Dislocations and mechanical properties of single crystal niobium disilicide

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The mechanical properties of single crystal NbSi{sub 2} have been investigated along [0001] and 45{degree} from [0001] toward [11{bar 2}0] using a Nikon QM-2 hot hardness tester from room temperature to 900 C in vacuum. The hardness along [0001] increases from room temperature to 300 C followed by a sharp decrease in hardness with temperature which is accompanied by a large uplift observed surrounding the indentations. Dislocations surrounding the indentations at room temperature and 300 C were analyzed using techniques in transmission electron microscopy to find slip by <10{bar 1}0> dislocations at room temperature with a change in the active ... continued below

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9 p.

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Maloy, S.A.; Chu, F.; Petrovic, J.J. & Mitchell, T.E. September 1, 1996.

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Description

The mechanical properties of single crystal NbSi{sub 2} have been investigated along [0001] and 45{degree} from [0001] toward [11{bar 2}0] using a Nikon QM-2 hot hardness tester from room temperature to 900 C in vacuum. The hardness along [0001] increases from room temperature to 300 C followed by a sharp decrease in hardness with temperature which is accompanied by a large uplift observed surrounding the indentations. Dislocations surrounding the indentations at room temperature and 300 C were analyzed using techniques in transmission electron microscopy to find slip by <10{bar 1}0> dislocations at room temperature with a change in the active slip systems at 300 C. The hardness along a direction 45{degree} from [0001] toward [11{bar 2}0] sharply decreases with increasing temperature above room temperature. Coarse slip lines surround the indentations referring to slip on the basal plane.

Physical Description

9 p.

Notes

INIS; OSTI as DE96014235

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  • American Society of Mechanical Engineers (ASME) and Metals materials week, Cincinnati, OH (United States), 6-10 Oct 1996

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  • Other: DE96014235
  • Report No.: LA-UR--96-2426
  • Report No.: CONF-961017--4
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/378865 | External Link
  • Office of Scientific & Technical Information Report Number: 378865
  • Archival Resource Key: ark:/67531/metadc675813

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  • September 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 29, 2016, 8:55 p.m.

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Maloy, S.A.; Chu, F.; Petrovic, J.J. & Mitchell, T.E. Dislocations and mechanical properties of single crystal niobium disilicide, report, September 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc675813/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.