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Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005228
EISBN: 978-1-62708-187-0
... discusses various microgravity solidification experiments that involve pure metals, alloys, and semiconductors and presents the official NASA acronyms for them. MEPHISTO, TEMPUS, the isothermal dendritic growth experiment, and advanced gradient heating facility, are also discussed. crystal growth...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005522
EISBN: 978-1-62708-197-9
... microgravity solidification thermophysical properties FOR A WIDE RANGE of new or better products, solidification processing of metallic materials from the melt is a step of uppermost importance in the industrial production chain. Examples of such advanced products include turbine blades for energy...
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Published: 01 November 2010
Fig. 7 (a) Postmortem observation of transverse cross section of a columnar dendritic array formed in microgravity at V = 4.2 μm/s and G = 30 K/cm in Al-26wt%Cu (D1-Spacelab mission, 1985), with huge dendrite spacing (1.5 mm) compared to that on Earth (450 μm). (b) Outputs: microgravity More
Image
Published: 01 December 2008
Fig. 1 Left: Astronauts at work on orbit in Spacelab . Right: United States Microgravity Payload-4 configuration of microgravity solidification experiments MEPHISTO, AADSF, and IDGE in the open Shuttle bay during STS-87 (see text for a description of experiments). Columbia is flying More
Image
Published: 01 November 2010
dendritic branches that are not identical to one another, because the arms are not feeling neighbor interactions at the same time. (c) Input on the columnar-to-equiaxed transition in unrefined Al-7wt%Si from the microgravity experiment MACE A in the sounding rocket Maxus 7 and corresponding R2sol More
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Published: 01 November 2010
for the Study of Critical Liquids and Crystallization (DECLIC)-Directional Solidification Insert of the French Space Agency, CNES ( Ref 41 , 42 ), showing that the localization of vertical dendrites at the center in the ground experiment (a) is effectively cured in microgravity experiments under diffusion More
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Published: 01 December 2004
Fig. 24 Surface-rendered 3D microstructure of tungsten grains reconstructed from a stack of serial sections for specimens processed in microgravity for 1 min. This segment is about 5% of the total serially sectioned microstructural volume. Source: Ref 30 More
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Published: 01 December 2004
Fig. 33 Bivariate distribution of three-dimensional coordination numbers of tungsten grains in a 83 wt% W-Ni-Fe alloy specimen liquid phase sintered in microgravity environment for 1 min at 1507 °C (2745 °F). The Z -axis is the fraction of grains having a given coordination number, and grain More
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Published: 01 December 2004
Fig. 22 Typical microstructure of an 83W-11.9Ni-5.1Fe (wt%) alloy specimen, liquid phase sintered at 1780 K for 1 min in a microgravity environment. (a) A montage of 25 microstructural fields, which is digitally compressed for display. (b) Each field of view (FOV) (e.g., PQRS) in montage More
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Published: 01 November 2010
17 ) in microgravity (d) with regular equiaxed grains and (e) at 1 g with a strong settling effect More
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Published: 01 November 2010
(bright or green area at top of sphere) elements at this computation time step. Courtesy of Ch.-A. Gandin, Centre for Material Forming (CEMEF), Chill Cooling for the Electro-Magnetic Levitator in Relation with Continuous Casting of Steel (CCEMLCC), European Space Agency-Microgravity Applications Promotion More
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001465
EISBN: 978-1-62708-173-3
... Space presents a unique welding environment and many technological challenges. The most obvious and dramatic factors are microgravity and high vacuum. Microgravity in earth orbit occurs due to the centrifugal force of the orbiting craft that counters the effects of gravity, making the spacecraft and all...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005514
EISBN: 978-1-62708-197-9
... be achieved ( Ref 4 ). Measurement of properties in microgravity: This technique uses drop tubes and suborbital (parabolic flights and sounding rockets) and space flights. A number of advantages are claimed, such as the precise control of the surrounding atmosphere, the elimination of gravitational...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003759
EISBN: 978-1-62708-177-1
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005227
EISBN: 978-1-62708-187-0
... with ZrO 2 . Source: Ref 60 Research on particle pushing by solidifying interfaces in cast MMCs has been focused on modeling the effects of thermal properties ( 24 ), solute diffusion ( Ref 13 ), gravity, and microgravity ( Ref 36 ). Other areas of focus have included the effects of convection...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005538
EISBN: 978-1-62708-197-9
... Stress Data for the Simulation of Metal-Forming Processes,” “Thermophysical Properties,” “Thermophysical Properties of Liquids and Solidification Microstructure Characteristics: Benchmark Data Generated in Microgravity,” “Measurement of Thermophysical Properties at High Temperatures for Liquid...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003760
EISBN: 978-1-62708-177-1
... Example 8: Grain-Size Distribution Measurements in a Liquid Phase Sintered Alloy <xref rid="a0003760-ref30" ref-type="bibr">(Ref 30)</xref> Grain-size distribution measurements were performed on a 83W-11.9Ni-5.1Fe (wt%) alloy specimen, liquid phase sintered at 1780 K for 1 min in a microgravity...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006033
EISBN: 978-1-62708-175-7
... microgravity conditions, to then predict the expected shapes for various gravitational conditions: Earth, Moon, Mars, and in space. The results show that gravity affects shape distortion during sintering ( Ref 40 ). Accordingly, the computer simulations can be used to reverse engineer the green component...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005502
EISBN: 978-1-62708-197-9
... is thermally softened to a point where the internal sintering stress can induce densification.) Figure 11 shows sintering simulation results for a tungsten heavy alloy, relying on test data taken on Earth and under microgravity conditions, to then predict the expected shapes for various gravitational...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005240
EISBN: 978-1-62708-187-0
... using transient methods Choose crucible materials that contact the sample to minimize reactions Eliminate container levitation Measure properties in microgravity Control the composition of the atmosphere Mills et al. ( Ref 24 ) describe the necessity to exercise care when analyzing...