(1. 中南大學(xué) 材料系， 長沙 410083；
2. 武漢大學(xué) 物理系， 武漢 430072)
摘 要: 研究了CuZnAl形狀記憶合金在壓應(yīng)力作用下進行不完全相變熱循環(huán)或在兩相區(qū)時效時相變曲線出現(xiàn)的“臺階”現(xiàn)象。結(jié)果表明：外加載荷或延長兩相區(qū)時效時間，均能促進“臺階”效應(yīng)的發(fā)展。記憶元件一旦出現(xiàn)“臺階”效應(yīng)，可在高于Af以上的適當溫度保溫一定時間來消除。“臺階”效應(yīng)可用馬氏體時效使馬氏體穩(wěn)定化，引起逆轉(zhuǎn)變溫度升高，及母相時效使母相有序度略有提高，使逆相變的相變溫度降低來解釋。
關(guān)鍵字: “臺階”效應(yīng); 馬氏體； 穩(wěn)定化; 有序度
（1. Department of Materials Science and Engineering,
Central South University, Changsha 410083, P.R.China;
2. Department of Physics, Wuhan University, Wuhan 430072, P.R.China）
Abstract:A plateau in the transformation curves was investigated for CuZnAl shape memory alloys which were aged in the twophase region or undergone incomplete heat cycles. It is showed that the increasing of load or aging time all accelerate the appearance of the plateau, and the plateau will be eliminated by complete transformation heat cycle. These plateaus are caused by the stabilized martensite of the sample which is aged in the twophase region and undergoes structural change.
Key words: plateau effect; martensite; stabilization; degree of order
