Experimental investigation of a Portevin-Le Chatelier band in Ni–Co-based superalloys in relation toγ’precipitates at 500℃  

作　　者：Yanke Liu Yulong Cai Chenggang Tian Guoliang Zhang Guoming Han Shihua Fu Chuanyong Cui Qingchuan Zhang 

机构地区：[1]CAS Key Laboratory of Mechanical Behavior and Design of Materials,University of Science and Technology of China,Hefei,230027,China [2]Superalloy Division,Institute of Metal Research,Chinese Academy of Science,Shenyang,110016,China [3]AVIC Commercial Aircraft Engine Co.,Ltd,Shanghai,201108,China [4]Hainan University,Haikou,570228,China

出　　处：《Journal of Materials Science & Technology》2020年第14期35-41,共7页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11335010,51271174,11802080 and 11627803);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB22040502)。

摘　　要：The macroscopically localized deformation behaviors of Ni–Co-based superalloys with differentγ’precipitate content were investigated at 500?C and 1×10-4 s-1 via an in situ method namely,digital image correlation(DIC).The DIC results showed that the serrated flow of the stress–strain curves was accompanied by localized deformation of the specimens.The fracture morphology was characterized mainly by transgranular fracture with numerous dimples in the lowγ’content alloy,and intergranular fracture with large fracture section in the highγ’content alloy.The Portevin–Le Chatelier(PLC)effect occurred in the investigated Ni–Co-based superalloys.Furthermore,the localized deformation of the highγ’content alloy was more severe than that of the lowγ’content alloy,and the band width was slightly larger.Moreover,for the first-time ever,a special propagation feature,namely±60?zigzag bands characterized by head-to-tail connections,was observed in the highγ’content alloy.

关 键 词：γ’Precipitate Ni–Co-based superalloy Dynamic strain aging Portevin–Le Chatelier effect Digital image correlation 

分 类 号：TG132.3[一般工业技术—材料科学与工程]