Metastable alloy materials produced by solid state reaction of compacted, mechanically deformed mixtures
Bulk metastable, amorphous or fine crystalline alloy materials are produced by reacting cold-worked, mechanically deformed filamentary precursors such as metal powder mixtures or intercalated metal foils. Cold-working consolidates the metals, increases the interfacial area, lowers the free energy for reaction, and reduces at least one characteristic dimension of the metals. For example, the grains of powder or the sheets of foil are clad in a container to form a disc. The disc is cold-rolled between the nip of rollers to form a flattened disc. The grains are further elongated by further rolling to form a very thin sheet of a lamellar filamentary structure containing filaments having a thickness of less than 0.01 microns. Thus, diffusion distance and time for reaction are substantially reduced when the flattened foil is thermally treated in oven to form a composite sheet containing metastable material dispersed in unreacted polycrystalline material. 4 figs.
- Research Organization:
- California Institute of Technology (CalTech), Pasadena, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AT03-81ER10870; AM03-76SF00767
- Assignee:
- California Institute of Technology (Pasadena, CA)
- Patent Number(s):
- US 4640816; A
- Application Number:
- PPN: US 6-645847
- OSTI ID:
- 7007692
- Resource Relation:
- Patent File Date: 31 Aug 1984
- Country of Publication:
- United States
- Language:
- English
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