W0.5TaTiVCr-based composite reinforced with W-mesh for Fusion Plasma-Facing Applications
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20ja109_full.pdf
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Author(s)
Waseem, Owais Ahmed
Ryu, Ho Jin
Date Issued
March 2020
Journal
Functional Composites and Structures
Publisher
IOP
Abstract
We present research into tungsten (W) alloy-based composites reinforced with W-mesh. Due to low activation and higher strength properties, W0.5TaTiVCr was used as a matrix material. Layers of W-mesh (Wmesh) were embedded in W0.5TaTiVCr for improving ductility and toughness. We employed elemental powder mixing and spark plasma sintering (SPS) at 1600 °C for sample preparation, which is a simpler method as compared to chemical vapor infiltration and hot isostatic pressing. The microstructural analysis shows W-mesh that is well-bonded with the W0.5TaTiVCr matrix, which exhibits multiple phases and BCC structure. The room temperature compressive fracture strain of W0.5TaTiVCr/Wmesh composites show an improvement from ~3.5% to ~15.8% due to increase in Wmesh concentration from 10 wt% to 50 wt%, whereas the compressive yield strength changes from ~1900 MPa to ~1700 MPa (at room temperature) and ~1200 MPa to ~950 MPa (at 1200 °C). The W0.5TaTiVCr matrix alone shows ~7.7 MPa·m1/2 fracture strain, and the addition of 10 wt%Wmesh in W0.5TaTiVCr results in more than a two-fold increase in fracture toughness (up to ~20 MPa·m1/2), which suggests a potential use of this material in fusion reactors.
Description
Submitted for publication in Functional Composites and Structures
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1088/2631-6331/ab7980
