Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9796329 | Materials Science and Engineering: A | 2005 | 8 Pages |
Abstract
The alloy Ti-6Al-4V was modified by addition of 10 wt.% tungsten through powder metallurgy. Depending on the initial W powder size, different materials were formed after powder densification: (i) “alloys” for fine (0.7 and 2 μm) W powders which were almost completely dissolved in the Ti-6Al-4V matrix; (ii) “alloyed composites” for intermediate (12 and <45 μm) W powders which were partially dissolved; (iii) and “composites” for coarse (<250 μm) W powders which were nearly un-dissolved. In all cases, tungsten strengthens Ti-6Al-4V, but much more so when dissolved in the matrix than as a second phase. Ductility was not affected by W additions for the fully-dissolved alloys, but was reduced in the case of composites with W particles, which exhibited fracture or pull-out from the matrix. Flaw sensitivity was apparent from strain hardening being much lower in tension than in compression, and from a much reduced ductility exhibited by one specimen with residual porosity.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Heeman Choe, Susan M. Abkowitz, Stanley Abkowitz, David C. Dunand,