Characterization of Rapidly Solidified Alloys
Rept. for 1 Aug 1981-1 Jan 1982
JOHNS HOPKINS UNIV BALTIMORE MD CENTER FOR MATERIALS RESEARCH
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During the reporting period, advances were made in three main areas of study, dealing with the following the Al-Fe system Pd77Si17Cu6 the Phrasor powders. All three studies are designed to further our understanding of different phenomena that occur in the rapid solidification of useful metallic systems. We now have a better understanding of the structure and the solidification sequence of rapidly solidified Al-Fe alloys containing up to 34 wt Fe. In rapidly solidified ribbons of Pd77Si17Cu6 we were able to detect the first stages of crystallization following heat treatments, and then to observe the advancement of the crystallizing front. We had the first look at two of the Phrasor powders, with a particle size which starts at about 3nm, and detected some phenomena which are inherent to the technique. The only technical problem encountered during the reporting period was related to foil preparation for the Scanning Transmission Electron Microscope STEM, involving a few alloys, based mainly on silver. These difficulties are expected to be resolved with the purchase of a new ion miller and then these systems will be reinvestigated.
- Physical Chemistry
- Properties of Metals and Alloys