Analytical transmission electron microscopy study of grain boundary precipitates in an Fe-Ni-Mn maraging alloy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:438

Article; Proceedings Paper

Nedjad, S. Hossein ; Ahmadabadi, M. Nili ; Mahmudi, R. ; Furuhara, T. ; Maki, T.

关键词: maraging;    grain boundary;    precipitation;    reverted austenite;    NiMn;   

DOI  :  10.1016/j.msea.2006.02.097

来源: Elsevier

【 摘 要 】

Field-emission gun analytical transmission electron microscopy was used to study grain boundary precipitates in Fe-10Ni-7Mn (wt.%) maraging alloy after isothermal aging at 753 K. High spatial resolution energy dispersive X-ray spectroscopy was used for quantitative chemical analysis of the grain boundary precipitates. Precipitation of f.c.t. theta-NiMn intermetallic compound and reversion to f.c.c. austenite were identified at prior austenite grain boundaries after prolonged aging. Selected area electron diffraction patterns (SADPs) showed the L 1(0) type ordering of f.c.t. theta-NiMn precipitates. The f.c.t. theta-NiMn precipitates showed higher Ni and Mn concentrations than reverted f.c.c. austenite. (c) 2006 Elsevier B.V. All rights reserved.

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