Refinement of TiB reinforcements in TiB/Ti-2Al-6Sn titanium matrix composite via electroshock treatment
Document Type
Journal Article
Publication Title
Materials Characterization
Volume
180
Publisher
Elsevier
School
School of Engineering
RAS ID
36677
Funders
National Natural Science Foundation of China Application Foundation Frontier Project of Wuhan "Chu Tian Scholar" project of Hubei Province Fundamental Research Funds for the Central Universities Overseas Expertise Introduction Project for Discipline Innovation Innovative Research Team Development Program of Ministry of Education of China
Abstract
This work uses a novel method of electroshock treatment (EST) to refine the TiB reinforcement to nanometer in TiB/Ti-2Al-6Sn titanium matrix composite (TMC), with an aim to shed insights into improve the deformation coordination between reinforcements and matrix of TMCs. The resistivity of TiB/Ti-2Al-6Sn before and after EST was investigated, and the resistivity increased first and then decreased with the increase of EST time. The variation in resistivity was attributed to the generation of cracks in the reinforcement/matrix interfaces during EST. Microstructural characterization indicates that the TiB whiskers fractured into small particles with 50–312 nm in diameter under the thermal stress and extrusion of matrix during EST. The deformation of matrix could not yield to the deformation of TiB in a very short time and cracks were generated in TiB/matrix interfaces. In order to repair the cracks at TiB/matrix interfaces, external loading was adopted during EST. After EST with external loading, the TiB underwent refinement and cracks in the nano-TiB/matrix interfaces were repaired when the load was 0.3 MPa, due to the thermal and athermal effects of EST as well as the compressive stress of external loading. Combing EST and the external loading, the fracture strain of TiB/Ti-2Al-6Sn increased along with a small slight variation in yield strength. The variation in mechanical properties is attributed to the refinement of TiB and the repairing of cracks. All results indicate that EST is a valuable method to manipulate the size of TiB from micrometer to nanometer, realizing the refinement of TiB and providing a novel idea for improving the deformation coordination of TMCs.
DOI
10.1016/j.matchar.2021.111395
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Comments
Xie, L., Wu, Y., Yao, Y., Hua, L., Wang, L., Zhang, L. C., & Lu, W. (2021). Refinement of TiB reinforcements in TiB/Ti-2Al-6Sn titanium matrix composite via electroshock treatment. Materials Characterization, 180, article 111395. https://doi.org/10.1016/j.matchar.2021.111395