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Property change during fixtured sintering of NiTi memory alloy

Sadrnezhaad, S. K ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. DOI: 10.1080/AMP-200060636
  3. Publisher: 2006
  4. Abstract:
  5. Fixtured sintering of up to 5 hours at 1223 to 1323 K is successfully used to diminish the dimensional change of NiTi memory alloys produced from mixtures of elemental Ni and Ti powders packed and pressed at room temperature under 400, 500, and 600 MPa pressure. The improvements obtained can help near-net-shape technology via powder metallurgy that overcomes the traditional casting problems such as oxygen, nitrogen, hydrogen, and carbon absorption and intermetallic compound precipitation, which lower the workability and the homogeneity of the final alloy. The effects of compaction pressure, sintering time, and sintering temperature on dimensional change, porosity, hardness, and morphology of the produced TiNi intermetallic alloy are investigated. Phase transformation temperatures and mechanical properties of the sintered samples were determined and compared for the influence of compaction pressure and sintering conditions. It was concluded that suitable thermoelastic and superelastic effects are achievable via appropriate selection of fixtured sintering conditions
  6. Keywords:
  7. Compaction ; Dimensional stability ; Hardness ; Intermetallics ; Morphology ; Porosity ; Powder metallurgy ; Precipitation (chemical) ; Sintering ; Titanium alloys ; Homogenous ; Memory ; Nitilon ; Workability ; Nickel alloys
  8. Source: Materials and Manufacturing Processes ; Volume 21, Issue 1 , 2006 , Pages 87-96 ; 10426914 (ISSN)
  9. URL: https://www.tandfonline.com/doi/abs/10.1080/AMP-200060636