Unveiling the microstructure evolution and the short-time tensile creep behavior in the CuCrZr alloy

• Published in: Materials characterization Vol. 216; p. 114305
• Main Authors: Luo, Yihao, Liu, Xiao, Huang, Liuyi, Wu, Youliang, Zhao, Shihong, Zhang, Hang, Yu, Gaofeng, Liu, Min, He, Junjing, Liu, Jiabin, Fang, Youtong
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.10.2024
• Subjects: Cavities; Creep properties; Cu alloy; Precipitates; Texture; Cu alloy; Cavities; Creep properties; Precipitates; Texture
• ISSN: 1044-5803
• DOI: 10.1016/j.matchar.2024.114305

The creep behavior of the CuCrZr alloy, used in the combustion chamber wall of reusable launch vehicles, was investigated at 600-700 K and 150–250 MPa. Results demonstrate significant differences in the creep behavior, microstructure evolution including texture component, dislocation configurations and cavities at 600 K and 700 K, particularly at 250 MPa. At 600 K, the creep life exceeds 400 h, while at 700 K it drops below 0.5 h. The texture components evolved at 600 K-250 MPa are more balanced between hard texture (Brass texture) and soft texture (Goss texture and R-Goss texture). The texture components at 700 K-250 MPa are integrally biased toward the soft texture, implying that it is favorable to accelerate creep strain. The introduced high-density dislocations before creep act as an effective barrier to impede the motion of dislocations at 600 K, inducing long-time dynamic balance of work hardening and recovery softening, while the pre-creep dense dislocations act as an energy supplement at 700 K, promoting that recovery softening dominates the creep process. The dense dislocations can provide energetic support for cavity nucleation. •Creep of CuCrZr was tested at typical service conditions of combustion chamber.•CuCrZr exhibited different creep life between 600 K-250 MPa and 700 K-250 MPa.•Ratio of hard to soft orientation plays important role in creep behavior of CuCrZr.•Pristine dislocations hinder following dislocation move when creep at 600 K.•Pristine dislocations promote recovery softening when creep at 700 K.