Effects of decomposition route and microstructure on h-AlN formation rate in TiCrAlN alloys

JOURNAL OF ALLOYS AND COMPOUNDS

卷:691

Article

Chen, Y. H.¹  Rongstrom, L.¹  Ostach, D.²  Ghafoor, N.¹  Johansson-Joesaar, M. P.^1,3  Schell, N.²  Birch, J.⁴  Oden, M.¹ 

[1] Linkoping Univ, Dept Phys Chem & Biol IFM, Nanostruct Mat, SE-58183 Linkoping, Sweden

[2] HZG, Max Planck Str 1, D-21502 Geesthacht, Germany

[3] SECO Tools AB, R&D Mat & Technol Dev, SE-73782 Fagersta, Sweden

[4] Linkoping Univ, Dept Phys Chem & Biol IFM, Thin Film Phys, SE-58183 Linkoping, Sweden

关键词: Coating materials;    Phase transitions;    Kinetics;    Synchrotron radiation;   

DOI  :  10.1016/j.jallcom.2016.08.299

来源: Elsevier

【 摘 要 】

The phase evolution of cubic (c), solid solution TixCr-0.37Al1-0.37-x N alloys with x = 0.03 and 0.16, and the kinetics of the hexagonal (h)-AlN formation are studied via in situ wide angle x-ray scattering experiments during high temperature (1000-1150 degrees C) annealing. Spinodal decomposition was observed in Ti0.16Cr0.36Al0.48N while Ti0.03Cr0.38Al0.59N decomposes through nucleation and growth of h-AlN, c-TiN and c-CrAlN. h-AlN is formed from c-CrAlN domains in both cases and the formation rate of h-AlN depends on the stability of the c-CrAlN domains. In Ti0.16Cr0.36Al0.48N, the c-CrAlN domains are stabilized by crystallographic coherency with the surrounding c-TiCrN in a microstructure originating from spinodal decomposition. This results in lower formation rates of h-AlN for this composition. These differences are reflected in higher activation energy for h-AlN formation in Ti0.16Cr0.36Al0.48N compared to Ti0.03Cr0.38Al0.59N. It also points out different stabilities of the intermediate phase c-CrAlN during phase decomposition of TiCrAlN alloys. Additional contributions to the low activation energy for formation of h-AlN in Ti0.03Cr0.38Al0.59N stems from precipitation at grain boundaries. (C) 2016 Elsevier B.V. All rights reserved.

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