Formation of amorphous materials
Abstract
Metastable amorphous or fine crystalline materials are formed by solid state reactions by diffusion of a metallic component into a solid compound or by diffusion of a gas into an intermetallic compound. The invention can be practiced on layers of metals deposited on an amorphous substrate or by intermixing powders with nucleating seed granules. All that is required is that the diffusion of the first component into the second component be much faster than the self-diffusion of the first component. The method is practiced at a temperature below the temperature at which the amorphous phase transforms into one or more crystalline phases and near or below the temperature at which the ratio of the rate of diffusion of the first component to the rate of self-diffusion is at least 104. This anomalous diffusion criteria is found in many binary, tertiary and higher ordered systems of alloys and appears to be found in all alloy systems that form amorphous materials by rapid quenching. The method of the invention can totally convert much larger dimensional materials to amorphous materials in practical periods of several hours or less.
- Inventors:
- Issue Date:
- Research Org.:
- California Institute of Technology (CalTech), Pasadena, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 865737
- Patent Number(s):
- 4564396
- Application Number:
- 06/462,441
- Assignee:
- California Institute of Technology (Pasadena, CA)
- Patent Classifications (CPCs):
-
B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER
C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS
- DOE Contract Number:
- AT03-81ER10870
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 1983 Jan 31
- Country of Publication:
- United States
- Language:
- English
- Subject:
- formation; amorphous; materials; metastable; fine; crystalline; formed; solid; reactions; diffusion; metallic; component; compound; gas; intermetallic; practiced; layers; metals; deposited; substrate; intermixing; powders; nucleating; seed; granules; required; faster; self-diffusion; method; temperature; below; phase; transforms; phases; near; ratio; rate; 10; anomalous; criteria; found; binary; tertiary; systems; alloys; appears; alloy; form; rapid; quenching; totally; convert; larger; dimensional; practical; periods; hours; amorphous phase; crystalline materials; amorphous materials; crystalline material; temperature below; intermetallic compound; crystalline phase; metallic component; amorphous substrate; rapid quenching; solid compound; rapid quench; fine crystalline; metallic compound; mixing powder; alloy systems; amorphous material; /148/419/420/
Citation Formats
Johnson, William L., and Schwarz, Ricardo B. Formation of amorphous materials. United States: N. p., 1986.
Web.
Johnson, William L., & Schwarz, Ricardo B. Formation of amorphous materials. United States.
Johnson, William L., and Schwarz, Ricardo B. Wed .
"Formation of amorphous materials". United States. https://www.osti.gov/servlets/purl/865737.
@article{osti_865737,
title = {Formation of amorphous materials},
author = {Johnson, William L. and Schwarz, Ricardo B.},
abstractNote = {Metastable amorphous or fine crystalline materials are formed by solid state reactions by diffusion of a metallic component into a solid compound or by diffusion of a gas into an intermetallic compound. The invention can be practiced on layers of metals deposited on an amorphous substrate or by intermixing powders with nucleating seed granules. All that is required is that the diffusion of the first component into the second component be much faster than the self-diffusion of the first component. The method is practiced at a temperature below the temperature at which the amorphous phase transforms into one or more crystalline phases and near or below the temperature at which the ratio of the rate of diffusion of the first component to the rate of self-diffusion is at least 104. This anomalous diffusion criteria is found in many binary, tertiary and higher ordered systems of alloys and appears to be found in all alloy systems that form amorphous materials by rapid quenching. The method of the invention can totally convert much larger dimensional materials to amorphous materials in practical periods of several hours or less.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}
Works referenced in this record:
Metastable alloy formation
journal, September 1978
- Poate, J. M.
- Journal of Vacuum Science and Technology, Vol. 15, Issue 5