(1. 江西省科學(xué)院 江西省銅鎢新材料重點(diǎn)實(shí)驗(yàn)室，南昌 330029；
2. 中國(guó)石油大學(xué)(北京) 材料科學(xué)與工程學(xué)院，昌平 102249)
摘 要: 為使記憶合金展現(xiàn)寬溫域高阻尼特性，采用熔煉、熱鍛、軋制等手段制備原位自生的NbTi-NiTi 記憶合金復(fù)合材料。借助NbTi對(duì)NiTi的約束，拓寬NiTi相變溫度區(qū)間，獲得寬溫域相變阻尼。采用LMR-1低頻力學(xué)弛豫譜測(cè)試機(jī)測(cè)試樣品內(nèi)耗。完全相變測(cè)試結(jié)果表明：材料能在很寬的溫度范圍內(nèi)展現(xiàn)高阻尼特性，并隨著預(yù)變形量的增加，馬氏體逆相變阻尼峰的峰溫隨之升高，峰寬也隨之增加；預(yù)變形后，樣品在第一次加熱過(guò)程中阻尼峰的峰溫較高，且峰較寬，而第二次加熱，阻尼峰溫和寬度都明顯降低；測(cè)試中材料的動(dòng)態(tài)模量也伴有相同的變化。不完全相變測(cè)試結(jié)果表明：內(nèi)耗曲線出現(xiàn)雙阻尼峰，而動(dòng)態(tài)模量曲線出現(xiàn)階梯式升高現(xiàn)象，且內(nèi)耗曲線和動(dòng)態(tài)模量曲線都展現(xiàn)出溫度記憶效應(yīng)。
關(guān)鍵字: NiTi-NbTi復(fù)合材料；形狀記憶合金；約束態(tài)馬氏體相變
（1. Jiangxi Key Laboratory of Advanced Copper and Tungsten Materials, Jiangxi Academy of Sciences, Nanchang 330029, China;
2. Department of Materials Science and Engineering, China University of Petroleum-Beijing, Changping 102249, China）
Abstract:In order to obtain high damping capacity within wide temperature window by enlarging the transformation temperature window of NiTi shape memory alloy (SMA) during constraint transformation, an in-situ NbTi-NiTi composite was prepared by vacuum induction melting, hot forging and cold rolling processing. The complete and incomplete constraint transformation damping behavior of the composite was studied by a low-frequency mechanical analyzer LMA-1 testing system. The results show that the predeformed samples can exhibit high damping capacity with in a very wide temperature range, and both the peak temperature and the width of the internal peak increase with the pre-deformation level increasing. In the first heating process, the internal friction peak shows a higher peak temperature and a wider peak temperature range than that of the second heating. During the second heating process, the internal friction peak temperature decreases and the range of the peak becomes narrower than that of the first heating process. The relative modulus curves show the same variation trend. Furthermore, a stepped increasing of relative modulus curve and a peak splitting of damping curve which exhibits the temperature memory effect observed in incomplete constraint transformation.
Key words: NiTi-NbTi composite; shape memory alloy; constraint martensitic transformation
