アルミニウム合金の衝撃特性に及ぼす組織的影響因子 : 第二相粒子の分布状態の影響

抄録

There are certain kinds of microstructural characteristics such as second-phase particles, solute atoms, grain size and grain orientation, which affect the impact strength of aluminum alloys. In this paper we discuss the influence of distribution of second-phase particles in various commericial Al-Mg-Si system alloys. Test alloys were prepared with five kinds of heat treatment : T4, under aging, T6, over aging and O temper. The deformation behavior of these alloys was investigated using a compression test at room temperature. Dynamic tests (4×10²∼2×10³s^-1) were performed using a Hopkinson pressure bar system, and static tests (1×10^-3∼1×10^-ls^-1) were performed with an Instron machine for reference. It has been revealed that strain rate sensitivity of flow stress varies with the interaction between second-phase particles and dislocations.