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Title: 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 10.sup.4. 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:
 [1];  [2]
  1. Pasadena, CA
  2. Westmont, IL
Issue Date:
Research Org.:
AT03-83ER13125
OSTI Identifier:
865737
Patent Number(s):
4564396
Assignee:
California Institute of Technology (Pasadena, CA)
Patent Classifications (CPCs):
C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS
B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER
DOE Contract Number:  
AT03-81ER10870
Resource Type:
Patent
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 10.sup.4. 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}
}

Patent:

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