Abstract
In this paper, 2.5 vol% TiBw/TA15 composites were fabricated by low-energy milling and subsequent powder extrusion. After low-energy milling process, the fine TiB2 powders were adhered on the surface of the spherical TA15 powders. Next, the blended powders were extruded at 1100 °C with extrusion ratio of 10:1. The Widmanstatten α + β microstructure with thickness of 550–620 nm in α phase was obtained and the strong (0001)α//ED and (101)α//ED texture was formed after powder extrusion. The TiB whiskers (TiBw) twisted along the extrusion direction and led to the ‘wall’ structure. High-temperature tensile behavior of this studied composites was investigated at 800–950 °C with strain rate of 0.001–0.1 s−1. According to the stress-strain curves, the activation energy (Q) was calculated to be 325 kJ mol−1, higher than the TA15 matrix, which is due to the combined effect of phase morphology, extrusion texture and TiBw reinforcements. In addition, the tensile strain has effect on microstructure evolution. Static spheroidizing has been processed in the grip area of tensile sample. As the tensile strain increased, the volume fraction of and the average grain size α phase decreased. Moreover, voids nearby the TiBw reinforcements were observed due to the incoordination deformation between TiBw and TA15 matrix.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
