1998

Acta Crystallogr Sect B

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A series of thallium ternary chalcogenides with the composition Tl 2x In 2(1Àx) Se 2 , x = 0.2, 0.3,...0.9, have been studied by X-ray powder and, for some of them, singlecrystal diffraction. They are tetragonal, space group I4/mcm, Z = 4, and isostructural with the binary semiconductor TlSe. Their crystal structures have been solved by direct methods and re®ned by the Rietveld method to a precision which is satisfactorily comparable to single-crystal results. As x is changed from x = 0.2 to x = 0.9 the unit-cell parameters and volume decrease or increase following Kurnakov's law, which is valid for solid solutions.

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Microhardness Profile and Shear Tensile Test of FSSWelds AA1060 to C11000 (Case Study)

Mubiayi

Akinlabi

Makhatha

2018

Structural Integrity

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Analysis of microhardness data in TlxIn1−xSe

Cited by 12 publications

References 8 publications

Microstructure evolution and statistical analysis of Al/Cu friction-stir spot welds

Microstructure evolution and statistical analysis of Al/Cu friction-stir spot welds

X-ray Diffraction Study of the Crystal Structure of the Tl Ternary Chalcogenides Tl_2xIn_2(1−x)Se₂, x = 0.2, 0.3,...0.9

Microhardness Profile and Shear Tensile Test of FSSWelds AA1060 to C11000 (Case Study)

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Analysis of microhardness data in TlxIn1−xSe

Cited by 12 publications

References 8 publications

Microstructure evolution and statistical analysis of Al/Cu friction-stir spot welds

Microstructure evolution and statistical analysis of Al/Cu friction-stir spot welds

X-ray Diffraction Study of the Crystal Structure of the Tl Ternary Chalcogenides Tl2x In2(1−x)Se2, x = 0.2, 0.3,...0.9

Microhardness Profile and Shear Tensile Test of FSSWelds AA1060 to C11000 (Case Study)

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X-ray Diffraction Study of the Crystal Structure of the Tl Ternary Chalcogenides Tl_2xIn_2(1−x)Se₂, x = 0.2, 0.3,...0.9