金属間化合物粒子強化アルミニウム合金ダイカストの破壊靱性

概要

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The fracture toughness, K_<max>, which dose not satisfy the requirement for the plane-strain, of aluminum alloy die castings reinforced with NiAl and Ni_3Al, intermetallic compound, and SiC particles has been studied by 3 point bending tests in the temperature range from 20℃ to 300℃. The K_<max>'s were almost comparable in the materials investigated ; the highest in unreinforced alloy, and then SiC-, Ni_3Al- and NiAl-particulate reinforced one in the order. These appear to be attributed to the microscopic characteristics observed in the fracture surfaces and longitudinal cross-sections : (1) debond at matrix/particle interface and fracture of particles, (2) size and aspect ratio of particles, and (3) precipitates in the matrix. The K_<max> decreased with an increase in particulate volume fraction because of decrease in the amount of plastic deformation in the matrix and damages associated with particles. The K_<max>'s in the reinforced alloys at 20℃ were comparable to those at 200℃. The temperature dependencies of K_<max> appeared to be associated with those of 0.2% proof stress.
一般社団法人日本機械学会の論文
1998-08-25