Hits:

Indexed by:期刊论文

Date of Publication:2011-11-25

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

Included Journals:Scopus、SCIE、EI

Volume:529

Issue:1

Page Number:113-118

ISSN No.:0921-5093

Key Words:Mechanical characterization; Ceramics; Nickel based superalloys; Composites; Fracture

Abstract:Two NiCoCrAl/YSZ laminate composites (A and B) with different metal-layer thickness (approximate to 35 mu m and 14 mu m, respectively) were fabricated by electron beam physical vapor deposition (EB-PVD). Their microstructure was examined and their mechanical properties were compared with the 289 mu m thick NiCoCrAl monolithic foil produced by EB-PVD. Both the YSZ and NiCoCrAl layers of the laminate composites had columnar grain structure. But the periodic layer interfaces limited the columnar grain size. Some pores between the columns were also observed. It was found that the strength of the laminate A was equal approximately to that of the NiCoCrAl monolithic foil, and that laminate B had the greater strength. Moreover, the density of the foils decreased with the increasing thickness ratio of YSZ/NiCoCrAl layers and the increasing the layer number. Thus, comparing with the NiCoCrAl monolithic foil, the NiCoCrAl/YSZ laminate composites not only had the equal or greater strength, but also had the much greater specific strength. (C) 2011 Elsevier B.V. All rights reserved.