摘要
研究了(SIM+SME)训练法中的Cu-Zn-Al合金单向形状记忆效应η_ο和双向形状记忆效应η_τ。结果表明:随训练次数增加,位错增加,晶格原子有序度降低,单向形状记忆效应先急剧下降,然后缓慢下降和趋于稳定。基本稳定时的单向形状记忆效应不到初时值的50％。伴随位错增加,引入更多择优取向位错,促使形成更多择优取向马氏体,导致双向形状记忆效应急剧上升,训练9次之内出现峰值,然后缓慢上升和趋于稳定。基本稳定时的双向形状记忆效应相当于峰值的64％～88％。同时,随训练次数增加,单向记忆的动作敏感性下降,然后趋于稳定。与初期动作敏感性值相比,1号合金基本稳定时下降58％。在元件设计中应注意动作敏感性下降问题和形状记忆效应下降问题。
Shape memory effects on Cu-Zn-Al alloys trained with (SIM+SME) shape memory training method have been investigated. The results show that one-way shape memory effect η0 firstly decreases rapidly, then slowly and finally keeps stable with the increase of the training cycle where a large amount of dislocation slip movement and dislocation are produced. The η0 arriving at stable is less than the original η0 by 50%. However the two-way shape memory effectηr firstly increases rapidly to a peak value at training cycle 10, then decreases slowly and finally keeps stable. The ηT up to 64%-88% of peak value. At the same time, shape memory sensitivity deteriorates after (SIM+SME) training. The shape memory sensitivity at stability declines the original value by 58%. The deterioration of shape memory effect and shape memory sensitivity after training should be paid great attention during designing of shape memory device.
出处
《航空材料学报》
EI
CAS
CSCD
2004年第5期7-10,14,共5页
Journal of Aeronautical Materials
基金
国家自然科学基金(59972066)
