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Effect of Interphase Boundary Character on Mechanical Properties in NiAl(β) Bicrystals with Ni 3Al(γ') Precipitates along Grain Boundary

Published online by Cambridge University Press:  11 February 2011

Toshiya Sakata ,
Hiroyuki Y. Yasuda  and
Yukichi Umakoshi
Toshiya Sakata
Affiliation:
Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, 2–1, Yamada-Oka, Suita, Osaka 565–0871, Japan
Hiroyuki Y. Yasuda
Affiliation:
Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, 2–1, Yamada-Oka, Suita, Osaka 565–0871, Japan Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, 7–1, Mihogaoka, Ibaraki, Osaka 567–0047, Japan Frontier Research Center, Graduate School of Engineering, Osaka University, 2–1, Yamada-Oka, Suita, Osaka 565–0871, Japan
Yukichi Umakoshi
Affiliation:
Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, 2–1, Yamada-Oka, Suita, Osaka 565–0871, Japan Frontier Research Center, Graduate School of Engineering, Osaka University, 2–1, Yamada-Oka, Suita, Osaka 565–0871, Japan
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Abstract

Role of the crystallography of Ni 3Al(γ') precipitates along grain boundaries of NiAl(β) in the mechanical properties was systematically investigated using β bicrystals with controlled orientations. γ' phase preferentially precipitated along βgrain boundaries showing a film-like shape. The selected variant of γ'-film satisfied the Kurdjumov-Sachs (K-S) relation with a neighboring βcrystal but it deviated from the relation with another adjacent βcrystal. In the course of tensile deformation at room temperature, fracture occurred preferentially at incoherent (β/γ') interphase boundary deviating from the K-S relation and the fracture stress decreased with increasing deviation angle. In contrast, the interphase boundary sliding occurred preferentially at irrational (β/γ') interface at 1073K. The sliding displacement increased with increasing deviation angle. Thus, the mechanical properties of β bicrystals with γ'-film were found to depend strongly on the interphase boundary character.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB5.19
Copyright
Copyright © Materials Research Society 2003

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