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M: Metallphysik
M 38: Mechanische Eigenschaften I
M 38.2: Vortrag
Dienstag, 8. März 2005, 10:45–11:00, TU H111
Measurement of crack growth rate of magnesium alloy AZ31 — •Zuzana Zuberova1, Ludvik Kunz2, Ralph Jörg Hellmig1, and Juri Estrin1 — 1Institut für Werkstoffkunde und Werkstofftechnik, TU Clausthal, Agricolastr. 6, 38678 Clausthal-Zellerfeld — 2Academy of Sciences of the Czech Republic, Institute of Physics of Materials, Brno, Czech Republic
In this work the crack growth rate for magnesium alloy AZ31 was investigated. This alloy was produced as squeeze cast material with low porosity and with a grain size of about 450 µm. For determining the crack growth rate a resonant machine (Amsler 5100) was used. The experiment was run in load amplitude control by symmetrical sinusoidal load cycles with a frequency of 145 ± 5 Hz. The crack propagation was investigated by optical microscopy, showing multiple branching of the magistral crack. Paris equation was shown to hold despite a large scatter in experimental data. A threshold intensity factor of Kath = 0.8 MPa·m1/2 was determined.