Microstructure and mechanical properties of constrained shape-memory alloy nanograins and nanowires

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dc.creatorBouville, Mathieu
dc.creatorAhluwalia, Rajeev
dc.date2007-11-07
dc.date.accessioned2026-07-07T09:51:56Z
dc.date.available2026-07-07T09:51:56Z
dc.descriptionWe use the phase-field method to study the martensitic transformation at the nanoscale. For nanosystems such as nanowires and nanograins embedded in a stiff matrix, the geometric constraints and boundary conditions have an impact on martensite formation, leading to new microstructures --such as dots aligned on a square lattice with axes along <01>-- or preventing martensite formation altogether. We also perform tension tests on the nanowires. The stress-strain curves are very different from bulk results. Moreover, they are weakly affected by microstructures -- the mechanical response of nanowires with different microstructures may be similar, while nanowires with the same microstructure may have a different mechanical behavior. We also observe that at the transition temperature, or slightly below it, the narrowest wires behave pseudoelastically whereas wider wires are in the memory-shape regime. Moreover the yield stress does not change monotonically with width: it has a minimum value at intermediate width.
dc.description10 pages, 27 figures
dc.identifierhttps://arxiv.org/abs/0711.1084
dc.identifierhttp://arxiv.org/abs/0711.1084
dc.identifierActa Materialia 56(14), 3558 (2008)
dc.identifierdoi:10.1016/j.actamat.2008.03.041
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/165421
dc.subjectMaterials Science
dc.titleMicrostructure and mechanical properties of constrained shape-memory alloy nanograins and nanowires
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