Effect of reinforcement particle size on microstructure and mechanical properties of AlZnMgCu/AlN nano-composites produced usingmechanical alloying
PBN-AR
Instytucja
Instytut Metalurgii i Inżynierii Materiałowej im. Aleksandra Krupkowskiego Polskiej Akademii Nauk
Źródłowe zdarzenia ewaluacyjne
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN
0925-8388
EISSN
Wydawca
ELSEVIER SCIENCE SA
DOI
Rok publikacji
2014
Numer zeszytu
Strony od-do
423-427
Numer tomu
586
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EN
Metal matrix composites; Aluminum alloy matrix; 7475/AlN; Powder metallurgy
Streszczenia
Język
In this study, an attempt has been made to determine the effect of an AlN reinforcement size on properties of aluminum alloy matrix composites produced via mechanical alloying/uniaxial hot pressing. Composite samples were prepared using pre-alloyed AA7475 powder with 10 wt.% of AlN additions of differing average particle sizes: <40 μm, ∼1 μm or <1 μm. Powders were milled in a high energy ball mill for up to 40 h and then hot pressed in vacuum at 380 °C/600 MPa. Milled powder analysis revealed that addition of micro-sized hard reinforcing phase allows to achieve a higher level of crystallite size refinement as compared with submicron reinforcement, under the same milling conditions. The SEM/TEM microstructures of compacted samples confirmed uniform dispersion of the ceramic phases independent of the size. All of the composites were characterized by fine matrix grain size (<200 nm) and a high density of even finer intermetallic, Zn, Cu, Mg or Fe rich precipitates. The obtained hardness results were highest for ∼1 μm AlN addition – near 320 HV which is an 30% improvement over the matrix itself. The best properties of composites reinforced with intermediate particles suggest that the achievement of a compromise between the structure refinement during MA and grain growth restraint during hot pressing is of a particular importance in composite materials produced in this way.
Treść
In this study, an attempt has been made to determine the effect of an AlN reinforcement size on properties of aluminum alloy matrix composites produced via mechanical alloying/uniaxial hot pressing. Composite samples were prepared using pre-alloyed AA7475 powder with 10 wt.% of AlN additions of differing average particle sizes: <40 μm, ∼1 μm or <1 μm. Powders were milled in a high energy ball mill for up to 40 h and then hot pressed in vacuum at 380 °C/600 MPa. Milled powder analysis revealed that addition of micro-sized hard reinforcing phase allows to achieve a higher level of crystallite size refinement as compared with submicron reinforcement, under the same milling conditions. The SEM/TEM microstructures of compacted samples confirmed uniform dispersion of the ceramic phases independent of the size. All of the composites were characterized by fine matrix grain size (<200 nm) and a high density of even finer intermetallic, Zn, Cu, Mg or Fe rich precipitates. The obtained hardness results were highest for ∼1 μm AlN addition – near 320 HV which is an 30% improvement over the matrix itself. The best properties of composites reinforced with intermediate particles suggest that the achievement of a compromise between the structure refinement during MA and grain growth restraint during hot pressing is of a particular importance in composite materials produced in this way.
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ORIGINAL_ARTICLE
Inne
System-identifier
667571
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