Formation of Hypereutectic Aluminium Alloy from Sacrificial Nickel Coating Investigated by Differential Thermal and Microstructural Analysis

Formation of Hypereutectic Aluminium Alloy from Sacrificial Nickel Coating Investigated by Differential Thermal and Microstructural Analysis

abstract

en

Nickel coating was sprayed from the 99,7 wt.% nickel powder by high velocity oxyfuel technique onto the 99.5 wt.% aluminium sheet surface. After the spraying was the samples annealed up to the temperature of 700, 800 and 1000oC. The heating rate of the samples of 5oC / min and cooling rate of 20oC/min was set up. Formation of binary hypereuectic aluminium alloy was investigated by using differential thermal analysis, metalography and scanning compare the results obtained. The microstructure of Al-Ni hypereutectic alloy is of aluminium matrix and Al3Ni eutectic. To estimate the chemical composition of phases the energy dispersive microanalysis was used. With increasing temperature the eutectic coarsen and the particles of primary Al3Ni phase is started to be formed. The image analysis was applied to measure the resulting undissolved nickel coating thickness nad Al3Ni eutectic parameters.

Nickel coating was sprayed from the 99,7 wt.% nickel powder by high velocity oxyfuel technique onto the 99.5 wt.% aluminium sheet surface. After the spraying was the samples annealed up to the temperature of 700, 800 and 1000oC. The heating rate of the samples of 5oC / min and cooling rate of 20oC/min was set up. Formation of binary hypereuectic aluminium alloy was investigated by using differential thermal analysis, metalography and scanning compare the results obtained. The microstructure of Al-Ni hypereutectic alloy is of aluminium matrix and Al3Ni eutectic. To estimate the chemical composition of phases the energy dispersive microanalysis was used. With increasing temperature the eutectic coarsen and the particles of primary Al3Ni phase is started to be formed. The image analysis was applied to measure the resulting undissolved nickel coating thickness nad Al3Ni eutectic parameters.

Nickel coating was sprayed from the 99,7 wt.% nickel powder by high velocity oxyfuel technique onto the 99.5 wt.% aluminium sheet surface. After the spraying was the samples annealed up to the temperature of 700, 800 and 1000oC. The heating rate of the samples of 5oC / min and cooling rate of 20oC/min was set up. Formation of binary hypereuectic aluminium alloy was investigated by using differential thermal analysis, metalography and scanning compare the results obtained. The microstructure of Al-Ni hypereutectic alloy is of aluminium matrix and Al3Ni eutectic. To estimate the chemical composition of phases the energy dispersive microanalysis was used. With increasing temperature the eutectic coarsen and the particles of primary Al3Ni phase is started to be formed. The image analysis was applied to measure the resulting undissolved nickel coating thickness nad Al3Ni eutectic parameters.

Al; Al-Ni hypereutektoidní slitina; DTA; difuze; HVOF

Al; Al-Ni hypereutectic alloy; DTA; diffusion; HVOF

05.09.2011

IInstitute of Technical Sciences of the Serbian Academy of Sciences and Arts

Belgrade, Serbia

YUCOMAT 2011

13

13

13

103–103

1