Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 688, Issue -, Pages 1-8Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.01.075
Keywords
Aluminum matrix composites; Squeeze casting; Electron microscopy; Coefficient of thermal expansion; X-ray diffraction; Mechanical properties; Castability
Categories
Funding
- Ministry of Education and Science of the Russian Federation [K1-2014-026]
- State Task to the Universities of the Russian Federation [11.1760.2014/K]
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The purpose of this research is to provide a competitive alternative to aluminum silicon alloys used in automotive applications. This alternate was created by developing composites of A1-5%Cu alloy reinforced with B4C particulates with a low coefficient of thermal expansion. Stir casting was used to produce Al-5%Cu alloys containing 2%, 5%, and 7 %wt. B4C particulates were subsequently added using the squeeze casting process. The squeeze casting technique decreased the porosity of the final composites. The composites exhibited a fairly uniform particle distribution throughout the alloy matrix. The microstructure and the XRD results of the composites indicated that a significant reaction had occurred at the interface between the particles and the matrix. Increasing the aging temperature from 200 to 250 degrees C decreased the hardness values of the matrix and the composites and decreased the time required to reach the peak. The coefficient of thermal expansion (GTE) for both the stir and squeezed cast samples decreased as the percentage of reinforcements increased and increased as the temperature range increased. Increasing the concentration of B4C increased YS and decreased the plasticity during compression test at both room and elevated temperatures. The Al-5%Cu-7%B4C composite has a significant higher tensile properties than A336 (AlSil2CuMgNi) at 260 degrees C. Special mould made of 20Cr13 steel was constructed to evaluate castability. The Al-5%Cu-7%B4C composite completely repeats shape of the mould during squeeze casting process without hot cracking.
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