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Titel: Relating fracture toughness to micro-pillar compression response for a laser powder bed additive manufactured bulk metallic glass
VerfasserIn: Best, James P.
Ast, Johannes
Li, Bosong
Stolpe, Moritz
Busch, Ralf
Yang, Fan
Li, Xiaopeng
Michler, Johann
Kruzic, Jamie J.
Sprache: Englisch
Titel: Materials Science and Engineering: A
Bandnummer: 770 (2020)
Verlag/Plattform: Elsevier
Erscheinungsjahr: 2019
DDC-Sachgruppe: 500 Naturwissenschaften
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: A Zr-based bulk metallic glass produced using selective laser melting (SLM) was compared to the same alloy fabricated using traditional suction-casting. Analysis of the fracture toughness through single edge notched beam bending experiments showed a significantly reduced damage tolerance for the laser-processed material (KQ ~ 138.0 ± 13.1 → 28.7 ± 3.7 MPa √m), even though X-ray diffraction and microhardness responses were identical. Using uniaxial quasistatic micro-pillar compression, it was found that as-cast samples more readily underwent shear transformations (evidenced through discrete load drops) below the nominal 0.2% yield stress, which was connected to the higher macroscopic toughness. Differential scanning calorimetry demonstrated that the increased barrier to shear transformation for the SLM material could not be explained by the relative relaxation states. Rather, it was attributed to the greater dissolved oxygen concentration in the laser-processed material, which is postulated to decrease atomic mobility in the structure and thereby increase the activation energy required to initiate shear transformations.
DOI der Erstveröffentlichung: 10.1016/j.msea.2019.138535
URL der Erstveröffentlichung: https://www.sciencedirect.com/science/article/abs/pii/S0921509319313218
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-396507
hdl:20.500.11880/35727
http://dx.doi.org/10.22028/D291-39650
ISSN: 0921-5093
Datum des Eintrags: 3-Mai-2023
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Materialwissenschaft und Werkstofftechnik
Professur: NT - Prof. Dr. Ralf Busch
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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