Journal article
A progress report on Ti3SiC2, Ti3GeC2, and the H-phases, M2BX
Journal of materials synthesis and processing, Vol.5(3)
01 May 1997
Abstract
Recently [1,2] we reported on two classes of layered ternary compounds, namely, Ti3SiC2, Ti3GeC2, and Ti3AlC2, henceforth referred to as the 312s, and the H-phases, M2BX, where M is a transition metal, B is a group B element, and X is either C or nitrogen. In both cases, the structure is hexagonal, with alternating transition metal carbide (or nitride) layers interleaved with hexagonal nets of the B-group element. In this paper we expand on our original findings and summarize our understanding of these layered materials to date. As a class these ternaries have relatively low hardness (4-6 GPa) and high electrical conductivities (2-5 x 10(6) Ohm(-1) m(-1)) and are as readily machinable as graphite. At temperatures above 1200 degrees C they deform plastically with yield points that are quite high (>100 MPa at 1300 degrees C) for that temperature. In addition, Ti3SiC2 is not susceptible to thermal shock, has good oxidation resistance (1 x 10(-8) kg(2) m(-4) s(-1) at 1000 degrees C), and is a good thermal conductor (43 W/mK). It is also a damage-tolerant material. At this time there is little doubt that the deformation mechanism in these materials is dominated by slip along the basal planes. An apt descriptor of these materials is "polycrystalline nanolaminates," if it is understood that the lamina are flexible and can shear with ease relative to each other.
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Details
- Title
- A progress report on Ti3SiC2, Ti3GeC2, and the H-phases, M2BX
- Creators
- M W BarsoumT El-Raghy
- Publication Details
- Journal of materials synthesis and processing, Vol.5(3)
- Publisher
- PLENUM PUBL CORP
- Number of pages
- 20
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Identifiers
- 991019170557304721
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