Abstract:The effect of Er on microstructure and mechanical properties of the 5052 aluminum alloy with a big width-to-thickness ratio was investigated by a metallurgical microscope, scanning electron microscope and tensile testing machine. The results showed that the precipitates were slightly refined after Er addition and Al3Fe was transformed into Al6Fe and AlEr with/without a small amount of Fe or Si. The effect of Er on grain refinement was related to its content. When Er content was lower or higher than 0.4%, the g… Show more
“…Al 5052 is annealed at 345 o C, cooling rate and time at temperature are unimportant. 47 Stress relief is generally not required but can be performed at about 220 o C.…”
In this investigation, an attempt has been made to use the waste material in the fabrication of aluminium-based composite material. Waste spent alumina catalyst (SAC) generated from oil refinery industries has been considered as primary reinforcement particle. Waste grinding sludge (GS) produced from iron forging industry was used as secondary reinforcement material in the preparation of composite. Further, chromium (Cr) has been added to SAC and grinding sludge (GS) reinforced aluminium-based composite material to prevent grain growth as well as to control the grain structure of composite material. Experimental results concluded that by adding 4.5% of GS and SAC with 1.5% Cr in aluminium alloy, mechanical properties such as hardness, compressive strength and tensile strength were significantly improved. Hardness compressive strength and tensile strength was increased by 40.06%, 7.24% and 18.86%, respectively, with respect to the aluminium alloy. However, the reduction in toughness was observed. SEM results depicted uniform distribution of SAC and GS particles in Al/4.5% SAC/4.5% GS/1.5% Cr composite. Thermal expansion behaviour and corrosion weight loss of composite have been also investigated to observe the influence of reinforcement in the aluminium alloy.
“…Al 5052 is annealed at 345 o C, cooling rate and time at temperature are unimportant. 47 Stress relief is generally not required but can be performed at about 220 o C.…”
In this investigation, an attempt has been made to use the waste material in the fabrication of aluminium-based composite material. Waste spent alumina catalyst (SAC) generated from oil refinery industries has been considered as primary reinforcement particle. Waste grinding sludge (GS) produced from iron forging industry was used as secondary reinforcement material in the preparation of composite. Further, chromium (Cr) has been added to SAC and grinding sludge (GS) reinforced aluminium-based composite material to prevent grain growth as well as to control the grain structure of composite material. Experimental results concluded that by adding 4.5% of GS and SAC with 1.5% Cr in aluminium alloy, mechanical properties such as hardness, compressive strength and tensile strength were significantly improved. Hardness compressive strength and tensile strength was increased by 40.06%, 7.24% and 18.86%, respectively, with respect to the aluminium alloy. However, the reduction in toughness was observed. SEM results depicted uniform distribution of SAC and GS particles in Al/4.5% SAC/4.5% GS/1.5% Cr composite. Thermal expansion behaviour and corrosion weight loss of composite have been also investigated to observe the influence of reinforcement in the aluminium alloy.
“…[12][13][14][15][16]. A good amount of works regarding the use of these elements in Al-Mg alloys has been reported [17][18][19][20]. It was found that the modifying action of scandium on cast aluminum is non-uniform.…”
Aluminum-magnesium alloys are regularly used to manufacture different types of sheets, automotive trims, and architectural components, which are very intricate in shape. Additionally it is important due to their excellent properties of high-strength to weight ratio, corrosion resistance and weldability. Magnesium increases the strength of the alloys but there is a tendency to form -phase Al 8 Mg 5 compound, usually denoted as Al 3 Mg 2 precipitates along grain boundaries to facilitate intergranular fracture. Numerous studies have been conducted on these alloys to make their use potential as different places. The use of scandium in Al-Mg alloys is meant for taking the advantage of grain refinement along with the unique precipitation strengthening behavior through the formation of Al 3 Sc precipitates with aluminum, a stable LI 2 phase coherent with the matrix. The purpose of this paper is to review and discuss recent developments on Al-6Mg alloy through scandium addition at different levels under thermal treatment.
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