粒子複合合金スラリーにおける粘度のせん断速度依存性

概要

論文の詳細を見る
Viscosity of Al-10%Cu-5%Mg alloy slurries containing alumina particles, were measured to clarify the possibility of die casting of these slurries. The basic rheological data were obtained by a double cylinder type high temperature viscosity meter at 650°C and 590°C. The date were compared with those of matrix alloy without particles. The shear rate used were from 50/s to 300/s. The result are as followings; (1) When the matrix was in liquid state (650°C), viscosities of the slurries were low and not affected by shear rate. (2) The viscosities of slurries containing about 50vol% primary crystals (590°C) without alumina particles was 3.5 Pa·s. The viscosity of the slurry containing 10%alumina particles increased twice. (3) A great thixotoropy was observed in partialy solidified slurries (590°C) both with and without alumina particles. The viscosity ratio of composite slurry at 300/s to that at 50/s was one-sixth. This difference was greater than that of slurry without particles. (4) When the shear rate was increased instanteneously, the viscosity drop of composite slurry was faster than that of slurry without particles. This can be explained by the concentration of alumina particles in the liquid phase and the fragmentation of primary crystal agglomerations by alumina particles. The date indicates that the composite slurries can be used for die castings.
Japan Foundry Engineering Societyの論文