Effect of hot deformation on microstructure and hardness of in-situ TiB2/7075 composite

Citation
L. Geng et al., Effect of hot deformation on microstructure and hardness of in-situ TiB2/7075 composite, J MAT SCI T, 17(6), 2001, pp. 675-676
Citations number
2
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN journal
1005-0302 → ACNP
Volume
17
Issue
6
Year of publication
2001
Pages
675 - 676
Database
ISI
SICI code
1005-0302(200111)17:6<675:EOHDOM>2.0.ZU;2-E
Abstract
Hardness of the TiB2/7075 composite increased with increasing deformation t emperature. In the annealed TiB2/7075 composite, a great amount of fiber-li ke MgZn2 phases (about 1 mum in length) and small MgZn2 phases (about 100 n m in size) were precipitated nearby the grain boundaries where the TiB2 par ticles exist. After deformation at 300 degreesC, some of the large precipit ates and all the small precipitates in these area dissolved into the matrix , meanwhile, fine precipitates were formed in grains. After deformation at 450 degreesC, all the precipitates in the annealed composite dissolved into the matrix, and new phases were precipitated in grains. The dissolution of the large fiber-like precipitate makes the saturation level of the matrix increased and leads to an increased solution hardening and natural aging, w hich contribute much to the hardening effect.