摘要
研究了铝锂二元和五元合金的内耗。采用倒扭摆法,测定了不同热处理和时效状态的铝锂合金在升温和降温过程中的内耗和剪切模量。测量频率为0.3～5.0Hz。观测到了铝锂二元和五元合金中各自不同的内耗峰(即晶界内耗峰,Ke Peak)。实验表明,与纯铝和传统的铝合金相比,铝锂合金葛峰的峰高值比较低,并且对应葛峰的温度较低。根据晶界粘滞性滑动模型,上述实验结果可以归因于溶质原子Li及其沉淀相δ′(Al_3Li)和δ(AlLi)对晶界滑动的阻尼。本文对铝锂合金在不同热处理状态下的显微组织结构进行了透射电镜TEM观察。
The internal friction of the binary and quinary aluminum-lithium alloys has been studied. By means of the inverted torsion pendulum, the internal friction and the shear modulus of the aluminum-lithium with different heat treatment and aging process have been measured in the course of ascending and descending temperatures. The grain boundary internal friction peaks are observed in the two kinds of aluminum-lithium alloys (Al-Li and Al-Li-Cu-Mg-Zr). Comparing with pure aluminum and the conventional aluminum alloy, the height of the Ke peaks of the alloys is lower and the peaks are situated at a lower temperature. Ac-cording to the viscous sliding model of grain boundary, these phenomena could be attributed to the grain boundary damping and pinning by the solute Li atoms and its precipitates. The TEM observations demonstrated the evidence for grain boundary precipitation.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
1993年第3期32-41,共10页
Journal of Beijing University of Aeronautics and Astronautics
关键词
铝锂合金
内耗
晶界沉淀
滑动模型
aluminum-lithium alloy, internal friction, grain boundary precipitation, viscous sliding model.
