MICROSTRUCTURES AND MECHANICAL PROPERTIES OF Al85Ni12.5Si2.5 ALLOY

Abstract

This study produced Al85Ni12.5Si2.5 alloy by arc melting method. This alloy was annealed at four different temperatures (200 ºC, 300 ºC, 400 ºC, 500 ºC). After annealing alloys analyzes were performed for microstructural, mechanical and thermal behaviour properties of X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential thermal analysis (DTA). The XRD results crystalline phases a-Al, Si, Al3Ni and Al3Ni2 were detected. The SEM investigations showed the formation of a-Al, Si and Al3Ni. The DTA curves the melting point temperature of Al3Ni is to be as 574.8ºC. Mechanical properties of the as-cast and subsequently the micro hardness values of sample annealed at 300 ºC, 400 and 500 ºC were 135.8, 135.2 and 130 HV respectively.