Al-Al3Ti nanocomposite produced in situ by two-step hot-press sintering

Nikfar, B ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1088/1757-899X/40/1/012005
  3. Publisher: 2012
  4. Abstract:
  5. Aluminum reinforced with a large amount (up to about 55 vol.%) of Al 3Ti particles can be fabricated from Al-20Ti elemental nanometer-sized powder mixture via in-situ two step hot press sintering (TSS). For production of intermetallic reinforced in-situ composite, TSS can provide elevated temperature to facilitate the formation of intermetallic phase in situ and hot consolidation to form a fully dense solid. The first step sintering was employed at a higher temperature to obtain an initial high density, and the second step was held at a lower temperature by isothermal sintering for more time than the first one to increase bulk density without significant grain growth. The optimum TSS regime consisted of heating at 625°C for 5 min (1st step) and 570°C for 40 min (2nd step) with applied pressure of 470 MPa, resulting in the formation of near full dense microstructure (0.97 TD) with suppressed grain growth
  6. Keywords:
  7. Applied pressure ; Bulk density ; Elevated temperature ; Full dense ; High density ; Hot-press sintering ; In-situ composite ; Intermetallic phase ; Isothermal sintering ; Large amounts ; Lower temperatures ; Nanometer-sized powder ; Production of ; Ti particles ; Aluminum ; Grain growth ; Nanocomposites ; Presses (machine tools) ; Reinforcement ; Sintering
  8. Source: IOP Conference Series: Materials Science and Engineering ; Volume 40, Issue 1 , 2012 ; 17578981 (ISSN)
  9. URL: http://iopscience.iop.org/article/10.1088/1757-899X/40/1/012005/meta