(1.西北化有色金屬研究院，寶雞721014；
2.東北大學(xué)材料科學(xué)與工程系，沈陽(yáng)110006)
摘 要: 采用精密自動(dòng)絕熱量熱裝置測(cè)定了Ni47Ti44Nb9和Nb80Ti14Ni6合金60~350K溫區(qū)的熱容，并將熱容實(shí)測(cè)值用最小二乘法進(jìn)行了曲線擬合。在合金摩爾熱容加和原則基礎(chǔ)上，計(jì)算了Ni47Ti44Nb9合金中TiNi基體相的熱容。Ni47Ti44Nb9合金在215-~260K范圍內(nèi)發(fā)生的相變是TiNi相的熱彈性馬氏體相變。相變起始溫度(As)為222 K，相變終了溫度(Af)為255 K，相變焓△H= 411.9士2. 5J·mol-1，相變熵△S= 1.76士0. 01J·K-1·mol-1。
關(guān)鍵字: Ni47Ti44Nb9合金 熱容 熱彈性馬氏體相變 絕熱量熱裝置
PHASE IN Ni47Ti44Nb9ALLOY
（1．Northwest Institute for Nonferrous Metal Research,Baoji 721014
2.Department of Materials Science and Engineering
Northeastern University,Shenyang 110006）
Abstract:The heat capacities of Ni47Ti44Nb9and Nb80Ti14Ni6alloys in the temperature range from 60 to 350K were measured by means of an adiabatic calorimeter, and experimental data of heat capacity of Ni47Ti44Nb9 alloy were fitted by the least square method. The heat capacity of TiNi phase in Ni47Ti44Nb9alloy was calculated on the basis of additivity of molar heat capacity. The transition peak between 215K and 260K was associated with the reverse thermoelastic martensitic transformation. Transformation start temperature, transformation finish temperature, transformation enthalpy and entropy were determined to beAs=222 K,Af=255 K,ΔH=411.9±2.5 Jmol-1,ΔS=1.76±0.01JK-1·mol-1, respectively.
Key words:Ni47Ti44Nb9alloy heat capacity thermoelastic martensitic transformation adiabtic calorimeter
Key words: Ni47Ti44Nb9alloy heat capacity thermoelastic martensitic transformation adiabtic calorimeter
