アルミニウム合金の衝撃特性に及ぼす組織的影響因子 : 溶質原子の影響

抄録

Certain microstructural characteristics, such as second-phase particles, solute atoms, gain size and grain orientation, affect the impact strength of aluminum alloys. In this paper, we discuss the influence of solute magnesium atoms on impact strength and ductility. In order to investigate the influence of solute magnesium atoms, five kinds of binary Al-Mg alloys with 2∼8 wt.% magnesium concentration and high-purity aluminum were used. Dynamic tensile tests (1.5×10³s^-1) were performed using a Hopkinson pressure bar system, and static tests (1×10^-4, 2×10^-3s^-1) were performed with an Instron machine for reference. The values of flow stress at certain strain can be described as a linear function of magnesium concentration beyond 2.7 wt.%. Total elongation increases with increasing strain rate and decreases with increasing magnesium concentration.