Comparison of creep strength and models of solution-strengthened alloys in aluminum-magnesium binary system at around 0.6Tm

摘要

Creep strength of solution-hardened alloys in aluminum-magnesium system are compared and change of its creep characteristics are discussed based on viscous glide concepts. Normalized creep rates in the system are summarized and advantages of magnesium-based alloys as light heat resistant materials are pronounced. Change of creep behavior attributed to the breakaway of dislocation from solute atmosphere is discussed based on experimental results and numerical calculations. Huge differences in the normalized creep rates are attributed to mean internal stresses, and importance of quantitative evaluation of effective and internal stress is shown. Importance of considerations of creep mechanism and of its change are also pronounced.