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SUMMARY:IMX Colloquium - Materials Degradation When Fuelling a Tokamak
DTSTART:20251201T131500
DTEND:20251201T141500
DTSTAMP:20260921T204401Z
UID:59e4f292ec6a838df3293ac35d780ed0bb3878de0195cebbdd7da3b5
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. David Armstrong\, University of Oxford\, UK\nFor any com
 mercial Fusion device to operate it will require a source of tritium to be
  bred within the device using the neutrons generated in the D-T reaction. 
 This can only be done through the neutron capture of a neutron by a lithiu
 m-6 nucleus. Different power plant concepts are looking to have the lithiu
 m held in different forms\; two of the most common are either liquid lithi
 um or solid lithium ceramics.\nIn this talk I will discuss some of the mat
 erial science and engineering challenges associated with tritium breeding.
  This will start with the corrosion of structural materials by liquid lith
 ium and show that steels in particular are highly susceptible to lithium c
 orrosion even at moderate temperatures with significant dissolution of car
 bide and grain boundaries. Alterative refractory metals and ceramics will 
 then be discussed and some issues that arise in system often described as 
 immune to lithium corrosion.\nI will then move to look at the possibility 
 of looking at novel ceramic materials for tritium breeding\, focusing on m
 aterials with higher lithium atomic fractions than conventionally proposed
 . This will include effect of radiation damage on the octo-lithium (Li8XO6
 ) compounds (where X=Sn\,Zr\,Pb or Ce) and solid state interactions betwee
 n Li2O and proposed structural materials showing that there are many commo
 n issues in materials degradation between solid and liquid breeder materia
 ls. \n\nBio: My first degree was in Materials Science at St Anne’s Col
 lege\, Oxford. This was followed by a DPhil at Corpus Christi\, Oxford dev
 eloping novel methods for measuring micromechanical properties in copper a
 nd nickel alloys. \nIn 2009 I was awarded the Culham Centre for Fusion En
 ergy Junior Research fellowship at St Edmund Hall. This fellowship allowed
  me to apply micromechanical testing methods developed in my doctoral stud
 ies to materials for fusion power – in particular irradiated tungsten al
 loys where I showed that implantation of helium can significantly alter me
 chanical behaviour of tungsten. In 2013 I was awarded a 5-year Royal Acade
 my of Engineering Research Fellowship titled “Micro-engineering advance
 d alloys for extreme nuclear power environments”. This was focused on d
 eveloping methods of measuring mechanical behaviour of materials at the na
 noscale at temperatures up to 1300 K. In 2015 I was awarded the Institute 
 of Materials Minerals and Mining Grunfeld Memorial Award & Medal\, for a p
 rofessional contribution that has had significant influence on engineering
  applications in the metallurgical industries and in 2022 I was awarded th
 e title of Professor of Materials Science and Engineering. 
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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