Deformation micro-twinning arising at high temperatures in a Ni-Co-based superalloy  

作　　者：Zijian Zhou Rui Zhang Chuanyong Cui Yizhou Zhou Xiaofeng Sun Jinglong Qu Yu Gu Jinhui Du Yi Tan 

机构地区：[1]Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China [3]High Temperature Materials Research Division,Central Iron&Steel Research Institute,Beijing 100081,China [4]Beijing CISRI-Gaona Materials Technology Co.,Ltd.,Beijing 100081,China [5]Key Laboratory of Materials Modification by Laser,Ion,and Electron Beams(Ministry of Education),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China

出　　处：《Journal of Materials Science & Technology》2022年第20期10-18,共9页材料科学技术（英文版）

基　　金：the National Key R&D Program of China(Nos.2019YFA0705300 and 2017YFA0700703);the National Science and Technology Major Project of China(No.2019-VI-0006-0120);the IMR Innovation Fund(No.2021-PY09);the Doctoral Start-up Foundation of Liaoning Province(No.2020-BS-007).

摘　　要：Deformation twinning is an important deformation mechanism in nickel-based superalloys. For superalloys, deformation twins are generally observed at low or intermediate temperatures and high strain rates;however, the appearance of microtwins(MTs) at high temperatures has rarely been reported. In this study, transmission electron microscopy(TEM) was used to study MT formation in Ni-Co-based superalloys following compression at 1120 °C/1 s. The deformation behavior was discussed in detail to reveal the mechanism of MT formation. The twinning mechanism at elevated temperatures was theoretically attributed to the low stacking fault energy(SFE) and poor dislocation-driven deformations caused by the high strain rate in specific directions.

关 键 词：Deformation twinning Ni-Co-based superalloy High temperatures Loading direction Stacking fault energy 

分 类 号：TG132.3[一般工业技术—材料科学与工程]