Structural and mechanical characterization of rapidly solidified Al95Ni5 and Al93Ni5Mm2 alloys prepared by centrifugal atomization

Vojtěch, Dalibor; Průša, Filip; Michalcová, Alena

doi:10.1016/j.jallcom.2010.07.081

Cited by 8 publications

(6 citation statements)

References 22 publications

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“…It is well-established that automotive parts such as connecting rod, cylinder sleeve, piston and valve retainer as well as compressor parts such as the rotary compressor vane and shoe disc may be manufactured with Al-Ni alloys 9 . A Vickers microhardness value of about 150 HV was obtained by Vojtech et al 7 during the evaluation performed in a rapidly solidified Al 95 Ni 5 (at%) by centrifugal atomization. The DSC records obtained for a granulometric fraction smaller than 250 µm showed no evidences of exothermal effects at low temperatures of about 150-300 °C which would correspond to the crystallization of an amorphous phase.…”

Section: Introductionmentioning

confidence: 94%

“…In addition, the association of a refined structure and a considerable fraction of Al-Ni intermetallics may result in high hardness and, as a consequence, high mechanical strength. It is expected that a bulk Al-Ni alloy may exceed the strength of many commercial materials 7 . Although the ultimate tensile stress of commercially available Al-based 'high-strength' alloys (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Although the ultimate tensile stress of commercially available Al-based 'high-strength' alloys (e.g. Al-Cu-Mg, Al-Zn-Mg-Cu and Al-Si-Mg) approaches 700 MPa, their 'high-strength state' remains only at low temperatures (<200 °C) 7 . In contrast, the hard Al 3 Ni particles are not only able to induce a high mechanical strength in Al-Ni alloys but are also considered to be thermally stable up to ~500 °C 8 .…”

Section: Introductionmentioning

confidence: 99%

“…The absence or presence of amorphous phase in RS Al-Ni based alloys can be explained in terms of their chemical composition 7 . It is generally agreed that the formation of a glassy phase would require higher nickel content.…”

Section: Introductionmentioning

confidence: 99%

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Rapid solidification of an Al-5Ni alloy processed by spray forming

et al. 2012

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Recently, intermetallic compounds have attracted much attention due to their potential technological applications as high-temperature materials. In particular the intermetallic compounds, associated with the Al-Ni binary system stand out as promising candidates for high-temperature materials for the use in harsh environments. It is expected that a bulk Al-Ni alloy may exceed the strength of many commercial materials. The great challenge in developing these alloys is to manipulate the solidification thermal parameters in order to obtain the desired microstructural features. One of the indicated routes to obtain very refined intermetallic phases dispersed in the microstructure is the spray forming process. The dendritic and eutectic growth dependences on cooling rate are already known for directionally solidified (DS) hypoeutectic Al-Ni alloys. In the case of rapidly solidified (RS) samples, extrapolations of such experimental laws are needed, which can be very helpful to estimate realistic values of high cooling rates imposed during the spray forming process. The present study aims to compare directionally solidified and spray-formed Al-5 wt. (%)Ni alloy samples with a view to providing a basis for understanding how to control solidification parameters and the as-cast microstructure. The Al-5.0 wt. (%)Ni alloy was shown to have a cellular morphology for the overspray powder size range examined (up to 500 µm). The mean cell spacing decreased from 5.0 to 1.1 µm with the decrease in the powder average diameter. It was found that the experimental cooling rates imposed during the atomization step of the overspray powder solidification varied from 10 3 to 2.10 4 K/s. The DSC trace depicted a crystallization peak of an amorphous structure fraction in the smallest Al-5.0 wt. (%)Ni alloy powder size range (<32 µm) estimating a 15 µm critical diameter of amorphous powder in the binary Al 97.5 Ni 2.5 (at%) alloy.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rapid solidification of an Al-5Ni alloy processed by spray forming

et al. 2012

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“…3(d)-(f). The formation of Al 3 Ni phase can be analyzed by the pseudoternary Al-Si-Ni diagram, considering that the amount of Ce is less than 1% and the concentration of Ce in Al 3 Ni is negligible [30,31]. Fig.…”

Section: Microstructure Of As-atomized Powdersmentioning

confidence: 99%