Deformation twinning of non-stoichiometric Ti{sub 3}Al alloy

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Non-stoichiometric Ti{sub 3}Al polycrystals with DO{sub 19} structure have been deformed in compression to a true strain of about 8% at temperatures ranging from 973 K to 1,373 K and at an initial strain rate of 1.3 x 10{sup {minus}4}/s. Deformation modes are observed focusing on twinning. It is found that deformation twinning of non-stoichiometric Ti{sub 3}Al occurs in the temperature range of 1,073 K to 1,373 K. Crystallographic characteristics of deformation twinning systems are revealed by optical and transmission electron microscopy and X-ray Laue method. it is shown that most deformation twins are macroscopically lens-shaped and their width is ... continued below

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6 p.

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Lee, J.W.; Hanada, S. & Yoo, M.H. December 31, 1995.

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  • Lee, J.W.
  • Hanada, S. Tohoku Univ., Sendai (Japan). Inst. for Materials Research
  • Yoo, M.H. Oak Ridge National Lab., TN (United States). Metal and Ceramics Div.

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Description

Non-stoichiometric Ti{sub 3}Al polycrystals with DO{sub 19} structure have been deformed in compression to a true strain of about 8% at temperatures ranging from 973 K to 1,373 K and at an initial strain rate of 1.3 x 10{sup {minus}4}/s. Deformation modes are observed focusing on twinning. It is found that deformation twinning of non-stoichiometric Ti{sub 3}Al occurs in the temperature range of 1,073 K to 1,373 K. Crystallographic characteristics of deformation twinning systems are revealed by optical and transmission electron microscopy and X-ray Laue method. it is shown that most deformation twins are macroscopically lens-shaped and their width is increased with increasing temperature. Also, the volume fraction of deformation twins is increased with increasing strain at 1,273 K and temperature in the range of 1,073 K to 1,273 K. A dominant deformation twinning system observed in the samples deformed at temperatures from 1,073 K to 1,373 K is identified as (11{bar 2}2)[11{bar 2}{bar 3}]. {l_brace}11{bar 2}4{r_brace} and {l_brace}10{bar 1}1{r_brace} twins are also operative with a low density.

Physical Description

6 p.

Notes

OSTI as DE96005648

Source

  • 2. Pacific Rim international conference on advanced materials and processing (PRICM-2), Kyongju (Korea, Republic of), 18-22 Jun 1995

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  • Other: DE96005648
  • Report No.: CONF-9506209--2
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/201768 | External Link
  • Office of Scientific & Technical Information Report Number: 201768
  • Archival Resource Key: ark:/67531/metadc669241

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Creation Date

  • December 31, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Jan. 19, 2016, 12:37 p.m.

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Lee, J.W.; Hanada, S. & Yoo, M.H. Deformation twinning of non-stoichiometric Ti{sub 3}Al alloy, report, December 31, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc669241/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.