Preprint Article Version 2 Preserved in Portico This version is not peer-reviewed

Plasma Facing Material by Self-Interstitial Solid Solution Strengthening – Problem, Proposition, and a Solution

Version 1 : Received: 11 October 2020 / Approved: 12 October 2020 / Online: 12 October 2020 (16:55:14 CEST)
Version 2 : Received: 11 January 2023 / Approved: 11 January 2023 / Online: 11 January 2023 (09:00:32 CET)

How to cite: Rafique, M. M. A. Plasma Facing Material by Self-Interstitial Solid Solution Strengthening – Problem, Proposition, and a Solution. Preprints 2020, 2020100258. https://doi.org/10.20944/preprints202010.0258.v2 Rafique, M. M. A. Plasma Facing Material by Self-Interstitial Solid Solution Strengthening – Problem, Proposition, and a Solution. Preprints 2020, 2020100258. https://doi.org/10.20944/preprints202010.0258.v2

Abstract

Bubble (point defect) – a precursor of fuzz or under dense nanostructure formation is crystal lattice defect. Suitable selection of crystal lattice which inhibit Frenkel pair generation and intrinsically promotes self- interstitial solid solution strengthening contributes effectively towards making plasma facing material. For this, interstitial sites, their size, amount / fraction, positions, tendency of occupation and diffusion parameters (e.g. activation energies (Q), activation volumes) are determined. Fcc iron carbon alloys (austenitic stainless steels AISI / SAE 321, fcc structure, Pearson code cF4, space group Fmm) are proposed as suitable candidates. Along with their room temperature fcc structure having 12 interstitial positions (4 octahedral, 6 coordination sites and 8 tetrahedral, 4 coordination sites / unit cell) to allow insertion of self (iron) atoms, they have excellent corrosion resistance, thermal conductivity, and non- magnetic properties. After their melting, casting, and machining to required dimensions and geometry, stabilizing heat treatment is applied to precipitate all carbon as TiC and prevent formation of Cr23C6 (sensitization). This resist heat and surface degradation and yield excellent architecture which not onlyinhibit Frankel pair generation but will also allow bulk assimilation or surface annihilation (loop punching) of this lattice point defect. A superior thermal, fluid, and structural design augment above. A second choice is presented as Co base superalloys owing to same fcc crystal structure and excellent properties (such as strength, dimensional stability, oxidation resistance) at high temperature.

Keywords

point defect; crystal lattice; interstitial; austenitic; stabilization; superalloys

Subject

Chemistry and Materials Science, Materials Science and Technology

Comments (1)

Comment 1
Received: 11 January 2023
Commenter: Muhammad Musaddique Ali Rafique
Commenter's Conflict of Interests: Author
Comment: Plasma facing material by self-interstitial solid solution strengthening –problem, proposition, and a solution  

Muhammad Musaddique Ali Rafique1,2,3  Massachusetts Institute of Technology, Cambridge, MA 02139Eastern Engineering Solutions Inc., Cambridge, MA 02139National Aeronautics and Space Administration, 39B, Florida 
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