NbCr2/Nb合金高温力学行为  

High Temperature Mechanical Behavior of NbCr2/Nb Alloy

作　　者：邓莉萍[1,2] 鲁世强 汤斌兵[3] 雷志立[2] 高军 Deng Liping;Lu Shiqiang;Tang Binbing;Lei Zhili;Gao Jun(Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Nanchang Hangkong University,Nanchang 330063,China;Nanchang University,Nanchang 330031,China)

机构地区：[1]南京航空航天大学,江苏南京210016 [2]南昌航空大学,江西南昌330063 [3]南昌大学,江西南昌330031

出　　处：《稀有金属材料与工程》2019年第5期1534-1538,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51074092);江西省自然科学基金(20161BAB206113);江西省教育厅落地计划项目(KJLD14056);江西省教育厅科技计划(GJJ160677)

摘　　要：在800~1200℃的变形温度,0.001~0.1 s-1的应变速率条件下对通过机械合金化+热压工艺制备的成分为Nb-22.5Cr的NbCr2/Nb合金进行了高温压缩试验,研究了合金的高温力学行为,并通过透射电子显微镜观察分析了合金的变形机制。结果表明:NbCr2/Nb合金的峰值强度随着变形温度的升高,应变速率的降低而下降。基体Nb的变形机制主要为位错的滑移;而NbCr2的变形机制是通过层错、孪晶、不全位错等方式进行。NbCr2/Nb alloy with the composition of Nb-22.5at%Cr was prepared by mechanical alloying and hot pressing process.Then compression tests were carried out under the condition of 800-1200 ℃ and 0.001~0.1 s^-1.High temperature mechanical behavior and deformation mechanisms of the alloy were investigated by conventional transmission electron microscopy.The results show that the peak strength of the NbCr2/Nb alloy decreases with the increase of deformation temperature and the decrease of strain rate.The main deformation mechanism of Nb matrix is the slip of dislocation.While,the deformation mechanism of the Laves phase NbCr2 is through stacking fault/twins and partial dislocation.

关 键 词：NbCr2/Nb合金 高温力学性能 位错 层错/孪晶 

分 类 号：TG146.416[一般工业技术—材料科学与工程]