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SUMMARY:Unravelling the Mechanics of MAX Phases: Investigating Deformation
  and Failure Mechanisms in Single and Polycrystalline Structures - Profess
 or Miladin Radovic\, Texas A&M University
DTSTART:20240517T130000Z
DTEND:20240517T140000Z
UID:TALK215428@talks.cam.ac.uk
CONTACT:46601
DESCRIPTION:In the last two decades\, a new class of ceramics has emerged 
 that has challenged their typical description as materials that are hard\,
  difficult to machine\, and susceptible to damage and thermal shock. This 
 class of 160+ members - known as the MAX phases – share common unique ch
 emical formula Mn+1AXn\, (where n = 1\, 2 or 3\, M is and early transition
  metal\, A is an mostly group 13-16 elements\, and X is either C or N) and
  naonolayered crystal structure in which strongly bonded MX layers are int
 erleaved by weakly bonded A layers. The main reason for growing interest i
 n MAX phases lies in their unusual mechanical properties in general\, and 
 high damage tolerance in particular. In general\, MAX phases are elastical
 ly stiff\, good thermal and electrical conductors\, resistant to chemical 
 attack\, and have relatively low thermal expansion coefficients\, but also
  relatively soft and most readily machinable\, thermal shock resistant and
  damage tolerant. Moreover\, some of them – notably Ti2AlC and Ti3SiC2 -
  are fatigue\, creep\, and oxidation resistant. Therefore\, MAX phases are
  considered to be a good candidate materials\, especially for high tempera
 ture structural applications in extreme environments. This seminar lecture
  provides an overview of the current understanding of mechanical behavior 
 of MAX phases\, with the special focused on their deformation by kinking t
 hat can be traced back to their naolaminated crystal structure. Deformatio
 n and failure mechanisms below and above brittle to plastic transition tem
 perature in MAX phases are reviewed\, as well as effect of microstructure 
 (i.e. grain size and secondary phases) on the observed mechanical behavior
  of polycrystalline MAX phases. Furthermore\, anisotropic deformation and 
 failure mechanisms in MAX single crystals\, micropillars and cantilevers i
 s discussed in more details. Possibilities for further improvements in mec
 hanical properties of MAX phases by tailoring their composition and micros
 tructure are also briefly discussed in this presentation.
LOCATION:Oatley 1 Meeting Room\, Department of Engineering
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