Anelastic relaxation at sub-resonance frequency (from 0.01 to 100 Hz), temperature (from 0 to 450°C) and amplitude (ε from 5×10 to 10) range in binary Mg-0.8 wt%Mn (0.36 at%) and Mg-2 wt%Gd (0.31 at%) in as-extruded and annealed states was experimentally studied and analyzed, to characterize acting thermally activated and structural relaxation effects. Activation parameters for thermally activated anelastic effect and structural studies suggest that it is the grain boundary relaxation with dominating large angle boundaries, while the high-temperature background is mainly controlled by dislocations sliding. Pseudo peak at ∼290 °C (Mg-Mn) and ∼410 °C (Mg-Gd) is the result of the recrystallization process in the as-extruded samples, which indicates that the addition of Gd restricts the recrystallization of Mg compared with the addition of Mn. Analysis of amplitude dependencies of internal friction in the frames of Granato and Lücke approach suggests higher density of movable dislocations in as-extruded Mg-Mn alloy.

中文翻译：

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Mg-Mn 和 Mg-Gd 合金的迟弹性


二元 Mg-0.8wt%Mn (0.36at%) 和亚共振频率（从 0.01 到 100Hz）、温度（从 0 到 450°C）和振幅（ε 从 5×10 到 10）范围内的滞弹性弛豫对挤压状态和退火状态的 Mg-2wt%Gd (0.31at%) 进行了实验研究和分析，以表征热激活和结构松弛效应。热激活滞弹效应的激活参数和结构研究表明，这是以大角度晶界为主的晶界弛豫，而高温背景主要受位错滑动控制。 ~290 °C (Mg-Mn) 和~410 °C (Mg-Gd) 处的伪峰是挤压态样品中再结晶过程的结果，这表明 Gd 的添加限制了 Mg 的再结晶。添加Mn。对 Granato 和 Lücke 方法框架中内摩擦振幅依赖性的分析表明，挤压态 Mg-Mn 合金中的可动位错密度较高。