Microstructure Investigation of the Spark Plasma Sintered Cu—Al—Ni Shape Memory Material

G. E. Monastyrsky$^{1,2}$, A. V. Kotko$^{3}$, A. V. Gilchuk$^{1}$, P. Ochin$^{4}$, V. I. Kolomytsev$^{2}$, Yu. M. Koval’$^{2}$

$^{1}$National Technical University of Ukraine ‘KPI’, 37 Peremohy Ave., 03056 Kyiv, Ukraine
$^{2}$G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03680 Kyiv-142, Ukraine
$^{3}$I.M. Frantsevich Institute for Problems of Materials Sciences, NAS of Ukraine, 3 Academician Krzhizhanovskoho Str., UA-03680 Kyiv-142, Ukraine
$^{4}$Institut de Chimie et des Matériaux Paris Est (ICMPE—CNRS), 2—8 Henri Dunant Rue, 94320 Thiais, France

Received: 28.11.2013; final version - 07.07.2014. Download: PDF

The microstructure of Cu—13.0Al—3.9Ni—0.4Ti—0.2Cr wt.% compacts sintered by spark plasma method from powders prepared by spark-erosion method in liquid argon from master alloy is investigated. Powder is annealed in H$_{2}$ atmosphere before the spark plasma sintering. SEM and TEM investigations reveal that sintered samples have a composite structure, which consists of the micron and submicron spherical metallic particles embedded into the binder matrix. This matrix seems to be the product of copper oxide reduction according to the scheme CuO → Cu$_{4}$O$_{3}$ → Cu$_{2}$O → Cu$_{8}$O and aluminium hydroxides’ conversion according to the flowchart aluminium hydroxide → transition alumina → $\alpha$-Al$_{2}$O$_{3}$, during the annealing and/or sintering. TEM study reveals that main phase in metallic particles is self-accommodated 18R martensite. The regular basal plane stacking faults and/or (001)$_{18R}$ microtwins are dominant defects in 18R martensite. 18R martensite of single orientation occupies entire volume of spherical nanoparticles, being the basal plane stacking faults and/or (001)$_{18R}$ microtwins, which have different thicknesses.

Key words: 18R martensite, basal plane stacking faults, microtwins, Cu–Al–Ni alloys, spark plasma sintering method, spark-erosion method.

URL: http://mfint.imp.kiev.ua/en/abstract/v36/i08/1091.html

DOI: https://doi.org/10.15407/mfint.36.08.1091

PACS: 81.05.Bx, 81.07.Bc, 81.07.Wx, 81.20.Ev, 81.30.Kf, 81.30.Mh

Citation: G. E. Monastyrsky, A. V. Kotko, A. V. Gilchuk, P. Ochin, V. I. Kolomytsev, and Yu. M. Koval’, Microstructure Investigation of the Spark Plasma Sintered Cu—Al—Ni Shape Memory Material, Metallofiz. Noveishie Tekhnol., 36, No. 8: 1091—1099 (2014)

  1. S. Miyazaki, K. Otsuka, H. Sakamoto, and K. Shimizu, Trans. Jpn. Inst. Met., 4: 244 (1981). Crossref
  2. S. Miyazaki and K. Otsuka, Shape Memory. Alloys, Precision Machinery and Robotics (Ed. H. Funakubo) (New York: Gordon and Breach: 1987), vol. 1, p. 116.
  3. S. Miyazaki and K. Otsuka, ISIJ Int., 29: 353 (1989). Crossref
  4. R. A. Portier, P. Ochin, A. Pasko, G. E. Monastyrsky, A. V. Gilchuk, V. I. Kolomytsev, and Yu. N. Koval, J. Alloys Compd., 577, Suppl. 1: S472 (2013). Crossref
  5. J. Carrey, H. B. Radousky, and A. E. Berkowitz, J. Appl. Phys., 95: 823 (2004). Crossref
  6. G. E. Monastyrsky, P. Ochin, A. V. Gilchuk, V. I. Kolomytsev, and Yu. N. Koval, J. Nano- Electron. Phys., 4: 01007-1 (2012).
  7. M. O'Keeffe and J. O. Bovin, American Mineralogist, 63: 180 (1978).
  8. R. Guan, H. Hashimoto, and K. H. Kuo, Acta Cryst., B40: 560 (1984). Crossref
  9. P. S. Santos, H. S. Santos, and S. P. Toledo, Materials Research, 3: 104 (2000). Crossref
  10. L. Smrcok, V. Langer, and J. Krestan, Acta Crystallogr., C62: i83 (2006). Crossref
  11. W. Guse and H. Saalfeld, Neues Jahrbuch für Mineralogie Monatshefte, 5: 217 (1990).
  12. Yo. K. Shi, J. Ceram. Soc. Jpn., 84: 610 (1976).
  13. C. O. Areán and J. S. D. Vi-uela, J. Solid State Chem., 60, Iss. 1: 1 (1985). Crossref
  14. M. Hoch and H. L. Johnston, J. Am. Chem. Soc., 76, No. 10: 2560 (1954). Crossref
  15. Industrial Alumina Chemicals. ACS Monograph 184 (Ed. C. Misra) (Washington, DC: American Chemical Society: 1986), p. 76.
  16. F. Lovey, G. Van Tendeloo, G. Van Landuyt, and S. Amelinckx, Scr. Met., 19, No. 10: 1223 (1985). Crossref
  17. T. Waitz, V. Kazykhanov, and H. P. Karnthaler, Acta Mater., 52: 137 (2004). Crossref
  18. T. Waitz and H. P. Karnthaler, Acta Mater., 52: 5461 (2004). Crossref