Title

Synchrotron X-Rays Monitoring Nano-Aluminum Grain Growth Of A Metal Matrix Composite Under Thermo-Mechanical Conditions

Abstract

The experimental in situ synchrotron study presented here examines the micro structural features of trimodal Aluminum Metal Matrix Composites (MMCs) that influence their mechanical properties. The thermomechanical environment under which these MMCs, consisting of coarse-grained and nanocrystalline aluminum as well as boron carbide reinforcement particles, are manufactured is captured through in situ highenergy X-ray characterization. Results of peak identification indicate the presence of dispersoids, Al4C3, FeAl6, and AlN, formed after cryomilling and analysis of the peaks provide quantitative volume fractions of these compounds in the range of 2.6%, 1.9% and 1.2% respectively. The full width half maximum (FWHM) values of the X-ray diffraction data, collected over time from the sample, were analyzed to establish the change in nano-Aluminum grain size as a function of temperature and applied compressive load. Results monitor the rate of growth in nano-aluminum grain size with an overall increase of 101nm under a compressive stress of 50 MPa with a temperature ramp of 5°C/min for 25-315°C. The results will enable mechanical properties of these MMCs to be correlated with quantitative values of dispersoids to maximize their high strength potential. In addition, the findings on dispersoid content and rate of grain growth provide significant information on processing parameters towards optimizing the manufacturing of these materials. © 2012 AIAA.

Publication Date

12-1-2012

Publication Title

Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

84881419187 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84881419187

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