Interaction between Ti-6%Al-4%V Alloys and Hardmetals Coated by Cathodic-Arc Technology

C.M. Moreno; G. Artola; J.M. Sanchez

doi:10.4028/www.scientific.net/MSF.492-493.353

Paper Titles

The Synthesis of Indium Tin Oxide Nano – Powders by Solvothermal Process
p.331

Indentation of AlN/CrN Multilayers from Room Temperature to 400 °C
p.335

Fabrication of Nanostructure Composites in Functionally Graded Coatings with Supersonic Free-Jet PVD
p.341

Functionally Graded Coatings of Carbon Reinforced Carbon by Physical and Chemical Vapour Deposition (PVD and CVD)
p.347

Interaction between Ti-6%Al-4%V Alloys and Hardmetals Coated by Cathodic-Arc Technology
p.353

New Multifunctional FGM Coatings Produced Using ESA and TRESS Methods
p.359

A Simple Galerkin Boundary Element Method for Three-Dimensional Crack Problems in Functionally Graded Materials
p.367

Three Dimensional Fracture Analysis of FGM Coatings
p.373

Time-Dependent Behavior and Fracture of Functionally Graded Thermal Barrier Coatings under Thermal Shock
p.379

HomeMaterials Science ForumMaterials Science Forum Vols. 492-493Interaction between Ti-6%Al-4%V Alloys and...

Interaction between Ti-6%Al-4%V Alloys and Hardmetals Coated by Cathodic-Arc Technology

Abstract:

At present, milling of titanium based alloys for aerospace applications is mainly carried out with un-coated WC-Co carbide tools. The present work evaluates the chemical interaction of the Ti-6%Al-4%V alloy with these WC-Co commercial hardmetals. Strong decarburation induced by carbon diffusion to the Ti based alloy is observed at temperatures ranging from 750-1000°C. This reaction is responsible for the high adhesion found at the alloy-carbide interface. Different cathodic arc coatings have proved efficient in inhibiting such reaction and the associated adhesion to the Ti-6%Al-4%V alloy. Delamination induced by reaction between the Ti6Al4V alloy and AlTiN and TiAlCN coatings increases with the hot pressing temperature, being more severe for the AlTiN material. A lower bound of 44 J/m2 has been obtained for the interfacial fracture energy of cathodic arc PVD TiAlCN coatings on hardmetal substrates, this value being significantly higher than those previously reported for TiAlN materials.