Abstract
In the present effort, Al-AlxW composites have been prepared by vacuum arc melting (VAM), conventional casting (CAST) and free sintering (PM) with the objective to determine an effective fabrication route in terms of low cost, ease of manufacture and property boosting. The produced Aluminium Matrix Composites (AMCs) contain several types of in-situ aluminides. Their morphology, stoichiometry and distribution strongly depend on the fabrication route. The particulate aluminide reinforcements have a beneficial effect on the wear response of the monolithic matrix. VAM-AMCs show the highest resistance to wear. A wear mechanism is proposed.
Highlights
Reinforcement of aluminium with particles of Al-based intermetallic compounds (IMCps) has led to notably improved properties of Al, such as mechanical properties [1,2,3,4,5], corrosion and wear resistance [6,7,8,9,10,11]
Particulate IMC reinforcement of Al can be attained by ex-situ introduction of the IMCps into the Al-matrix or by in-situ processing of the Almatrix with the IMC constituent elements
Laser surface alloying of Al with W, resulting in the formation of Al4W, W and Al led to a substantial enhancement of the corrosion resistance [14]
Summary
Reinforcement of aluminium with particles of Al-based intermetallic compounds (IMCps) has led to notably improved properties of Al, such as mechanical properties [1,2,3,4,5], corrosion and wear resistance [6,7,8,9,10,11]. In-situ processing can be realized by various methods, like liquid metal infiltration, powder metallurgy, various casting techniques and mechanical alloying [5]. The majority of the investigations on the alloy design and properties concern the aluminides of Ni, Fe and Ti. Research on the aluminides of refractory metals (RM) is quite limited possibly due to the high costs and the low workability of the RMs. an RM, such as W, has excellent properties. The above findings provide a strong motive to investigate the ability to prepare Al reinforced by tungsten aluminides by simple and relatively low-cost methods
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