Regensburg 2002 – scientific programme

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M: Metallphysik

M 21: Symposium on Structurally Complex Alloy Phases III (SCAP III)

M 21.2: Talk

Thursday, March 14, 2002, 14:30–15:00, H16

Mechanical properties of large-unit cell intermetallic compounds — •Michael Feuerbacher — Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, 52425 Jülich

The plastic properties of complex intermetallic compounds with large unit cells have hardly been investigated to date. However, principle physical questions arise, concerning the mechanisms of plasticity in these materials: What is the structure of defects, particularly of dislocations, if the translational invariant distances are much larger than energetically acceptable Burgers vector lengths? What are the mechanisms of dislocation movement in such complex structures? Will planar faults be introduced upon dislocation movement? Is the macroscopic plastic behaviour comparable to that of ordinary crystals with simpler structures?

In this contribution we will address these questions, reviewing current work in the field of plasticity of large-unit-cell intermetallics. We will present experimental results on the investigation of orthorhombic ξ′-Al-Pd-Mn and cubic β-AlMg, two complex intermetallic compounds with 318 and 1168 atoms per unit cell, respectively.