Core structure of a〈100〉 superdislocations in a single-crystal superalloy during high-temperature and low-stress creep. (3rd October 2015)

• Record Type: Journal Article
• Authors: Huang, Ming; Zhuo, Longchao; Xiong, Jichun; Li, Jiarong; Zhu, Jing
• Is Part Of: Philosophical magazine letters. Volume 95:Number 10(2015)
• Page Start: 496
• Page End: 503
• Publication Date: 2015-10-03
• Subjects: Ni-based single-crystal superalloys -- creep -- HRTEM -- dislocation structures -- atomic structure -- superdislocation; Condensed matter -- Periodicals; Physics -- Periodicals; Solid state physics -- Periodicals; Physique -- Périodiques; 530.41
• DOI: 10.1080/09500839.2015.1100763
• Languages: English
• ISSNs: 0950-0839

Abstract

Abstract : A thorough TEM analysis has been carried out to study the dislocations cutting into γ ′ phase in a single-crystal superalloy during uniaxial tensile creep under high-temperature and low-stress conditions. It is proved that the a〈100 〉 edge superdislocation originates from the interfacial a〈100 〉 dislocations and moves into the γ′ phase by pure climbing. And the dissociation of the a〈100 〉 superdislocation core into two a/2〈101〉 superpartial dislocations during uniaxial tensile creep has been identified by HRTEM method for the first time.