Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 619, Issue -, Pages 190-198Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.09.090
Keywords
A206 alloys; Semi solid processing; X-ray diffraction; Fracture
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In this study, semi-solid stir casting and ball milling processes are combined into an integrated composite fabrication process. Two different architectures were utilized to incorporate reinforcing particle into semi-solid alloy i.e., (i) ball milling of K2TiF6 and aluminum powder for 5 h and subsequently with nano-alumina particles (Al2O3np) for 1 h and (ii) ball milling of K2TiF6, Al2O3np and aluminum powder for 2 h. Accordingly, the milled powders were incorporated into molten AlA206 alloy using a non-contact ultrasonic vibration method. The effect of milling procedure on microstructural evolution and tensile properties were then explored. Two different microstructures were characterized including well-distributed Al2O3np and Al3Ti particles (A13Tip) and a network-structure containing Al(3)Tip+Al2O3np. This unique architecture of network-structure brought about increment in tensile properties compared to well-distributed reinforcement particles, ascribed to the strewing of Al(3)Tip+Al2O3np around matrix grain boundaries, act as a three-dimension skeletal structure with high local volume fraction of Al(3)Tip-Al2O3np. (C) 2014 Elsevier B.V. All rights reserved.
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