Deformation of Rapidly Solidified Oxide Dispersion Strengthened Titanium Alloys PDF Download
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Author: Stephen L. Kampe
Publisher:
ISBN:
Category :
Languages : en
Pages : 202
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Book Description
Author: Stephen L. Kampe
Publisher:
ISBN:
Category :
Languages : en
Pages : 202
Get Book Here
Book Description
Author: S. L. Kampe
Publisher:
ISBN:
Category :
Languages : en
Pages : 37
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Book Description
The influence of erbium on the flow behavior of titanium and titanium-aluminum base alloys has been investigated over a range of strain rates and temperatures (25 deg - 775 deg C). Data from as hot-extruded bulk specimens indicate that, although oxide dispersion strengthening can be large under certain conditions, the strengthening is minimal in fine-grain material subjected to low strain-rate deformation at high temperatures. Both micro-structural observations and an analysis of the flow data indicate profuse grain boundary sliding under these conditions. Grain coarsening anneals, which also coarsen the dispersoids and increase their population along grain boundaries, result in significantly improved high temperature flow strengths, especially in the high temperature/low strain-rate regime. Keywords: Deformation, Creep, Rapidly solidification, Dispersion strengthening, Titanium alloys.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 69
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Book Description
A major challenge in the development of dispersion-hardened alloys is to produce a high volume-fraction of the fine hardening particles. This challenge has been met through the use of Rapid Solidification Technology (RST). Application of RST to titanium alloys can produce oxide-dispersion-strengthened alloys having large volume-fractions of
Author: Thomas A. Gaspar
Publisher:
ISBN:
Category : Metal castings
Languages : en
Pages : 106
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Book Description
Author: D. J. Maykuth
Publisher:
ISBN:
Category : Sheet-metal work
Languages : en
Pages : 164
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722710750
Category :
Languages : en
Pages : 94
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Book Description
A pilot plant scale furnace was designed and constructed for casting titanium alloy strips. The furnace combines plasma arc skull melting techniques with melt overflow rapid solidification technology. A mathematical model of the melting and casting process was developed. The furnace cast strip of a suitable length and width for use with honeycomb structures. Titanium alloys Ti-6Al-4V and Ti-14Al-21 Nb were successfully cast into strips. The strips were evaluated by optical metallography, microhardness measurements, chemical analysis, and cold rolling. Gaspar, Thomas A. and Bruce, Thomas J., Jr. and Hackman, Lloyd E. and Brasmer, Susan E. and Dantzig, Jonathan A. and Baeslack, William A., III Unspecified Center...
Author: Donald A. Koss
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Book Description
Progress is reviewed for a research program whose primary purpose is to establish a fundamental understanding of the applications and consequences of selected advanced processing techniques to high performance alloys. The broadly-ranged research effort includes studies of powder processing (hot isostatic pressing), fracture of alloys containing processing-induced defects (porosity), and application of advanced processing techniques to high performance alloys (rapidly solidified, dispersion-strengthened titanium alloys). Many aspects of the program also constitute fundamental studies of deformation and fracture utilizing engineering alloys containing processing-induced defects. Progress for the period October 1, 1985 to December 31, 1985 is reviewed for the following parts of the research program: the influence of void/pore distributions on fracture, hot isostatic pressing of metallic powders, deformation of rapidly solidified Ti alloys at elevated temperatures, and strain-path effects and the combined influence of stress state and grain size on the fracture of alloys containing hydrides.
Author: Carl R. Johnson
Publisher:
ISBN:
Category : Launch vehicles (Astronautics)
Languages : en
Pages : 28
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Book Description
This paper discusses short-time creep-rupture life properties of four preloaded titanium alloys under rapid heating conditions. The specimens were resistantly heated, and some comparisons were made with radiantly heated specimens.
Author: Qiang Li
Publisher:
ISBN:
Category :
Languages : en
Pages : 316
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Author: Thomas R. Cass
Publisher:
ISBN:
Category :
Languages : en
Pages : 76
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Book Description
The report is a summary of research on the growth, perfection and slip processes in pure titanium and titanium-aluminum single phase alloys. A technique was developed for the growth of titanium and dilute titanium alloy single crystals using an electron-beam zone refiner. A dislocation etchant was discovered, allowing the perfection of these crystals of 10 to the minus 9th power/sq cm. However, annealing the crystals just below the transformation temperature for long times lowers the dislocation density by two to three orders of magnitude. Compression specimens were spark-erosion machined from single crystals, annealed and mecahnically tested. A c-axis compression specimen of high purity titanium deformed by twinning. However, high interstitial content and dilute aluminum alloys both deformed by c+a glide when the load axis was near (0001). This additional deformed system accounts for the polycrystalline ductility of alpha-titanium alloys. An analysis of plastic deformation modes in TiAl was also made. Results on polycrystalline TiAl were in agreement with these predictions. However, single crystals could not be grown for definitive verification of the hypothesized modes. (Author).
