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MM: Fachverband Metall- und Materialphysik
MM 50: Topical Session: Interface-dominated phenomena - Thermodynamics and Microstructure Evolution
MM 50.4: Vortrag
Donnerstag, 19. März 2020, 11:15–11:30, IFW A
Atomistic modeling of the influence of precipitates on the yield strength in Al-Ni-Zr eutectic alloys — •Daniel Mutter1, Johannes Preußner1, Daniel F. Urban1, and Christian Elsässer1,2 — 1Fraunhofer IWM, Freiburg, Germany — 2University of Freiburg, FMF, Germany
Lightweight construction is important to achieve resource efficient design, particularily in the mobility sector to reduce fuel combustion and CO2 emission. In order to fulfill the weight, stability and safety requirements, the materials for this purpose have to be light and at the same time exhibit high specific yield strengths. Al is the most important element in this context, and the existence of a eutectic point in many binary Al-alloys (such as Al-Si, Al-Ni or Al-Ca) further facilitates production processes and leads to alloys with good mechanical properties. By including small amounts of additional elements to the eutectic composition and cooling the melt below the critical temperature, finely dispersed intermetallic phases can form. Their existence within the Al matrix has a strong influence on the mobility of dislocations and can strengthen the material considerably (precipitation hardening). Here, we present results of atomistic modeling and simulation of underlying effects in the Al-Ni system with Zr additives, such as anti-phase boundary energies or shear moduli mismatches between the matrix (fcc-Al) and the precipitate phase, which was shown to consist of L12 ordered Al3Zr. The properties and a possible influence of the phase boundary between matrix and eutectic phase (Al3Ni) are also discussed.