Effects of Ce on the thermal stability of the Ω phase in a cast aluminum metal matrix composite

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Authors

Colleges, School and Institutes

External organisations

  • Aeromet International PLC
  • Controls and Data Services

Abstract

This work assesses the effect of Ce additions on the thermal stability of the Ω phase in an aluminum alloy matrix composite. Several additions of Ce, up to 1.5 wt. %, were made to an AA205 alloy, a novel MMC, and the thermal stability of the Ω phase tested at 230°C, for up to 100 hours. Microstructural evaluation was carried out with optical microscopy and scanning electron microscopy (SEM). In addition, hardness tests were carried out during the 100 hours. The results showed that when the reinforcement particles were present in the alloy, the Ce did not have any beneficial effects on mechanical properties. In particular, the Ce poisoned the grain refinement of the alloy by nucleating around the TiB2 particles. Energy dispersive X-ray spectroscopy (EDS) suggested the Ce-phase to be CeTi2Al20.

Details

Original languageEnglish
Title of host publicationTMS Annual Meeting
Publication statusPublished - 2015
EventAdvances in the Science and Engineering of Casting Solidification: An MPMD Symposium Honoring Doru Michael Stefanescu - TMS 2015 144th Annual Meeting and Exhibition - Orlando, United States
Duration: 15 Mar 201519 Mar 2015

Conference

ConferenceAdvances in the Science and Engineering of Casting Solidification: An MPMD Symposium Honoring Doru Michael Stefanescu - TMS 2015 144th Annual Meeting and Exhibition
CountryUnited States
CityOrlando
Period15/03/1519/03/15

Keywords

  • Aluminum alloys, Cerium, Metal matrix composite