期刊
ACTA MATERIALIA
卷 54, 期 3, 页码 861-870出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2005.10.016
关键词
multi-phase intermetallic alloys; gcp phase; microstructure; mechanical property; L1(2)
The mechanical data of novel alloys based on the pseudo-ternary system Ni3Al-Ni3Ti-Ni3V was assessed. This alloy system exhibits dual multi-phase microstructures and was described in part I of this paper [Acta Mater 2005:53]. The mechanical characterization was performed on as-cast and hot-worked material. The new alloys show extremely high yield stresses with good temperature retention, when compared with conventional nickel-based alloys. Over a broad temperature range fracture preferentially occurred along grain boundaries. The compressive creep test conducted at temperatures between 1150 and 1250 K showed the presence of threshold stress and also extremely low creep rates when compared with the conventional Ni-based superalloys with dispersed oxide particles. The obtained results are promising for the development of a new type of high-temperature structural material. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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