An analysis of the microstructure of spark plasma sintered and hot isostatically pressed V 4Cr 4Ti 1.8 Y 0.4 Ti 3 SiC 2 alloy and its thermal stability

An analysis of the microstructure of spark plasma sintered and hot isostatically pressed V 4Cr 4Ti 1.8 Y 0.4 Ti 3 SiC 2 alloy and its thermal stability

An analysis of the microstructure of spark plasma sintered and hot isostatically pressed V 4Cr 4Ti 1.8 Y 0.4 Ti 3 SiC 2 alloy and its thermal stability 150 150 Mathew
CCFE-PR(16)33

An analysis of the microstructure of spark plasma sintered and hot isostatically pressed V 4Cr 4Ti 1.8 Y 0.4 Ti 3 SiC 2 alloy and its thermal stability

The microstructure and thermal stability of V-4Cr-4Ti-1.8Y-0.4Ti3SiC2 alloy, fabricated by 60 hr mechanical milling of blended powders followed by spark plasma sintering (SPS) and hot isostatic pressing, has been investigated. Analysis was undertaken using orientation image maps obtained from the electron backscattering and transmission Kikuchi diffraction techniques as well as hardness testing. The as-processed microstructure contained a multimodal distribution of grain sizes, in pancaked bands perpendicular to the compression axis of the SPS. This multimodal matrix grain structure exhibited regions of both random and clear <111> fibre texture with grain boundary disorientations that are virtually all high angle (>15°). Both the pancaking and texture observations are most likely a result of the long hold time of 2 hours during SPS. Post processing heat treatment showed the microstructure remained stable up to 1000°C and significant grain growth was not observed until 1200°C, suggesting this material has much potential for operation in ultra-extreme environments such as a fusion reactor.

Collection:
Journals
Journal:
Journal of Alloys and Compounds
Publisher:
Elsevier
Published date:
04/01/2016