( 1. 江西科技師范學(xué)院 江西省材料表面工程重點(diǎn)實(shí)驗(yàn)室, 南昌 330013 ;
2. 中國(guó)科學(xué)院 金屬研究所， 沈陽(yáng) 110016)
摘 要: 采用差示掃描量熱儀研究了Ti50Ni35Cu15以及Ti50Ni45Cu5(摩爾分?jǐn)?shù)， %)形狀記憶合金的溫度記憶效應(yīng)。 結(jié)果表明： 溫度記憶效應(yīng)僅在Ti-Ni-Cu合金的逆轉(zhuǎn)變加熱過(guò)程出現(xiàn)， 在單斜結(jié)構(gòu)馬氏體與母相逆相變(B19′→B2)及正交結(jié)構(gòu)馬氏體與母相逆相變(B19→B2)過(guò)程中均能發(fā)生溫度記憶效應(yīng)； 在隨后的完全循環(huán)過(guò)程中， 溫度記憶記憶效應(yīng)不再出現(xiàn)， DSC相變曲線(xiàn)又“恢復(fù)”到其原始形態(tài)； 而在馬氏體相變冷卻過(guò)程中未發(fā)現(xiàn)溫度記憶效應(yīng)。 分析表明， 不完全相變過(guò)程中的彈性能再分布是可能的溫度記憶效應(yīng)機(jī)制。
關(guān)鍵字: 溫度記憶效應(yīng)； Ti-Ni-Cu合金； 形狀記憶合金； 不完全相變
Ti-Ni-Cu shape memory alloy
DUO Shu-wang1, LI Ming-sheng1, RONG Li-jian2
（ 1. Jiangxi Key Laboratory of Material Surface Engineering,
Jiangxi Science and Technology Normal University, Nanchang 330013, China;
2. Institute of Metal Research, Chinese Academy of Sciences,
Shenyang 110016, China）
Abstract: The temperature memory effect (TEM) of Ti50Ni35Cu15 and Ti50Ni45Cu5 (mole fraction, %) shape memory alloys was investigated by differential scanning calorimeter. The results indicate that TME of Ti-Ni-Cu alloy only exists in the heating process, and TME occurs both in B19′→B2 and B19→B2 transformation during heating process. But, there is no evidence of TME during cooling in the experimented alloy. The analysis suggests that this could be due to the re-distribution of the elastic strain energy during the incomplete transformation.
Key words: temperature memory effect; Ti-Ni-Cu alloy; shape memory alloy; incomplete transformation
