Analysis of compositionally ungraded FGM analogues: Neutron diffraction measurements of residual stress and mechanical testing of pressure sintered Mo-Y2O3 and Mo-Al2O3

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dc.contributor.authorSaleh, Men_AU
dc.contributor.authorChavara, Den_AU
dc.contributor.authorToppler, Ken_AU
dc.contributor.authorAlexander, Jen_AU
dc.contributor.authorRuys, AJen_AU
dc.contributor.authorKaveh, Ken_AU
dc.contributor.authorLuzin, Ven_AU
dc.date.accessioned2017-02-20T04:47:00Zen_AU
dc.date.available2017-02-20T04:47:00Zen_AU
dc.date.issued2015-05en_AU
dc.date.statistics2017-02-20en_AU
dc.description.abstractFunctionally graded materials (FGMs) are a type of naturally inspired composite materials whose properties (e.g. microstructure, chemical or phase composition) vary over one or more dimensions. The FGMs were first proposed as an advanced engineering material in 1972 and research into application for Biomaterials, Aerospace, Chemical Plants, Mining, and Building material commodities[1, 2] is ever present. Within the nuclear industry FGMs can be engineered to effectively resist corrosion, radiation and are a potential choice for nuclear reactor components e.g. first wall for fusion reactors and fuel pellets. Additionally FGM’s have been proposed as potential plasma facing components (PFC) whereby the PFC would gradually vary from a refractory material (tungsten, plasma face) to a heat sink material (copper, coolant side). In the case of a metal-ceramic FGM, the composite mates the strength and ductility of a metal with the hardness and toughness of a ceramic [3-5]. The authors have sought to elucidate the development of residual stress in FGMs using neutron measurements on the Kowari Strain Scanner, ANSTO for the Mo-Y2O3 and Mo-Al2O3 system. Due to their extreme gradients FGM’s are not optimal for fast neutron measurements due to the high spatial resolution requirements and long measurement times. An alternative approach was employed to examine compositionally ungraded analogues of varying metal-ceramic ratios. All sample were manufactured using constituent powders, mixed and subsequently sintered using a hot press with close monitoring of the sintering curve. Optical microscopy and scanning electron microscopy were used to look at the resultant samples to observe the grain growth and the defect-like cracks attributable to the thermally induced stresses. Relaxation due to micro cracking and micro-fracturing are evaluated in light of the neutron residual stress measurements and mechanical strength measurements of : (a) bending stiffness using a three point bend tests, (b) bulk modulus through GrindoSonic techniques and (c) statistically averaged micro-hardness. Further evaluation of the residual stress is done through comparison between established analytical models, neutron diffraction and preliminary FEA. The major contribution of residual stress are further realised and evaluated in light of the interfacial instabilities present and the appropriate ways to optimise the thermal protection characteristics of a compositional gradient.en_AU
dc.identifier.citationSaleh, M., Chavara, D., Toppler, K., Alexander, J., Ruys, A., Kabir, K., & Luzin, V. (2015). Analysis of compositionally ungraded FGM analogues: Neutron diffraction measurements of residual stress and mechanical testing of pressure sintered Mo-Y2O3 and Mo-Al2O3. Paper presented at the 12th International Conference on the Mechanical Behavior of Materials (ICM12) - Karlsruhe, May 10-14, 2015, (pp. 112).en_AU
dc.identifier.conferenceenddate14 May 2015en_AU
dc.identifier.conferencename12th International Conference on the Mechanical Behavior of Materials (ICM12)en_AU
dc.identifier.conferenceplaceKarlsruhe, Germanyen_AU
dc.identifier.conferencestartdate10 May 2015en_AU
dc.identifier.govdoc7909en_AU
dc.identifier.urihttps://www.iam.kit.edu/downloads/Book_of_Abstracts_ICM12.pdfen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/8322en_AU
dc.language.isoenen_AU
dc.publisherKarlsruhe Institute of Technologyen_AU
dc.subjectMicrostructureen_AU
dc.subjectCorrosionen_AU
dc.subjectMaterialsen_AU
dc.subjectNuclear industryen_AU
dc.subjectMicroscopyen_AU
dc.subjectStressesen_AU
dc.titleAnalysis of compositionally ungraded FGM analogues: Neutron diffraction measurements of residual stress and mechanical testing of pressure sintered Mo-Y2O3 and Mo-Al2O3en_AU
dc.typeConference Paperen_AU
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