Probing at the Nanoscale the Structure and Properties of Hard Second Phases in Alloys and Composites
Lionel Michelet, Marta Fornabaio and Andreas Mortensen with former contributions from Vaclav Pejchal, Martin Mueller, Aparna Singh, Goran Zagar, Andreas Rossoll, Cyril Dénéréaz, Raphael Charvet
Our ambition in this new project funded by an ERC Advanced Grant is to probe the strength of “second” phases in multiphase metal alloys and composites, meaning of hard particles added to strengthen a metal, or alternatively of brittle inclusions that weaken it. Such phases are ubiquitous in structural metals; yet not much is known of the microstructural features that govern their strength.
The underlying hypothesis of this project is that defects that limit the strength of such hard second phases can be identified and then altered by processing. Operationally, we plan to apply and extend nanomechanical testing to probe the strength of micrometric, irregularly shaped, hard particles currently used to strengthen metals. We aim to test such particles whole, and also for their local internal properties. Testing will rely on focused ion beam machining combined with nanoindentation and original testing procedures, to access local and global strength values for hard second phase particles. Materials systems to be investigated are: (i) ceramic particles for the reinforcement of metal composites; (ii) silicon in aluminium, (iii) cementite and MC carbides in steel. Defects limiting the strength of these hard brittle phases suggested by mechanical testing are to be identified by means of microstructural characterization, electron microscopy notably, of both virgin and tested particles.
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Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
Processing and micro-mechanical characterization of multi-component transition MC carbides in iron
Journal of the European Ceramic Society. 2021-03-06. Vol. 41, num. 7, p. 3937-3946. DOI : 10.1016/j.jeurceramsoc.2021.02.044.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
On the diametric compression strength test of brittle spherical particles
European Journal Of Mechanics A-Solids. 2018-11-01. Vol. 72, p. 148-154. DOI : 10.1016/j.euromechsol.2018.04.016.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
Meridian crack test strength of plasma-sprayed amorphous and nanocrystalline ceramic microparticles
ACTA MATERIALIA. 2018. Vol. 145, p. 278-289. DOI : 10.1016/j.actamat.2017.12.031.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
In-situ strength of individual silicon particles within an aluminium casting alloy
Acta Materialia. 2018. Vol. 143, p. 67-76. DOI : 10.1016/j.actamat.2017.09.058.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
Mechanical properties of MC multimetallic carbides in steel
Lausanne, EPFL, 2018.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
Stable room-temperature micron-scale crack growth in single-crystalline silicon
Journal Of Materials Research. 2017. Vol. 32, num. 19, p. 3617-3626. DOI : 10.1557/jmr.2017.238.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
The local strength of individual alumina particles
Journal Of The Mechanics And Physics Of Solids. 2017. Vol. 109, p. 34-49. DOI : 10.1016/j.jmps.2017.08.005.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
Probing the micromechanical strength of oxide ceramic composite reinforcements
Lausanne, EPFL, 2017.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
Strength and fracture of silicon second-phase particles in aluminium casting alloys
Lausanne, EPFL, 2017.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
Microscopic strength of silicon particles in an aluminium–silicon alloy
Acta Materialia. 2016. Vol. 105, p. 165-175. DOI : 10.1016/j.actamat.2015.12.006.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
Fracture toughness measurement in fused quartz using triangular chevron-notched micro-cantilevers
Scripta Materialia. 2016. Vol. 112, p. 132-135. DOI : 10.1016/j.scriptamat.2015.09.032.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
The local strength of microscopic alumina reinforcements
Acta Materialia. 2015. Vol. 100, p. 215-223. DOI : 10.1016/j.actamat.2015.08.026.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
On measuring fracture toughness under load control in the presence of slow crack growth
Journal Of The European Ceramic Society. 2015. Vol. 35, num. 11, p. 3155-3166. DOI : 10.1016/j.jeurceramsoc.2015.04.004.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.