Effect on microstructure and mechanical properties of in situ 6 wt%TiB2/Al–Zn–Mg–Cu composite subjected by two-step orthogonal deformation process

• Published in: Journal of materials research 2021-11, Vol.36 (21), p.4426-4437
• Main Authors: Huang, Jingcun, Xiang, Zhilei, Li, Jihao, Ma, Xiaozhao, Yang, Zian, Shen, Gaoliang, Wang, Zhitian, Chen, Ziyong
• Format: Article
• Language: English
• Subjects: Aluminum; Applied and Technical Physics; Biomaterials; Chemistry and Materials Science; Clusters; Copper; Deformation; Deformation effects; Inorganic Chemistry; Magnesium; Materials Engineering; Materials research; Materials Science; Mechanical properties; Nanotechnology; Phases; Strengthening; Titanium diboride; Yield strength; Zinc
• ISSN: 0884-2914; 2044-5326
• DOI: 10.1557/s43578-021-00341-z

TiB 2 particles clusters evolution, mechanical properties and strengthening mechanisms of in situ 6wt% TiB 2 /Al–Zn–Mg–Cu composites subjected by two-step deformation process were studied. The results suggest that large TiB 2 clusters and belts can hinder elements dissolution and diffusion, leading to partial transformation from T phase to S phase. Two-step orthogonal deformation can effectively break the TiB 2 clusters to release the wrapped phases, which is conductive to solution process. Low fraction of residual T and S phases, broken brittle phases and uniform TiB 2 distribution are in favor of mechanical properties. In T6 state, η’ and GP II are the main reinforcement phases, which can contribute to yield strength about 355.30 MPa estimated by strengthening model, dislocation reinforcement contribution is about 112.70 MPa. The 6wt% TiB 2 /Al–Zn–Mg–Cu composite subjected two-step deformation owns an excellent mechanical performance, 616.96 MPa (UTS), 552.00 MPa (YS), 9.67% (EL). Comparably, UTS, YS and EL of that improve by 16%, 15%, 265% in radial direction and 12%, 18%, 87% in axial direction than forged composite. Graphical abstract The 6wt% TiB 2 /Al–Zn–Mg–Cu composite subjected two-step orthogonal deformation owns an excellent mechanical performance, 616.96 MPa (UTS), 552 MPa (YS), 9.67% (EL). Comparably, the UTS, YS and EL of that improve by 16%, 15%, 265% in radial direction and 12%, 18%, 87% in axial direction than forged composite, respectively.