Stress-rupture behavior of a Re-containing Ni-base single crystal superalloy at high temperatures  

作　　者：G.L.Wang D.Q.Qi J.L.Liu J.D.Liu J.G.Li Y.Z.Zhou X.F.Sun 

机构地区：[1]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

出　　处：《Journal of Materials Science & Technology》2023年第32期237-244,共8页材料科学技术（英文版）

基　　金：the National Science and Technology Major Project(Nos.J2019-VI-0023-0139 and J2019-VII-0004-0144);the National Natural Science Foundation of China(No.51871221);the National Key R&D Program of China(No.2020YFA0714900).

摘　　要：A Re-containing Ni-base single crystal superalloy was used to investigate the elementary processes associated with stress-rupture behavior at different temperatures where theγʹrafting occurs.At 900°C,the rupture behavior is mainly determined by the multiplication of dislocations within the wideningγchannels,which is closely linked with the propagation of microcracks along the inherentγ/γʹinterfaces.The rapid formation of lamellaγ/γʹraft structure,along with the developed-well interfacial dislocation networks,and its elastic instability are primarily responsible for the rupture behavior at 1100°C.There is a clear curvature tendency in the Larson-Miller plot of stress-rupture lifetime in relation to stress at high temperatures.It indicates that the influence extent ofγʹrafting on stress-rupture behavior is sensitive to the acting conditions of temperature and stress.

关 键 词：Ni-based single crystal superalloy Re effect γʹrafting Stress-rupture behavior Elementary process Larson-Miller plot 

分 类 号：TG132.3[一般工业技术—材料科学与工程]