Variation of microindentation hardness with solidification and microstructure parameters in the Al based alloys

Kaya, Hasan; Çadırlı, Emin; Böyük, Uğur; Maraşlı, Necmetti̇n

doi:10.1016/j.apsusc.2008.08.080

Cited by 65 publications

(51 citation statements)

References 25 publications

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“…Microhardness measurements (all specimens were tested according to ASTM E384) in this work were made with a Future-Tech FM−700 model hardness measuring test device 18 using a 300 g load and a dwell time of 10 seconds giving a typical indentation depth about 30−60 mm. The microhardness values were measured from on the transverse sections of samples.…”

Section: Measurement Of Microhardness and Tensile Strengthmentioning

confidence: 99%

Influences of Growth Velocity and Fe Content on Microstructure, Microhardness and Tensile Properties of Directionally Solidified Al-1.9Mn-xFe Ternary Alloys

et al. 2017

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In this study, influences of growth velocity and composition (Fe content) on the microstructure (rod spacing) and mechanical properties (microhardness, ultimate tensile strength and fracture surface) of Al-Mn-Fe ternary alloys have been investigated. Al-1.9 Mn-xFe (x=0.5, 1.5 and 5 wt. %) were prepared using metals of 99.99% high purity in the vacuum atmosphere. At a constant temperature gradient (6.7 K/mm), these alloys were directionally solidified upwards under various growth velocities (8.3-978 μm/s) using a Bridgman-type directional solidification furnace. The results show that two kinds of Al-rich α-Al phase and Fe-rich intermetallic (Al 6 FeMn) phase may be present in the final microstructures of the alloys when the Fe content increases from 0.5 wt.% to 5 wt.%. Al 6 FeMn intermetallic rod spacing, microhardness and ultimate tensile strength were measured and expressed as functions of growth velocity and Fe content by using a linear regression analysis method. According to experimental results, the microhardness and ultimate tensile strength of the solidified samples increase with increase in the growth velocity and Fe content and decrease in rod spacing. The elongations of the alloys decrease gradually with increasing growth velocity and Fe content.

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Section: Measurement Of Microhardness and Tensile Strengthmentioning

confidence: 99%

Influences of Growth Velocity and Fe Content on Microstructure, Microhardness and Tensile Properties of Directionally Solidified Al-1.9Mn-xFe Ternary Alloys

et al. 2017

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“…As it can be seen by Figure 3, the variation of HV on λ 1 can be represented by power type equations given by HV=204(λ 1 ) -0.15 and HV=3926(λ 1 ) -0.6 for the Al-6wt.%Cu and Al-6wt.%Cu-8wt.%Si alloys, respectively. It is known from the literature that similar equations were also obtained by Çadirli (2013), Kaya et al (2008Kaya et al ( , 2012 and Barros et al (2015) to investigate the influence of primary dendrite arm spacing on microhardness of Al-based binary alloys. Kaya et al (2008) have reported that the It is known that there is no literature HP-type expressions of HV = f (λ 1 ) for Al-Cu-Si alloys.…”

Section: Resultsmentioning

confidence: 64%

“…It is known from the literature that similar equations were also obtained by Çadirli (2013), Kaya et al (2008Kaya et al ( , 2012 and Barros et al (2015) to investigate the influence of primary dendrite arm spacing on microhardness of Al-based binary alloys. Kaya et al (2008) have reported that the It is known that there is no literature HP-type expressions of HV = f (λ 1 ) for Al-Cu-Si alloys. However, it is possible to observe in Table I that the slope value of 3926, obtained for the ternary Al-CuSi alloy studied in this work, is much higher than the values obtained by Kaya et al (2008Kaya et al ( ), Çadirli (2013 and Barros et al (2015) for binary Al-Cu alloys.…”

Section: Resultsmentioning

confidence: 64%

Interconnection between microstructure and microhardness of directionally solidified binary Al-6wt.%Cu and multicomponent Al-6wt.%Cu-8wt.%Si alloys

Vasconcelos

Kikuchi

Barros

et al. 2016

An. Acad. Bras. Ciênc.

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An experimental study has been carried out to evaluate the microstructural and microhardness evolution on the directionally solidifi ed binary Al-Cu and multicomponent Al-Cu-Si alloys and the infl uence of Si alloying. For this purpose specimens of Al-6wt.%Cu and Al-6wt.%Cu-8wt.%Si alloys were prepared and directionally solidifi ed under transient conditions of heat extraction. A water-cooled horizontal directional solidifi cation device was applied. A comprehensive characterization is performed including experimental dendrite tip growth rates (V L ) and cooling rates (T R ) by measuring Vickers microhardness (HV), optical microscopy and scanning electron microscopy with microanalysis performed by energy dispersive spectrometry (SEM-EDS). The results show, for both studied alloys, the increasing of T R and V L reduced the primary dendrite arm spacing (λ 1 ) increasing the microhardness. Furthermore, the incorporation of Si in Al-6wt.%Cu alloy to form the Al-6wt.%Cu-8wt.%Si alloy infl uenced signifi cantly the microstructure and consequently the microhardness but did not affect the primary dendritic growth law. An analysis on the formation of the columnar to equiaxed transition (CET) is also performed and the results show that the occurrence of CET is not sharp, i.e., the CET in both cases occurs in a zone rather than in a parallel plane to the chill wall, where both columnar and equiaxed grains are be able to exist.

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“…As can be seen from Fig.4 and [15][16][17][18] under similar solidification conditions. Tensile strength is an important parameter of engineering materials that are used in structures and mechanical devices.…”

Section: The Effect Of the Growth Rate On The Microhardness And Ultimmentioning

confidence: 54%

Determination of Microstructure, Mechanical, Electrical and Thermal Properties of The Directionally Solidified Al-Si-Co Ternary Alloy

Aker

Kaya

2016

Mat. Res.

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In this work, Al-12.6Si-2Co (wt.%) ternary alloy of near eutectic composition was directionally solidified at a constant temperature gradient (G=7.60 K/mm) in a wide range of growth rates (V=8.35-166.30 µm/s) using by Bridgman type growth apparatus. Flake spacing (λ), microhardness (HV), tensile stress (σ) and electrical resistivity (ρ) were measured from directionally solidified samples. The dependence of flake spacing, microhardness, tensile stress and electrical resistivity on growth rate (V) was also determined by statistical analysis. According to these results, it has been found that for increasing values of V, the values of HV, σ and ρ increase. Variations of electrical resistivity (ρ) for casting Al-Si-Co alloy were also measured at the temperature in range 300−500 K. The enthalpy of fusion (ΔH) for the Al-Si-Co alloy was determined by differential scanning calorimeter (DSC) from heating trace during the transformation from solid to liquid. The results obtained in this work were compared with the previous similar experimental results obtained for binary and ternary alloys.

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Variation of microindentation hardness with solidification and microstructure parameters in the Al based alloys

Cited by 65 publications

References 25 publications

Influences of Growth Velocity and Fe Content on Microstructure, Microhardness and Tensile Properties of Directionally Solidified Al-1.9Mn-xFe Ternary Alloys

Influences of Growth Velocity and Fe Content on Microstructure, Microhardness and Tensile Properties of Directionally Solidified Al-1.9Mn-xFe Ternary Alloys

Interconnection between microstructure and microhardness of directionally solidified binary Al-6wt.%Cu and multicomponent Al-6wt.%Cu-8wt.%Si alloys

Determination of Microstructure, Mechanical, Electrical and Thermal Properties of The Directionally Solidified Al-Si-Co Ternary Alloy

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