Johannes Albert Österreicher

AIT Austrian Institute of Technology | ait · LKR Light Metals Technologies

Development of improved lithium-containing compounds and alloys are critical to meet energy reduction roadmaps. However, progress in many applications is hindered by the inability to spatially resolve the distribution of lithium at the microscale using conventional analytical techniques such as energy dispersive X-ray spectroscopy (EDS) in the scan...

Room-temperature cyclic deformation of age-hardenable alloys can produce similar strength as artificial ageing in much shorter time, but industrial applicability is limited due to the high number of required cycles. As an alternative, fewer cyclic deformation steps can be combined with traditional artificial ageing: Introducing a small plastic defo...

The quantification of lithium in electron microscopes by energy-dispersive X-ray spectroscopy (EDS) is highly challenging due to the low energy of the characteristic X-rays. Only special windowless detectors can detect Li, yet the sensitivity is suboptimal (i.e., ~20 wt. %). We introduce the use of quantitative backscattered electron microscopy in...

Two-step ageing of 7xxx series alloys can reduce ageing time while obtaining similar mechanical properties as a longer isothermal heat treatment. In this paper, an intermediate deep-drawing step at 120–160 °C is introduced to produce elongated cup–shaped parts with near-T6 strength. A Cu-containing (Alclad 7075) and a non-standard low-Cu alloy (702...

Der Fokus der 11. Tagung stand klar im Zeichen von Dekarbonisierung und Digitalisierung. Die erste Session „Werkstoffentwicklung und Materialcharakterisierung“ war geprägt durch die Präsentation neuartiger Legierungskonzepte im Aluminium- und Magnesiumbereich. Die zweite Session „Prozessentwicklung – experimentell und numerisch“ enthielt Vorträge z...

The quantification of lithium in electron microscopes by energy-dispersive X-ray spectroscopy (EDS) is highly challenging due to the low energy of the characteristic X-rays. Only special windowless detectors can detect Li, yet the sensitivity is suboptimal (i.e., ~20 wt. %). We introduce the use of quantitative backscattered electron microscopy in...

Due to their high specific strength, magnesium alloys are promising materials for further lightweighting in mobility applications. In contrast to casting and forming processes, additive manufacturing methods allow high degrees of geometrical freedom and can generate significant weight reductions due to load-specific part design. In wire arc additiv...

Aluminium alloys of the 7xxx series are attracting the attention of automakers due to their high specific strength. However, widespread use of 7xxx series alloys for the production of car parts from sheet metal has so far been prevented due to their low formability at room temperature and the fact that conventional automotive paint-bake cycles are...

During deep‐drawing of Al‐Mg sheet at room temperature, stretcher‐strain marks can appear on the material's surface. Such parts are not suitable for car outer body applications because the visually unappealing marks are still visible after painting. In this paper, the occurrence of surface marks on a miniaturized engine hood is significantly reduce...

Due to their high specific strength, EN AW-7xxx aluminium alloys are promising materials for reducing the weight of automotive structural parts. However, their formability at room temperature is poor due to pronounced natural ageing. Therefore, we investigated hot stamping and W-temper forming for EN AW-7075 and a modified variant of EN AW-7021. Fo...

Attenuation of Rayleigh-type surface acoustic waves induced by grain-boundary scattering is studied experimentally and theoretically by an effective medium approach. A frequency domain opto-acoustic laboratory setup, capable of measuring a coherent Rayleigh wave response by emulating an ensemble average via spatial averaging, is presented. Measurem...

High strength Al-Zn-Mg(-Cu) alloys are rarely used in the automotive industry due to pronounced natural ageing after quenching and resulting poor formability at room temperature. Furthermore, the paint bake response is often suboptimal. To overcome these challenges, we performed various low temperature pre-ageing treatments followed by storage at r...

Measuring the dimensions and number density of nanoparticles dispersed in a solid matrix is usually accomplished via transmission electron microscopy (TEM) which suffers from high cost, low throughput, and small analytical volume. In comparison, scanning backscattered electron microscopy is inexpensive, requires little sample preparation, and allow...

Sicherheitsbauteile aus Aluminium unterliegen höchsten Anforderungen im Fahrzeugbau. Das Leichtmetallkompetenzzentrum Ranshofen und Hammerer Aluminium Industries Extrusion haben die Crasheigenschaften eines Strangpressprofils mittels Legierungsmodifikation und geometrischer Anpassung des Querschnitts verbessert. Dabei erhöhten sie die Energieabsorp...

Safety components made of aluminium have the highest requirements in vehicle design. As part of a customer project, the crash properties of an extruded profile are improved by means of alloy modification and geometric adaptation of the cross section. An increase in energy absorption and reduction of cracking has been achieved.

Die Erfindung betrifft Verfahren zur Herstellung eines Objektes für optische Anwendungen aus einer Aluminiumbasislegierung, wobei das Objekt mit gegebenenfalls durchgehenden Löchern ausgebildet ist, wobei ein Objekt aus einer Aluminiumbasislegierung bereitgestellt wird, wonach im Objekt intrakristalline Ausscheidungen gebildet werden, wonach die in...

The ever-increasing requirements of the automotive industry in terms of crash performance necessitate the development of high strength modifications of the EN AW-6082 alloy. The high amounts of strengthening elements such as Mg, Si, Cr, Mn, and Cu can lead to poor extrudability. The present work shows the impact of microstructure on the crash perfo...

The ever-increasing requirements of the automotive industry in terms of crash performance, short- and long-time mechanical properties, corrosion resistance, and recrystallization stability of extruded profiles necessitate the development of high strength modifications of the EN AW-6082 alloy. However, high amounts of strengthening elements such as...

The ever-increasing requirements of the automotive industry in terms of crash performance necessitate the development of high strength modifications of the EN AW-6082 alloy. High amounts of strengthening elements such as Mg, Si, Cr, Mn, and Cu can lead to poor extrudability. The present work presents a statistical method for analysing the parameter...

Aluminium ist der Leichtbauwerkstoff der Gegenwart und der Zukunft. Durch den geschickten Einsatz von Aluminium können neue Leichtbaulösungen verwirklicht werden, die sonst nur schwer oder nicht zu realisieren gewesen wären. Der Werkstoff Aluminium bietet ein hohes Maß an Entwicklungspotential. Hier stehen wir erst am Anfang der Entwicklung im Verg...

The ever-increasing requirements of the automotive industry in terms of crash performance, short- and long-time mechanical properties, corrosion resistance, and recrystallization stability of extruded profiles necessitate the development of high strength modifications of the EN AW-6082 alloy. However, high amounts of strengthening elements such as...

The kinetics of glucose oxidase (GOD) and horseradish peroxidase (HRP) on a transparent gelatin–ionic liquid functional polymer has been investigated using a colorimetric assay of H2O2 with phenol-4-sulfonic acid and 4-aminoantipyrine, as color-generating precursors.The effect of different ionic liquids 1-ethyl-3-methyl-imidazolium ethyl sulfate ([...

The kinetics of Glucose oxidase (GOD) and Horseradish peroxidase (HRP) on a transparent Ion Jelly biopolymer has been investigated using a colorimetric assay of H2O2 with phenol-4-sulfonic acid and 4-aminoantipyrine, as color-generating precursors. The activity of GOD and HRP on the Ion Jelly biopolymer solid disk formed in the bottom of the well E...

The kinetics of Glucose oxidase (GOD) and Horseradish peroxidase (HRP) on a transparent Ion Jelly biopolymer has been investigated using a colorimetric assay of H2O2 with phenol-4-sulfonic acid and 4-aminoantipyrine, as color-generating precursors. The activity of GOD and HRP on the Ion Jelly biopolymer solid disk formed in the bottom of the well E...