Rapid Solidification of Highly Undercooled Aluminum Powders / JH. Perepezko, SE. LeBeau, BA. Mueller, GJ. Hildeman
- Conference Author:
- Rapidly Solidified Powder Aluminum Alloys (1984 : Philadelphia, Pennsylvania)
- Physical Description:
- 1 online resource (19 pages) : illustrations, figures, tables
- Additional Creators:
- Hildeman, GJ.
American Society for Testing and Materials
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- The amount of liquid undercooling attained during rapid solidification processing (RSP) is an important factor in determining microstructural development. An effective experimental method that may be applied in assessing undercooling potential involves the examination of a dispersion of stabilized, fine (5 to 20-¿̐ưm) liquid droplets. Substantial undercoolings (?T >= 160¿̐ưC) have been measured by differential thermal analysis for slowly cooled (30¿̐ưC/min) droplet emulsions of aluminum alloys. Results from Al-Si and Al-Fe alloys indicate that undercooling is a function of droplet size, melt super-heating, and material composition. Comparison studies have also been conducted relating the amount of undercooling to microstructural refinement in alloys prepared as droplet emulsions and by air atomization. The results indicate that at large undercooling (?T > 260¿̐ưC) droplet solidification can yield a microstructure similar to that formed in atomized powder. Microstructural variations with powder size are related not only to a changing cooling rate but also to a modified undercooling behavior. These observations highlight the role of undercooling in RSP and indicate that the droplet approach can be effective in examining potential aluminum powder metal alloys and in optimizing processing procedures for rapid quenching treatments.
- Dates of Publication and/or Sequential Designation:
- Volume 1986, Issue 890 (January 1986)
- 9780803149618 (e-ISBN)
- Digital File Characteristics:
- text file PDF
- Bibliography Note:
- Includes bibliographical references 31.
- Other Forms:
- Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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- Reproduction Note:
- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1986. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
- Technical Details:
- Mode of access: World Wide Web.
- Source of Acquisition:
- ASTM International PDF Purchase price USD25.
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