Strengthening and Toughening Mechanisms of Continuous SiC Fiber-Reinforced TiAl4822/Ti6Al4V Layered Composite Prepared by Hot Pressing

Abstract

In order to improve the intrinsic brittleness of TiAl4822, Ti6Al4V alloy with outstanding ductility and toughness can be applied as a competitive candidate by constructing the TiAl4822/Ti6Al4V laminated composite. Continuous SiC fibers were introduced into the laminated composite to further enhance the comprehensive performance of the laminated composite. Using SiC fibers, TiAl4822 foil, and Ti6Al4V foil as raw materials, continuous SiC fiber-reinforced TiAl4822/Ti6Al4V layered composite material was fabricated through a vacuum hot-pressing method using the foil-fiber-foil method. A phase-structured interface with a specific sequence was formed between SiC fiber and Ti6Al4V matrix, exhibiting a thickness of 6 μm. A dense bonding interface between TiAl4822 and Ti6Al4V with a thickness of about 80 μm was obtained. No evident cracks or holes were observed at the interface. The resulting SiC fiber-reinforced composite material exhibited superior mechanical properties compared to the traditional TiAl4822/Ti6Al4V layered composite material. Specifically, relative to the unreinforced TiAl4822/Ti6Al4V composite, it had a tensile strength of 727.65 MPa (14.3% improvement), elongation at break of 1.42% (20.3% improvement), elastic modulus of 176 GPa (30.4% improvement), and flexural strength of 1353.6 MPa (21.5% improvement).

Received: 7 December 2024 | Revised: 14 March 2025 | Accepted: 15 April 2025

Conflicts of Interest

The authors declare that they have no conflicts of interest to this work.

Data Availability Statement

Data available on request from the corresponding author upon reasonable request.

Author Contribution Statement

Hongyan Wu: Writing – original draft. Shouyin Zhang: Conceptualization, Investigation, Resources, Data curation, Writing – review & editing. Kun Zhang: Methodology, Formal analysis, Writing – original draft. Baiping Lu: Supervision. Zhenjun Wang: Visualization, Funding acquisition.