期刊
SCRIPTA MATERIALIA
卷 59, 期 9, 页码 991-994出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2008.07.004
关键词
Dynamic strain aging; Nickel alloys; High temperature deformation; Serrations; Precipitation
Serrated flow in a nickel-base superalloy was investigated in three microstructural conditions from room temperature to 973 K by tensile loading at strain rate of 6.5 x 10(-5) s(-1). Serrated flow was noticed for all temperatures above 473 K for solution-annealed microstructure, while no serrations were seen for aged microstructures above 823 K. Niobium depletion in the matrix as a result of precipitation was found to be responsible for the absence of serrations above 823 K in aged microstructures. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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