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

[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.

[发布日期] 2006-12-25

[效力级别]  Proceedings Paper

[关键词] maraging;grain boundary;precipitation;reverted austenite;NiMn