Superplastic Behavior of Hyper-Eutectic Al-Si P/M Alloys Produced by Centrifugal Atomization Process.

富雄, 佐藤; 邦郎, 沖本; 新一, 西田; 賢司, 松木

doi:10.2472/jsms.44.608

Cited by 3 publications

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“…The rapid solidification process allows for microstructure control such as grain refining. The centrifugal atomization process is available to produce rapidly solidified powders with more homogenous and refined microstructures and more extensive solid solubility than conventional air-and gasatomized powders [2]. The centrifugally atomized powders also feature low surface oxidation and are satellitefree.…”

Section: Introductionmentioning

confidence: 99%

“…The centrifugal atomization process [4] is illustrated in In this method, molten metals ejected onto a highangular-velocity disk axe atomized centrifugally and the atomized fine droplets are solidified rapidly by a cooling gas. The cooling rate of the powders obtained has been estimated to be of the order of 105-104 K/s for a particle size of less than 100 [trn [2]. A melt spinner with copper wheel was operated in an argon gas atmosphere at a rollperipheral speed of 50 m/s.…”

Section: Introductionmentioning

confidence: 99%

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Superplastic-like behavior of Al-high Si alloys produced from rapidly solidified powders and ribbons

Satoh¹,

Okimoto

Nishida

et al. 1999

Metals and Materials

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The high temperature tensile properties of hyper-eutectic A1-Si alloys were studied at temperatures between 683 and 813 K at initial strain rates between 8.3X10 "4 and 4.2• 1 s ~ . The alloys were prepared from prealloyed powders and ribbons, which were respectively fabricated by the centrifugal atomization and melt spinning, through the hot extrusion process at an extrusion ratio of 110:1. The extruded alloy bars prepared from the powders and ribbons, i.e. the powder-extruded and ribbon-extruded bars, have homogenous microstructures with the fine silicon particles dispersed in the aluminum matrices for the A1-25Si and AI-15Si alloys. The maximum elongation-to-failure of the powder-extruded bar and the ribbon-bar are almost equal, 150%, for the A1-25Si alloy. In the AI-15Si alloy, the ribbon-extruded bar has superior elongation compared to the powder-extruded bar, that is, these are respectively 520% and 400%. The maximum elongation was attained at the relatively high strain rate of 10 -5 s-' independent of the silicon content and solidification process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%