Microstructure and degradation behavior of forged -- alloys.
- Resource Type
- Article
- Authors
- Xu, Zhigang; Hodgson, Michael A.; Cao, Peng
- Source
- International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics. 4/30/2015, Vol. 29 Issue 10/11, p-1. 6p.
- Subject
- *METAL microstructure
*ALLOYS
*CHEMICAL decomposition
*BIOMATERIALS
*PHASE transitions
*METALWORK
*GRAIN size
- Language
- ISSN
- 0217-9792
This work presents a comparative study of a series of -- alloys proposed as degradable biomaterials for medical applications. Five -28wt.%-x (where x = 0 to 8 wt.%) alloys were fabricated by an arc-melting method. All the as-cast alloys were subsequently subjected to homogenization treatment and hot forging. The microstructure and phase constituents were investigated. It is found that the grain size of the as-forged alloys ranged approximately from 30 to 50 μm. The as-forged -- alloys containing from 2 to 6 wt.% was comprised of duplex martensitic ε and austenitic γ phases; however, the -free and 8 wt.% alloys only consisted of a single γ phase. After 30 days of static immersion test in a simulated body fluid (SBF) medium, it is found that pitting and general corrosion occur on the sample surfaces. Potentiodynamic analysis reveals that the degradation rate of the -- alloys increased gradually with content up to 6 wt.%, beyond which the degradation slows down. [ABSTRACT FROM AUTHOR]