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Thermodynamic modelling of the Hf–Pt system

  • Bo Yang , Cuiping Guo , Changrong Li and Zhenmin Du
Published/Copyright: August 30, 2018
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 109 Issue 9

Abstract

By means of the CALPHAD (CAlcultion of PHAse Diagram) technique, the Hf–Pt system was critically assessed. Based on the experimental data, the four solution phases (liquid, fcc, bcc and hcp) were described with the substitutional solution model. The intermetallic compounds Hf3Pt4 and αHfPt were treated as the formula (Hf,Pt)m(Hf,Pt)n by a two-sublattice model. Based on the solid solution range, the intermetallic compounds HfPt4 and Hf2Pt were treated as the formula (Hf,Pt)1(Pt)3 and (Hf)2(Hf,Pt)1, respectively. The intermetallic compound Hf2Pt3 was treated as a stoichiometric compound. The formulas (Hf,Pt)0.5(Hf,Pt)0.5 · (Va)3 and (Hf,Pt)0.25(Hf,Pt)0.75(Va)0.5 were applied to describe the compounds βHfPt with CsCl-type structure (B2) and HfPt3 with Ni3Ti-type structure (D024) to cope with the order-disorder transition from bcc-A2 to bcc-B2 and hcp-A3 to hcp-D024. A set of self-consistent thermodynamic parameters of the Hf–Pt system was obtained.

Keywords: Hf–Pt system; CALPHAD technique; Order-disorder transition; Thermodynamic modelling
*Correspondence address, Prof. Zhenmin Du, Department of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China, Tel./Fax: +86-10-62333772, E-mail:

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Received: 2017-12-28
Accepted: 2018-04-05
Published Online: 2018-08-30
Published in Print: 2018-09-14

© 2018, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111676
Keywords for this article
Hf–Pt system; CALPHAD technique; Order-disorder transition; Thermodynamic modelling

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Effect of lubricant additives on the tribological behavior of aluminum alloy against steel
  5. First evidence of grain boundary serration in a specifically heat treated wrought Alloy 625 Ni-based superalloy
  6. Precipitation characteristics of a nickel-based single-crystal superalloy after long-term thermal exposure
  7. Dynamic evolution of the metastable structure and nano-precipitation of 7055 aluminum alloy under thermal deformation
  8. Microstructural evolution and high-temperature compressive properties of an extruded Mg–Dy–Zn alloy sheet
  9. Microstructural characterization and residual stress distribution in a nanostructured austenitic stainless steel
  10. Microstructural evolution, phase selection and properties of CoCrCuFeMnxNi high-entropy alloys
  11. Thermodynamic modelling of the Hf–Pt system
  12. Mechanical, tribological and oxidation resistance properties of Ni-based self-lubricating composite coatings at elevated temperature by APS
  13. Pore formation mechanism of porous Ni–Cr–Al alloys prepared by elemental powder reactive synthesis
  14. Co3O4/carbon nano-onions composite as supercapacitor electrode and its excellent electrochemical performance
  15. Short Communications
  16. Reduced graphene oxide–SnO nanocomposites with good visible-light photoactivity
  17. DGM News
  18. DGM News
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