Structural investigations of mechanical properties of Al based rapidly solidified alloys

Karaköse, Ercan; Keskín, Mustafa

doi:10.1016/j.matdes.2011.05.042

Cited by 53 publications

(25 citation statements)

References 33 publications

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“…Table 3 presents the consolidated results of HV = f (V L , T R ,  1 and  1 -1/2 ) for both alloys compared with others results from the literature developed for the Al-3 wt% Cu alloy solidified under steady-state conditions of heat extraction. Figure 11 compares the power-type experimental law obtained for the Al-3 wt% Cu alloy of the present study with the experimental laws proposed by Çadırlı [1] and Karaköse and Keskin [22]. A reasonable approximation of the compared laws to high and low cooling rates was observed.…”

Section: Resultssupporting

confidence: 69%

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Measurements of microhardness during transient horizontal directional solidification of Al-Rich Al-Cu alloys: Effect of thermal parameters, primary dendrite arm spacing and Al2Cu intermetallic phase

et al. 2015

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In this work, the effect of the growth rate (V L ) and cooling rate (T R ), primary dendritic arm spacing ( 1 ) and Al 2 Cu intermetallic phase on the microhardness was investigated during transient horizontal directional solidification of Al-3wt%Cu and Al-8wt%Cu alloys. Microstructural characterization of the investigated alloys was performed using traditional techniques of metallography, optical and SEM microscopy and X-Ray diffraction. The microhardness evolution as a function of the thermal and microstructural parameters (V L , T R , and  1 ) was evaluated using power and Hall-Petch type experimental laws, which were compared with other laws in the literature. In order to examine the effect of the Al 2 Cu intermetallic phase, microhardness measurements were performed in interdendritic regions. Finally, a comparative analysis was performed between the experimental data of this work and theoretical models from the literature that have been proposed to predict primary dendrite arm spacing, which have been tested in numerous works considering upward directional solidification.

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Section: Resultssupporting

confidence: 69%

“…A reasonable approximation of the compared laws to high and low cooling rates was observed. It is emphasized that the cooling rates applied in these studies were between 0.01 and 4 K/s and 1.7×10 6 to 3.7×10 7 K/s for the works presented by Çadırlı [1] and Karaköse and Keskin [22], respectively.…”

Section: Resultsmentioning

confidence: 99%

Measurements of microhardness during transient horizontal directional solidification of Al-Rich Al-Cu alloys: Effect of thermal parameters, primary dendrite arm spacing and Al2Cu intermetallic phase

et al. 2015

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“…During the last few decades, rapidly solidified (RS) Al-alloys have been attracting significant attention due to improved properties (such as mechanical behavior and corrosion resistance) in relation to conventional Al alloys [1][2][3][4][5][6][7][8][9][10]. Rapid solidification processes (RSP) can produce many metastable phases, such as supersaturated solid solutions, intermediate phases and metallic glasses.…”

Section: Introductionmentioning

confidence: 99%

“…Rapid solidification processes (RSP) can produce many metastable phases, such as supersaturated solid solutions, intermediate phases and metallic glasses. Karakose et al [2] investigated the microstructure and the mechanical behavior of RS Al-3 wt.% Fe, Al-3 wt.% Cu and Al-3 wt.% Ni alloys: The RS alloys presented more uniform and fine microstructures with minor dendritic or polygonal structures in comparison with their conventional counterparts, while most of the alloying elements remained dissolved in the Al matrix; the undissolved elements formed intermetallic phases (Al 3 Fe, Al 2 Cu, Al 3 Ni). Gogebakan et al [4] prepared an Al-6.5 wt.% Ni alloy by melt spinning (MS) and casting: RS led to significant hardening attributed to solid solution and grain refinement strengthening.…”

Section: Introductionmentioning

confidence: 99%

Al-Co Alloys Prepared by Vacuum Arc Melting: Correlating Microstructure Evolution and Aqueous Corrosion Behavior with Co Content

Lekatou

Sfikas

Petsa

et al. 2016

Metals

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Hypereutectic Al-Co alloys of various Co contents (7-20 weight % (wt.%) Co) were prepared by vacuum arc melting, aiming at investigating the influence of the cobalt content on the microstructure and corrosion behavior. Quite uniform and directional microstructures were attained. The obtained microstructures depended on the Co content, ranging from fully eutectic growth (7 wt.% and 10 wt.% Co) to coarse primary Al 9 Co 2 predominance (20 wt.% Co). Co dissolution in Al far exceeded the negligible equilibrium solubility of Co in Al; however, it was hardly uniform. By increasing the cobalt content, the fraction and coarseness of Al 9 Co 2 , the content of Co dissolved in the Al matrix, and the hardness and porosity of the alloy increased. All alloys exhibited similar corrosion behavior in 3.5 wt.% NaCl with high resistance to localized corrosion. Al-7 wt.% Co showed slightly superior corrosion resistance than the other compositions in terms of relatively low corrosion rate, relatively low passivation current density and scarcity of stress corrosion cracking indications. All Al-Co compositions demonstrated substantially higher resistance to localized corrosion than commercially pure Al produced by casting, cold rolling and arc melting. A corrosion mechanism was formulated. Surface films were identified.

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“…It should be emphasized that smaller primary dendritic spacing were obtained for higher growth rate and cooling rate, as can be seen in Figures 6 and 7, thus affecting the HV values. In Figure 11 the experimental law proposed by ÇADIRLI [22] and results obtained by KARAKÖSE and KESKIN [20] are presented, in these works the cooling rates applied were between 0.01 and 4 K/s and 1.7×10 6 to 3. …”

Section: Resultsmentioning

confidence: 95%

Influence of upward and horizontal growth direction on microstructure and microhardness of an unsteady-state directionally solidified Al-Cu-Si alloy

et al. 2016

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In order to analyze the effect of the growth direction on dendrite arm spacing (1) and microhardness (HV) during horizontal directional solidification (HDS), experiments were carried out with the Al-3wt.%Cu-5.5wt.%Si alloy and the results compared with others from the literature elaborated for upward directional solidification (UDS). For this purpose, a water-cooled directional solidification experimental device was developed, and the alloy investigated was solidified under unsteady-state heat flow conditions. Thermal parameters such as growth rate (VL) and cooling rate (TR) were determined experimentally and correlations among VL, TR, 1 and HV has been performed. It is observed that experimental power laws characterize 1 with a function of VL and TR given by: 1=constant(VL) -1.1 and 1=constant(TR) -0.55 . The horizontal solidification direction has not affected the power growth law of 1 found for the upward solidification. However, higher values of 1 have been observed when the solidification is developed in the horizontal direction. The interrelation of HV as function of VL, TR and 1 has been represented by power and Hall-Petch laws. A comparison with the Al-3wt.%Cu alloy from literature was also performed and the results show the Si element affecting significativaly the HV values.

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Structural investigations of mechanical properties of Al based rapidly solidified alloys

Cited by 53 publications

References 33 publications

Measurements of microhardness during transient horizontal directional solidification of Al-Rich Al-Cu alloys: Effect of thermal parameters, primary dendrite arm spacing and Al2Cu intermetallic phase

Measurements of microhardness during transient horizontal directional solidification of Al-Rich Al-Cu alloys: Effect of thermal parameters, primary dendrite arm spacing and Al2Cu intermetallic phase

Al-Co Alloys Prepared by Vacuum Arc Melting: Correlating Microstructure Evolution and Aqueous Corrosion Behavior with Co Content

Influence of upward and horizontal growth direction on microstructure and microhardness of an unsteady-state directionally solidified Al-Cu-Si alloy

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