Fracture Behavior of Brittle Coating Layer on Metal Substrate

Shojiro Ochiai; T. Tomida; Toyomitsu Nakamura; S. Iwamoto; Hiroshi Okuda; Masashi Tanaka; M. Hojo

doi:10.4028/www.scientific.net/MSF.475-479.929

Paper Titles

Manufacture of Al/SiC Composites by Pressure Infiltration Process
p.913

Rolling and Annealing Textures of SiC_w/Al Composite
p.917

Fabrication of the Aluminum Matrix Composite by Ultrasonic Infiltration Technique
p.921

In Situ Synthesis and Properties of Aluminum Composites with Ultrafine TiB₂ and Al₂O₃ Particulates
p.925

Fracture Behavior of Brittle Coating Layer on Metal Substrate
p.929

Bending Damage Evolution and Its Influence on Critical Current and N-Value of Bi2223/Ag Superconducting Composite Tape
p.933

A Monte Carlo Simulation on the PFZ Microstructures in Al-Based Alloys during Multistep Annealing
p.937

Proposal of Pseudo Crack Model for the Un-Cracking Delamination Behavior of Fiber Reinforced Metal Laminates
p.941

Processing and Microstructures of Tungsten/Copper Composites Produced by Plasma Spray and Cold Spray
p.945

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Fracture Behavior of Brittle Coating Layer on Metal Substrate

Abstract:

The compressive fracture and spalling of multiply-cracked brittle coating layer on metal substrate under tensile stress was studied for the anodic-oxidized aluminum wire with the Al2O3 coating layer and galvannealed IF steel plate with the intermetallic compound coating layer consisting of ζ, δ1 and Γ1 and Γ phases. The thin Al2O3 coating layer on Al wire was fractured by buckling in the circumferential direction by the compressive hoop stress, but thick layer was debonded by the tensile radial stress at interface. The thickness of the coating layer at the transition from the compressive fracture to interfacial debonding was around 30 µm. In the galvannealed steel plate sample, the (ζ+δ1) phases were fractured by buckling in the width direction, resulting spalling of the (ζ+δ1) phases in the first stage, and the remained (δ1+Γ1+ Γ) phases or (Γ1+Γ) phase was again fractured by buckling, followed by the spalling of the remained phase.