| Dislocations in Extruded Co-49.3 at.% Al |
JUN 86 |
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| Authors:
D. L. Yaney; A. R. Pelton; W. D. Nix
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 | Polycrystalline Co-49.3 at.% Al which had been extruded at 1505 K was examined using transmission electron microscopy. Diffraction contrast analysis showed that b = as well as b = dislocations contribute to elevated temperature deformation in CoAl. Therefore, it was concluded that sufficient slip systems exist in CoAl to allow for general plasticity in the absence of diffusional mechanisms. |
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| Superplastic Properties of an Al-Cu-Li-Zr Alloy |
JUN 85 |
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| Authors:
J. Wadsworth; C. A. Henshall; A. R. Pelton; B. Ward
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| In the present paper, results are presented on the superplastic properties of an Al-Li alloy having a different composition than those previously examined, i.e. an Al-4Cu-2Li-0.15Zr alloy manufactured by ingot metallurgy. The alloy was a slab of thickness 50 mm supplied in a hot rolled condition. The alloy was processed to have a fine grain size. The principal procedure involved four steps: solution heat treatment at 538 C, 0.5 h, ... |
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| Superplastic Behavior of a Powder-Source Aluminum-Lithium Based Alloy |
APR 84 |
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| Authors:
J. Wadsworth; A. R. Pelton
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| In the present study the high-temperature deformation characteristics have been determined for Al-Li based alloys prepared by Rapid Solidification Processing (RSP). The deformation behavior is described both for material in the consolidated condition and for material that has been subsequently thermomechanically processed. Tests were performed on both the Al-3Cu-2Li-1Mg-0. 2Zr and Al-2.5Li-1.5Cu-1Mg-0.1Zr alloys in the extruded condition. Strain rate change tests were performed at 400, 450 and 500 C for ... |
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| An Investigation of the Influence of Shock-Wave Profile on the Mechanical and Thermal Responses of Polycrystalline Iron. |
30 SEP 1978 |
145 pages |
| Authors:
G. A. Stone; G. T. Gray; A. R. Pelton; R. N. Orava; SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY RAPID CITY DIV OF ENGINEERING
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 | An investigation was conducted to determine the relative influence of shock-wave parameters on the strengthening of Magnetic Ingot Iron and AISI 1008 Steel. The independently-varied shock-wave parameters include peak pressure, peak pressure duration, and rarefaction rate. Eighteen shock-loading conditions were studied with peak pressures of 8, 10, 13, 18, 25 and 35 GPa. As peak pressure was increased, an increase of the 0.2% off-set yield stress, hardness, twin density and ... |
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