caa a22 4500 388019689 CHVBK 20180307124920.0 cr unu---uuuuu 161130e199812 xx s 000 0 eng 10.1557/JMR.1998.0463 doi S088429140004677X pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0463 High-temperature stability of nanocrystalline structure in a TiAl alloy prepared by mechanical alloying and hot isostatic pressing [Elektronische Daten] A fully dense nanocrystalline compact of the Ti-47Al-3Cr (at. %) alloy was produced by mechanical alloying and hot isostatic pressing at 725 °C. Microstructure characteristics and grain growth behavior of this compact were studied after annealing for up to 800 h in the temperature range of 725 to 1200 °C, using analytical transmission electron microscopy techniques. The temperature and time dependencies of the grain sizes and the grain size distributions were determined. The grain growth occurred, with a timeand temperature-invariant single-peak grain size distribution (when normalized by the mean grain size), which was consistent with normal grain growth. The experimentally measured grain growth exponent decreased from 10 to 4.6 when the temperature was increased. The grain growth kinetics was described by a single thermally activated rate process limited by a permanent pinning force on the grain boundaries. The microhardness decreased on annealing and followed the Hall-Petch relationship with the parameters Hυo = 5.8 GPa and KH = 1.6 MPa m0.5. Copyright © Materials Research Society 1998 Senkov O. N. Institute for Materials and Advanced Processes (IMAP), University of Idaho, Moscow, Idaho 83844-3026 Srisukhumbowornchai N. Institute for Materials and Advanced Processes (IMAP), University of Idaho, Moscow, Idaho 83844-3026 Öveçoglu M. L. Istanbul Technical University, Maslak 80626, Istanbul, Turkey Froes F. H. Institute for Materials and Advanced Processes (IMAP), University of Idaho, Moscow, Idaho 83844-3026 Journal of Materials Research Cambridge University Press 13/12(1998-12), 3399-3410 0884-2914 13:12<3399 1998 13 JMR https://doi.org/10.1557/JMR.1998.0463 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0463 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Senkov O. N. Institute for Materials and Advanced Processes (IMAP), University of Idaho, Moscow, Idaho 83844-3026 NATIONALLICENCE 700 1- Srisukhumbowornchai N. Institute for Materials and Advanced Processes (IMAP), University of Idaho, Moscow, Idaho 83844-3026 NATIONALLICENCE 700 1- Öveçoglu M. L. Istanbul Technical University, Maslak 80626, Istanbul, Turkey NATIONALLICENCE 700 1- Froes F. H. Institute for Materials and Advanced Processes (IMAP), University of Idaho, Moscow, Idaho 83844-3026 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/12(1998-12), 3399-3410 0884-2914 13:12<3399 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge