Method to produce two-phase nanocomposites in solid state

L. He, L. F. Allard, E. Ma

Research output: Contribution to journalConference articlepeer-review

9 Scopus citations

Abstract

We demonstrate that full-density, bulk, two-phase nanocomposites can be produced starting from a powder mixture of two coarse-grained individual phases in equilibrium. Instead of going through liquid or vapor phase precursors, mixing is achieved through mechanical milling, a highly nonequilibrium driven process imposing external forcing. The precursor created is a supersaturated solid solution with nanocrystalline grain sizes. Upon subsequent hot consolidation to bulk samples, phase separation occurs on the scale of the nanograins, forming two-phase nanocomposites in situ. Transmission electron microscopy of the Cu60Fe40 sample presented in this paper confirm that, after full density processing using the sinter forging consolidation scheme, nanophase grains are maintained and a homogeneous two-phase microstructure is obtained.

Original languageEnglish
Pages (from-to)543-546
Number of pages4
JournalNanostructured Materials
Volume12
Issue number1
DOIs
StatePublished - 1999
Externally publishedYes
EventProceedings of the 1998 4th International Conference on Nanostructured Materials (NANO '98) - Stockholm, Swed
Duration: Jun 14 1998Jun 19 1998

Funding

This work has been supported by the National Science Foundation, Grant No. CMS-9409750 and CMS-9424324. Research performed at ORNL was sponsored by the SURA-ORNL-University Graduate Summer Research Program in Materials Science, and by the High Temperature Materials Laboratory User Program, ORNL, managed by Lockheed Martin Energy Research Corp. for the U.S. DOE under contract number DE-AC05960R22464.

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