Metastable alloy materials produced by solid state reaction of compacted, mechanically deformed mixtures

Patent · Thu Jan 01 00:00:00 EST 1987

OSTI ID:866125

Atzmon, Michael ^[1]; Johnson, William L ^[2]; Verhoeven, John D ^[3]

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1. Herzlia, IL
2. Pasadena, CA
3. Ames, IA

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 (13) of powder or the sheets of foil are clad in a container (14) to form a disc (10). The disc (10) is cold-rolled between the nip (16) of rollers (18,20) to form a flattened disc (22). The grains (13) are further elongated by further rolling to form a very thin sheet (26) of a lamellar filamentary structure (FIG. 4) 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 (28) is thermally treated in oven (32) to form a composite sheet (33) containing metastable material (34) dispersed in unreacted polycrystalline material (36).

• 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
• OSTI ID: 866125
• Country of Publication: United States
• Language: English

Related Subjects

metastable
alloy
materials
produced
solid
reaction
compacted
mechanically
deformed
mixtures
bulk
amorphous
fine
crystalline
reacting
cold-worked
filamentary
precursors
metal
powder
intercalated
foils
cold-working
consolidates
metals
increases
interfacial
lowers
free
energy
reduces
characteristic
dimension
example
grains
13
sheets
foil
clad
container
14
form
disc
10
cold-rolled
nip
16
rollers
18
20
flattened
22
elongated
rolling
sheet
26
lamellar
structure
fig
containing
filaments
thickness
01
microns
diffusion
distance
time
substantially
reduced
28
thermally
treated
oven
32
composite
33
material
34
dispersed
unreacted
polycrystalline
36
free energy
substantially reduced
crystalline material
metal foil
metal powder
substantially reduce
polycrystalline material
alloy material
powder mixture
stable material
powder mixtures
mechanically deformed
composite sheet
metal foils
metastable alloy
thermally treated
fine crystalline
intercalated metal
alloy materials
containing filaments
/419/29/148/505/