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  • 1995-1999  (5)
  • 1
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    Unknown
    Solidification Dynamics of Silver Drops in a Free Fall Environment (1999)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: Silver drops (99.9%, 4, 5, 7, and 9 mm diameter) were levitated, melted, and released to fall through Marshall Space Flight Center's 105m drop tube in helium - 6% hydrogen and pure argon atmospheres. By systematically varying the initial superheat condition of the drop the extent of solidification prior to impact ranged from complete to none during the approximately 4.6s of free fall time. Comparison of the experimental observations is made with numerical solutions to a model of the heat transfer and solidification kinetics associated with cooling of the drop during free fall, particularly with regard to the fraction of liquid transformed. Analysis reveals the relative importance of the initial parameters affecting the cooling and solidification rates within the drop. A discussion of the conditions under which the actual observations deviate from the assumptions used in the model is presented.
    Keywords: Metals and Metallic Materials
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Novel Directional Solidification Processing of Hypermonotectic Alloys (1999)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: Gravity driven separation precludes uniform microstructural development during controlled directional solidification (DS) processing of hypermonotectic alloys. It is well established that liquid/liquid suspensions, in which the respective components are immiscible and have significant density differences, can be established and maintained by utilizing ultrasound. A historical introduction to this work is presented with the intent of establishing the basis for applying the phenomena to promote microstructural uniformity during controlled directional solidification processing of immiscible mixtures. Experimental work based on transparent organics, as well as salt systems, will be presented in view of the processing parameters.
    Keywords: Materials Processing
    Type: NASA Microgravity Materials Science Conference; 289-294; NASA/CP-1999-209092
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Utilizing Controlled Vibrations in a Microgravity Environment to Understand and Promote Microstructural Homogeneity During Floating-Zone Crystal Growth (1999)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: It has been demonstrated in floating-zone configurations utilizing silicone oil and nitrate salts that mechanically induced vibration effectively minimizes detrimental, gravity independent, thermocapillary flow. The processing parameters leading to crystal improvement and aspects of the on-going modeling effort are discussed. Plans for applying the crystal growth technique to commercially relevant materials, e.g., silicon, as well as the value of processing in a microgravity environment are presented.
    Keywords: Materials Processing
    Type: NASA Microgravity Materials Science Conference; 283-288; NASA/CP-1999-209092
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Microgravity Studies Offer Insights into Solidification Phenomena and Processing of Metals and Alloys (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The paper reviews historical aspects of solidification processing and the detrimental attributes associated with gravity-driven flow phenomena. Benefits of and avenues toward conducting experiments in a microgravity environment are presented and illustrated with relevant examples. Finally, some comments regarding the role of microgravity experimentation are given
    Keywords: Space Processing
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Microgravity Studies Offer Insights into Solidification Phenomena and Processing of Metals and Alloys (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The paper reviews historical aspects of solidification processing and the detrimental attributes associated with gravity-driven flow phenomena. Benefits of and avenues toward conducting experiments in a microgravity environment are presented and illustrated with relevant examples. Finally, some comments regarding the role of microgravity experimentation are given.
    Keywords: Space Processing
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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