Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7977895 | Materials Science and Engineering: A | 2015 | 22 Pages |
Abstract
In situ synthesized TiB whisker reinforced 3.5 vol% TiBw/Ti6Al4V composites have been synthesized by pre-sintering and hot extrusion with steel cup processes. The effects of pre-sintering temperature and time on densification behavior and mechanical properties of the as-extruded composites were investigated. The results indicated that as-extruded TiBw/Ti64 composite sintered at 1100 °C had the highest relative density of 99.4% along with ultimate tensile strength of 1352 MPa and elongation of 4.72%. With increasing pre-sintering temperature from 900 to 1100 °C, the in situ synthesized TiB whiskers which construct a quasi-continuous network microstructure produced by pre-sintering and hot extrusion techniques grow rapidly, while the relative density of the composites increases obviously. At the same time, the fracture type changes from brittle fracture to the hybrid-fracture characteristic of plastic fracture and brittle fracture. The strengthening effects can attribute to the matrix refine and the in-situ reaction TiB whiskers reinforcement due to pre-sintering and hot extrusion plastic deformation. The results also suggest that the optimal pre-sintering and hot extrusion with steel cup techniques are sintered at 1100 °C for 1 h in consideration of the comprehensive properties and the cost.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Yang Yu, Wencong Zhang, Wenqian Dong, Jianlei Yang, Yangju Feng,