Creep of a fine-grained, fully-lamellar, two-phase TiAl alloy at 760{degree}C

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Creep of a TiAl alloy, having a composition of Ti-47Al-2Cr-2Nb (in atom %) and a fine-grained, fully-lamellar structure, was carried out at 760 C and stresses between 69--723 MPa. It was found that, in addition to having good room temperature properties, the alloy exhibits higher creep resistance than other TiAl alloys with a similar composition. Both the creep data and microstructures of the alloy suggest that there exists a change in deformation mechanism from a glide-controlled process at high stresses to a recovery-controlled process at low stresses. Also, microstructural evidence indicates that the rate-controlling recovery mechanism is the climb of ... continued below

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9 p.

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Wang, J.N.; Schwartz, A.J.; Nieh, T.G.; Liu, C.T.; Sikka, V.K. & Clemens, D. February 1, 1995.

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Description

Creep of a TiAl alloy, having a composition of Ti-47Al-2Cr-2Nb (in atom %) and a fine-grained, fully-lamellar structure, was carried out at 760 C and stresses between 69--723 MPa. It was found that, in addition to having good room temperature properties, the alloy exhibits higher creep resistance than other TiAl alloys with a similar composition. Both the creep data and microstructures of the alloy suggest that there exists a change in deformation mechanism from a glide-controlled process at high stresses to a recovery-controlled process at low stresses. Also, microstructural evidence indicates that the rate-controlling recovery mechanism is the climb of dislocation segments pinned by ledges at {gamma}/{alpha}{sub 2} interfacial boundaries.

Physical Description

9 p.

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OSTI as DE95009531

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  • Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Las Vegas, NV (United States), 12-16 Feb 1995

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  • Other: DE95009531
  • Report No.: UCRL-JC--119681
  • Report No.: CONF-950201--11
  • Grant Number: W-7405-ENG-48;AC05-84OR21400
  • DOI: 10.2172/46701 | External Link
  • Office of Scientific & Technical Information Report Number: 46701
  • Archival Resource Key: ark:/67531/metadc676063

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 1, 1995

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  • July 25, 2015, 2:21 a.m.

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  • May 31, 2016, 6:17 p.m.

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Wang, J.N.; Schwartz, A.J.; Nieh, T.G.; Liu, C.T.; Sikka, V.K. & Clemens, D. Creep of a fine-grained, fully-lamellar, two-phase TiAl alloy at 760{degree}C, report, February 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc676063/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.