The effect of crystallization state on the corrosion behaviour of Al-Ni-Y glassy alloys

Rinkel Jindal, Raja V Srinivasa, Mark Gibson, Christopher Hutchinson

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

Al-Ni-Y alloys processed through the amorphous state exhibit significant improvements in strength over conventional crystalline Al Alloys. As such, they may offer some promise in high-strength, weight critical applications such as aerospace if their other property combinations are acceptable. However, amorphous metals are highly non-equilibrium and the issues associated with their thermal stability have stimulated considerable interest, especially in terms of the effects of any partial crystallization on their properties. In this work, the influence of controlled states of crystallization on the corrosion resistance of rapidly solidified Al-Ni-Y amorphous ribbons in 3.5 wt. NaCl (pH 6.5) solution is studied. Differential scanning calorimetry and X-ray diffraction are used to determine the thermal stability of amorphous Al-Ni-Y ribbons. Two types of crystallites, FCC-Al and intermetallic phases were produced and their effect on the corrosion rate was studied by potentiodynamic polarization. The results show that the primary crystallized ribbons exhibit improved corrosion resistance compared with the as-spun, fully amorphous, secondary crystallized (i.e. containing intermetallic phase) or fully crystallized states. Possible physical origins of these effects are discussed.
Original languageEnglish
Title of host publicationCorrosion Conference and Expo 2012
EditorsOliver Moghissi
Place of PublicationHouston TX USA
PublisherNational Association of Corrosion Engineer (NACE)
Pages913 - 924
Number of pages12
Volume2
ISBN (Print)9781622760787
Publication statusPublished - 2012
EventNACE International - Corrosion 2012 - Salt Palace Convention Center, Salt Lake City, United States of America
Duration: 11 Mar 201215 Mar 2012
Conference number: 67th

Conference

ConferenceNACE International - Corrosion 2012
Abbreviated titleCorrosion 2012
CountryUnited States of America
CitySalt Lake City
Period11/03/1215/03/12

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