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This study deals with the effect of different quantities of aluminum (Al) on the wear resistance and machinability in AM series cast magnesium alloys. Changes in the quantity of Al in these alloys (containing 0.5 wt.-% Mn) and their effect on hardness, wear resistance and machinability with respect to cutting force were analyzed. To this purpose, AM series cast magnesium alloys (AM20, AM40, AM60, and AM90) in varying amounts of Al from 2 to 9 wt.-% were used. It was observed that the intermetallic phases Mg17Al12 and Al8Mn5 found in the microstructure had an effect on their wear resistance, hardness and machinability (with respect to cutting force), flank build-up, chip formation and surface roughness. AM90 alloy manifested the highest values in terms of hardness, wear resistance and surface quality among these alloys. On the other hand, AM90 alloy had the lowest machinability properties.

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Nickel based superalloys offer high strength, corrosion resistance, thermal stability and superb thermal fatigue properties. However, they have been one of the most difficult materials to machine due to these properties. Although we are witnessing improved machining strategies with the developing machining, tooling and inspection technologies, machining of nickel based superalloys is still a challenging task due to in-process strains and post process part quality demands. Selecting optimum machining parameters for quality, productivity and profitability is of paramount importance. Many studies have been conducted on various aspects of machinability of nickel based superalloys including defining the optimum cutting parameters, to develop a better understanding of machining them. The recent studies suggest new findings, and discuss previously reported results, related to the concerns of superalloy machining. This review presents the influences of the most significant cutting parameters on various machinability characteristics with respect to the recent studies as well as the previous ones. The reviewed machinability characteristics may be listed as: tool wear, cutting forces and surface integrity.

This study investigates the effect of the amount of Al amount in AS series magnesium alloys on wear resistance and machinability. Changes in mechanical properties, wear resistance, and machinability were studied depending on the Al amount in magnesium alloys containing 1% Si. Therefore, AS series magnesium alloys (AS11, AS21, AS41, AS61, and AS91) (containing Al in various degrees ranging from 1% to 9%) were used in this study. It was observed that the hardness of intermetallic phases in the microstructure of AS series magnesium alloys affected wear resistance and machinability depending on the increase in Al amount. Mg2Si intermetallic phase in the microstructure of AS91 alloy was established to reduce machinability while increasing hardness and wear resistance.

This study investigates the effects of Al (aluminium) amount in AM series magnesium alloys on mechanical properties and machinability (cutting forces). Changes in microstructure and mechanical properties and their effects on cutting forces were analysed depending on the increase in Al amount. For this reason, AM series magnesium alloys (AM20, AM40, AM60, and AM90) with varying amounts of Al % (from 2 to 9 %) were used in the study. It was observed that in AM series magnesium alloys (containing 0.5 % Mn), intermetallic phases found in microstructure (Mg17Al12 and Al8Mn5) improved the mechanical properties and lowered machinability by rising the cutting forces (Fc) depending on the increase in Al amount. Also, the surface roughness (Ra) of intermetallic phases was observed to have an impact on flank build-up-FBU and chip formation. While AM90 had the highest values in terms of mechanical properties and surface quality, AM20 had the lowest values. On the other hand, AM20 had the highest El% values and machinability properties.

This study investigated the effect of aluminum (Al%) amount found in AZ series magnesium alloys on hardness, wear resistance, and machinability. The amount of zinc (1 % Zn) used in the experiment was kept fixed, and changes on hardness, wear resistance, and machinability were analyzed depending on the increase in the amount of Al%. To this end, AZ series magnesium alloys (AZ01, AZ21, AZ41, AZ61 and AZ91) (that include aluminum at rates ranging from 0 up to 9 %) were used in the study. It was observed in AZ series magnesium alloys that intermetallic phase in microstructure (β-Mg17Al12) affected hardness, wear resistance, and machinability of the alloy depending on the increase in Al amount. It was established that Mg17Al12 intermetallic phase in the microstructure of AZ91 alloy increased the machinability of the alloy.