Temperature effects on the transition from Lomer-Cottrell locks to deformation twinning in a Ni-Co-based superalloy

• DOI: 10.1016/j.scriptamat.2016.07.033
• Publication Date: 2016-08-05T07:47:52Z
• Authors: Dongqing Qi; Baidong Fu; Kui Du; Tingting Yao; Chuanyong Cui; Jianxin Zhang; Hengqiang Ye
• Keywords: 0205 materials engineering; 02 engineering and technology

Abstract Deformation mechanisms of a Ni-Co-based superalloy at various temperatures were investigated with aberration corrected and conventional transmission electron microscopes. When deformed at intermediate temperature, Lomer-Cottrell locks were formed in primary γ′ precipitates in this superalloy; at high temperatures, however, microtwins become prominent. The transition from Lomer-Cottrell locks to microtwins with temperature increase is discussed, in particular, on the reordering process in the ordered γ′ precipitates during the deformation twinning.