Microstructures and wear properties of laser cladding Co-based composite coatings on Ti–6Al–4V

Microstructure and wear resistance of laser clad TiB–TiC/TiNi–Ti2Ni intermetallic coating on titanium alloy

In order to improve the surface mechanical performance of Ti-6Al-4V alloy, in-situ TiC-TiB2 composite coating was deposited by tungsten inert gas (TIG) cladding process using Ti and B4C as precursor powder. Based on the available literature, SEM images of the blended precursor powder mixture and coating layer, electron probe micro analysis (EPMA) and corresponding XRD analysis of the produced coating, the formation mechanism of the present TiC-TiB2 composite coating during TIG cladding process was elucidated. The analysis shows that in the coating, TiB2 and TiB phases appeared as hexagonal or rectangular shape, whereas TiC as spherical shape within the matrix of unreacted Ti, Ti-6Al-4V alloy form the substrate and intermetallic phase like TiAl3 formed during the cladding process. The analysis also revealed that the TIG cladding processing current and scan speed have substantial effect on the coating morphology and the phases formed in the coating.

In-situ TiC-TiB2 coating on Ti-6Al-4V alloy by tungsten inert gas (TIG) cladding method: Part-I. Microstructure evolution

Effects of high temperature treatment on microstructure and mechanical properties of laser-clad NiCrBSi/WC coatings on titanium alloy substrate

Synthesis and characterization of in situ TiC–TiB2 composite coatings by reactive plasma spraying on a magnesium alloy

Microstructure and formation mechanism of in-situ TiC-TiB2/Fe composite coating

Porous 2024Al-Al3Zr composites were prepared by in situ and spatial scaffolding methods. As the Al3Zr content increased from 5 wt.% to 30 wt.%, the binding of the powder in the pore wall increased and the defects in the composites decreased. The yield strength of the composites reached 28.11 MPa and the energy absorption capacity was 11.68 MJ/m3 at a Zr content of 20 wt.%, when the composites had the best compression and energy absorption performance. As the space scaffold content increased from 50% to 70%, the porosity of the composites then increased from 53.51% to 70.70%, but the apparent density gradually decreased from 1.46 g/cm3 to 0.92 g/cm3, leading to a gradual decrease in their compressive properties. In addition, by analysing the compression fracture morphology, the increase of Al3Zr will reduce the stress concentration and hinder the crack growth, while too much Al3Zr will lead to brittleness and reduce the performance.

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Xiao-hui Zhou

Papers

Microstructure and formation mechanism of in-situ TiC-TiB2/Fe composite coating

Microstructure and Compressive Properties of Porous 2024Al-Al3Zr Composites