Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1606362 | Journal of Alloys and Compounds | 2016 | 12 Pages |
Abstract
The present study provided an efficient process combining pressureless sintering and subsequent canned hot extrusion to prepare a high-performance TiBw/Ti-6Al-4V composite with a columnar reinforced structure. Microstructure and mechanical performance for the as-extruded TiBw/Ti-6Al-4V composite was systematically investigated. The formation of TiB whiskers was significantly accelerated by the introduced high pressure and severe plastic deformation during the short canned extrusion compared to the pressureless sintering. With the development of highly preferred alignment of TiB whiskers along extrusion direction, a TiB columnar reinforced structure allied with a refined and irregular morphology in the Ti matrix was finally achieved in the as-extruded TiBw/Ti-6Al-4V composite. This led to a high relative density of â¼99.8% along with superior mechanical properties of â¼1282 MPa in ultimate tensile strength and â¼9.4% in fracture elongation at room temperature. Further investigation on high-temperature performance reveals that effective strengthening of the TiB columnar reinforced structure could be retained at 500 °C corresponding to the improved high-temperature strength over the as-extruded Ti-6Al-4V alloy by a 41% increase, but dramatically weakened at 600 °C related to the interface debonding between the TiB whiskers and the Ti matrix.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Wencong Zhang, Mengmeng Wang, Wenzhen Chen, Yangju Feng, Yang Yu,