Startseite Effects of homogenizing and aging treatments on the microstructure and microhardness of an Nb-silicide based ultrahigh temperature alloy
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Effects of homogenizing and aging treatments on the microstructure and microhardness of an Nb-silicide based ultrahigh temperature alloy

  • Haisheng Guo und Xiping Guo
Veröffentlicht/Copyright: 18. Mai 2013
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 101 Heft 7

Abstract

To investigate the effects of homogenizing and aging treatments on the microstructure and microhardness of an Nb-silicide based ultrahigh temperature alloy, coupons were homogenized at 1 300–1 600°C for 50 h, and then aged at 1 100°C for 50 h. The results show that the phase constituents of the heat-treated alloys are still Nb solid solution and silicides, α-(Nb,X)5Si3 phase forms after heat-treatments at temperatures above 1 500°C. With the increase in heat-treatment temperature, the original big polygonal and plate-like silicides gradually break into small ones, and the amounts of retained typical lamellar and rod-like eutectic colonies reduce clearly. The variation of partitioning ratios of alloying elements between Nb solid solution and silicides causes the change in microhardness of the alloy. 1 500°C/50 h + 1 100°C/50 h is an optimum heat-treatment process.

Keywords: Homogenizing treatment; Aging treatment; Nb-silicide based ultrahigh temperature alloy; Microstructural evolution; Microhardness
∗ Prof. Xiping Guo, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Youyixi Road 127, Xi'an 710072, P. R. China, Tel.: +86 29 8849 4873, Fax: +86 29 8849 4873, E-mail:

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Received: 2009-12-17
Accepted: 2010-1-8
Published Online: 2013-05-18
Published in Print: 2010-07-01

© 2010, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110352
Schlagwörter für diesen Artikel
Homogenizing treatment; Aging treatment; Nb-silicide based ultrahigh temperature alloy; Microstructural evolution; Microhardness

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Basic
  4. Thermodynamic modeling of the Pt–Zr system
  5. Experimental investigation and thermodynamic prediction of the Ga–Sb–Sn phase equilibria
  6. Calculation of the viscosity of the liquid ternary Ag–Au–Sn system
  7. Thermophysical properties of liquid tin–bismuth alloys
  8. A comparative AFM study of carbon alloyed Mo–Se–C and W–S–C films for tribological applications
  9. Luminescence of Fe-substituted ZnWO4 powders synthesized by aqueous solution reaction
  10. Electromagnetic radiation during plastic deformation under unrestricted quasi-static compression in metals and alloys
  11. Applied
  12. Microstructure and mechanical properties of Fe3Al–TiC composites
  13. Study of wear behaviour of ductile iron subjected to two step austempering
  14. Effect of annealing on formability and crystallographic textures of aluminium 5052 alloy sheets
  15. The use of fly ash and basaltic pumice as additives in the productionof clay fired brick in Turkey
  16. Insulation properties of bricks made with cotton and textile ash wastes
  17. Effects of homogenizing and aging treatments on the microstructure and microhardness of an Nb-silicide based ultrahigh temperature alloy
  18. Alloys with thermal expansion matching to electrolyte materials for solid oxide fuel cells
  19. Simulation-based study of the compensation coil method applied to ferrite nanometric powders
  20. DGM News
  21. Zum 75. Geburtstag von Prof. Dr.-Ing. habil. Peter Klimanek
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