Mechanical Properties of the Ternary L12 Compound Co3(Al,W) in Single and Polycrystalline Forms

Haruyuki Inui; Takashi Oohashi; Norihiko L. Okamoto; Kyosuke Kishida; Katsushi Tanaka

doi:10.4028/www.scientific.net/AMR.278.1

Paper Titles

Preface and Organizing Committee

Mechanical Properties of the Ternary L1₂ Compound Co₃(Al,W) in Single and Polycrystalline Forms
p.1

Dislocation Mechanisms during High Temperature Creep Experiments on MC2 Alloy
p.7

Evolution of Raft Structure during Creep Deformation of the Ni-Based Single-Crystal Superalloy TMS-138
p.19

Dislocation Structures in the Gamma Prime-Phase of CMSX-4 and TMS75 after Degradation under Service Conditions
p.25

Dissolution of Fine γ’ Precipitates of MC2 Ni-Based Single-Crystal Superalloy in Creep-Fatigue Regime
p.31

Diffraction Profile, Strain Distribution and Dislocation Densities during Stage II Creep of a Superalloy
p.37

In Situ Investigation with Neutrons on the Evolution of γ ' Precipitates at High Temperatures in a Single Crystal Ni-Base Superalloy
p.42

HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 278Mechanical Properties of the Ternary L12 Compound...

Mechanical Properties of the Ternary L1₂ Compound Co₃(Al,W) in Single and Polycrystalline Forms

Abstract:

The mechanical properties of Co3(Al,W) with the L12 structure have been investigated both in single and polycrystalline forms. The values of all the three independent single-crystal elastic constants and polycrystalline elastic constants of Co3(Al,W) experimentally determined by resonance ultrasound spectroscopy at liquid helium temperature are 15~25% larger than those of Ni3(Al,Ta) but are considerably smaller than those previously calculated. When judged from the values of Poisson’s ratio, Cauchy pressure and ratio of shear modulus to bulk modulus (Gh/Bh), the ductility of Co3(Al,W) is expected to be sufficiently high. In the yield stress-temperature curve, a rapid decrease and an anomalous increase in yield stress is observed in the low and intermediate (1000-1100 K) temperature ranges, respectively. The former is concluded to be due to the solid-solution hardening effect while the latter is attributed to thermally activated cross-slip of APB-coupled a/2<110> superpartial dislocations from octahedral to cube slip planes.

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