Microstructure-strength relationship of a deformation processed aluminum-titanium composite

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Description

The mechanical properties, electrical properties and microstructures have been evaluated for an Al-20 wt % Ti deformation processed metal metal matrix composite (DMMC). The strength of the swaged, extruded and wire drawn composite increases several-fold with increasing deformation up to a true strain of 12.1, the maximum investigated. At this point the Ti was elongated and SEM and TEM analysis of the transverse direction of the wire showed the ribbon-like filaments that are common for this type of material. Texture development was also characterized to explain the deformation characteristics of the composite materials. The Ti filaments acquired a <10{bar 1}0> ... continued below

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73 p.

Creation Information

Lund, T. February 23, 1998.

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  • Ames Laboratory
    Publisher Info: Ames Lab., IA (United States)
    Place of Publication: Iowa

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Description

The mechanical properties, electrical properties and microstructures have been evaluated for an Al-20 wt % Ti deformation processed metal metal matrix composite (DMMC). The strength of the swaged, extruded and wire drawn composite increases several-fold with increasing deformation up to a true strain of 12.1, the maximum investigated. At this point the Ti was elongated and SEM and TEM analysis of the transverse direction of the wire showed the ribbon-like filaments that are common for this type of material. Texture development was also characterized to explain the deformation characteristics of the composite materials. The Ti filaments acquired a <10{bar 1}0> fiber texture during deformation, and the Al filaments acquired a dual texture of (111) and (100). Resistivity measurements of the composite showed that for the highest deformed sample ({eta} = 12.1), the resistivity increased linearly with temperature up to the temperature where Al{sub 3}Ti formed. At this point the slope increased. Beyond this point, the resistivity of the sample never returned to its original value. The temperature where Al{sub 3}Ti forms was investigated using DTA and XRD analysis. The reaction temperature decreases with increasing deformation true strain ({eta}) and filament spacing.

Physical Description

73 p.

Notes

OSTI as DE98004616

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  • Other Information: DN: Thesis submitted to Iowa State Univ., Ames, IA (US); TH: Thesis (M.S.)

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  • Other: DE98004616
  • Report No.: IS-T--1838
  • Grant Number: W-7405-ENG-82
  • DOI: 10.2172/658375 | External Link
  • Office of Scientific & Technical Information Report Number: 658375
  • Archival Resource Key: ark:/67531/metadc711985

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  • February 23, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 6, 2015, 9:03 p.m.

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Lund, T. Microstructure-strength relationship of a deformation processed aluminum-titanium composite, report, February 23, 1998; Iowa. (digital.library.unt.edu/ark:/67531/metadc711985/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.