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View Diary: What are you reading? April 24, 2013 (49 comments)

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  •  I am reading a bunch of amazing papers on... (1+ / 0-)
    Recommended by:
    RiveroftheWest

    ...the remarkable material Ti3SiC2.

    I can't believe that for so many years, while reading on refractory compounds - high temperature materials that would be useful in ameliorating the now inevitable climate disaster - that this compound never crossed paths with me.

    The paper I'm reading right now - which thrills me to my core - is Nature Materials, 2, 107-111 (2003)

    A remarkable passage:

    Slip by dislocation motion is the prevalent micro mechanism of plastic deformation in almost all crystalline materials. It is widely recognized that crystalline materials that exhibit a large multiplicity of easy glide slip systems (for example, face-cent red and body-cent red cubic metals) demonstrate significant ductility, and that dislocation activity in these materials is irreversible, that is, it is not possible, in general, to return the material to its initial microstructural state. It is also well known that materials that exhibit limited amounts of slip are generally brittle (for example, ceramics),which hinders their use in a number of engineering applications. Most known crystalline materials fall into one of the two categories described above. We have encountered a class of materials that exhibit extensive slip, but on a limited number of easy glide slip systems. This new class of layered ternary compounds, with a general formula ofMn+1AXn (where = 1 to 3,M is an early transition metal, A is an A-group element, and X is C and/or N) is now referred to as MAX phases in the literature1–4.There are roughly 50 M2AX phases2; three M3AX2 (Ti3SiC2, Ti3GeC2 andTi3AlC2 (ref. 3)) and one M4AX3,Ti4AlN3 (ref. 4). In previous work 1,5–16,we have reported on the exceptional thermal shock resistance and damage tolerance shown by these materials. In this paper, we report unique characteristics of the mechanical response of Ti3SiC2—perhaps the most significant ones observed to date in this interesting class of materials—in simple compression cyclic tests conducted at room and at higher temperatures.
    OK, so I'm a dork.

    Someone has to do it.

    This material is unbelievably cool, or hot, or something, though, but I guess you had to be there.

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