Multimodal grain structure and tensile properties of cold-rolled titanium after short-duration annealing

• Published in: Materials characterization 2020-02, Vol.160, p.110095, Article 110095
• Main Authors: Xu, Tengfei, Wang, Shiying, Wang, Wenchang, Liang, Penghua, Li, Xiaochen, Mitsuzaki, Naotoshi, Chen, Zhidong
• Format: Article
• Language: English
• Subjects: Ductility; Multimodal grain structure; Short-duration annealing; Strain hardening; Titanium
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2019.110095

In the present study, a multimodal grain structured commercially pure titanium composed of nanoscale grains (~19%), ultrafine grains (~69%), and coarse grains (~12%) has been obtained by employing cold rolling at room temperature, followed by a short-duration annealing. This structure exhibited a combination of high ultimate tensile strength (~745 MPa), large uniform elongation (~8.2%) and failure elongation (~24.8%). The high strength can be attributed to the nanoscale and ultrafine grains, and the enhanced ductility is mainly results from the improved strain hardening capability which is even higher than that of the as-received titanium after the true strain of ~0.044. The improved strain hardening capability is attribute to the multimodal grain structure which in favor of improving the capacity of dislocation storage. [Display omitted] •The effects of annealing temperature and time on the microstructures and properties of cold-rolled Ti were studied.•A multimodal structured-Ti was obtained by employing cold rolling at room temperature plus a short-duration annealing.•The tensile behaviors of multimodal structured-Ti were explained by microstructure and strain hardening rate.