چكيده به لاتين
Powder thixoforging was used to produce amorphous reinforced Al-matrix composites from recycled Al powders obtained from ball-milled cast Al520 end-milled billets. The prior investigations on AAMCs fabrication were focused on processing in solid and liquid state. Nevertheless, there is no investigation on the AAMCs production by semisolid method. Considering the semisolid powder forming advantages, we present another rout of fabricating high-efficient AAMC with high quality and mechanical properties. Tree kind of Al powders were prepared in deferent paticles size and morphology. The unreinforced thixoforged samples reached near full density. Due to the refinement and modification of the microstructure during powder ball milling the mechanical properties improved compared to as cast condition. The hardness of thixoforged monolithic matrix alloys were, respectively, 47, 57, and 61 HRA in defferent samples (for as cast 23 HRA). The compressive yield strength of this samples were, respectively, 126%, 228%, and 336% increased in compared to as cast sample (228 MPa). Tree kind of Ni¬60Nb40 reinforcement with different size, morphology, and thermal stability, were produced. The hardness of composites with 30 vol.% reinforcement content increased 48, 62, and 67HRA for tree type powders using. The compressive yield strength of this samples were, respectively, 143%, 284%, and 472% increased in compared to as cast sample. The tensile yield strength of the best composite reached to 1009MPa. Taking into account of whole AAMCs investigations, this combination of properties is the best untill now.
