Philipp Wittke

Philipp Wittke
Julius vom Hofe GmbH & Co. KG

Dr.-Ing.

About

25
Publications
2,818
Reads
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178
Citations
Citations since 2017
11 Research Items
131 Citations
20172018201920202021202220230102030
20172018201920202021202220230102030
20172018201920202021202220230102030
20172018201920202021202220230102030
Additional affiliations
February 2020 - present
Julius vom Hofe GmbH & Co. KG
Position
  • Manager
September 2011 - January 2020
Technische Universität Dortmund
Position
  • Group Leader

Publications

Publications (25)
Article
Full-text available
Thermally sprayed protective coatings are applied onto many mechanically stressed components such as support structures, shafts, turbine blades or heat exchangers. In addition to the static or cyclic load, a superimposition with corrosion processes occurs in many cases. Thermal sprayed ZnAl coatings are known for their performant corrosion protecti...
Book
Philipp Wittke charakterisiert spanlos gefertigte Innengewinde aus den Aluminium- und Magnesiumlegierungen AlSi10Mg, AZ31 und AZ91. Neben der Entwicklung einer zerstörungsfreien Methode zur Beurteilung der Gewindequalität werden vom Autor grundlagenorientierte Untersuchungen durchgeführt, um den Einfluss von Prozessparametervariationen während der...
Article
Full-text available
The possibility of producing profiles directly by hot extrusion of aluminum chips, normally considered as scrap, is a promising alternative to the energy-intensive remelting process. It has to be taken into account that the mechanical properties depend on the quality of the weld seams between the chips, which arise during the extrusion process. To...
Chapter
Due to a great potential for conserving resources, the direct recycling of aluminum chips by hot extrusion is a promising alternative to energy-intensive remelting process. The mechanical properties of cast-based and chip-based specimens of AW6060 aluminum alloy were characterized by means of mechanical quasistatic and cyclic experiments. The respo...
Article
Due to their low density and high strength-to-weight-ratio magnesium alloys are very attractive for lightweight construction. Especially creep-resistant magnesium alloys can also be applied in the engine area of automobiles and therefore offer a high potential for weight reduction. For a safe and efficient use in such applications at elevated tempe...
Conference Paper
Magnesiumlegierungen sind aufgrund ihrer geringen Dichte und hohen spezifischen Festigkeit sehr attraktiv für Leichtbauanwendungen. Insbesondere kriechbeständige Magnesiumlegie-rungen können auch in temperaturbelasteten Anwendungen, wie z.B. im Motorraum von Automobilen, genutzt werden und bieten daher ein enormes Leichtbaupotential. Voraussetzunge...
Article
Full-text available
In this study, the influence of friction drilling tool pre-heating on mechanical properties of chipless manufactured internal threads in thin-walled AZ91 magnesium casting alloy profiles is investigated. In this context, the influence of manufacturing processes on microstructure and the resulting fracture behavior during mechanical loading are in f...
Conference Paper
The aim of this study is the comparative investigation of the cyclic creep (ratcheting) behavior of mag-nesium alloy Mg-4Al-2Ba-2Ca (DieMag422) under different load ratios. Cyclic tests in tensile and compressive load ratios have been performed at room temperature. Fatigue strengths were estimated in load increase tests based on structure-sensitive...
Article
The corrosion fatigue behavior of extruded magnesium alloys AZ31 and ME20 was characterized by means of load increase tests in 5 wt.-% NaCl solution. The results were correlated with the respective corrosion behaviors investigated in immersion tests and by means of microstructural investigations after precorrosion. ME20 exhibited a superior corrosi...
Article
Full-text available
Front face flow drilling, which has been investigated at the Institute of Machining Technology (ISF), TU Dortmund University, represents a new application of the conventional flow drilling process. With this new technique it is possible to form closed holes with diameters, which can exceed the local wall thickness of the profile. By using a subsequ...
Article
Full-text available
Metallic lightweight materials are used for enhancing dynamic range, resource optimization and emission reduction in many fields of traffic engineering, whereby aluminium and magnesium components are manufactured by means of welded, adhesive and screw joints. Friction drilling, as forming process with subsequent manufacturing of threads, offers the...
Conference Paper
Creep-resistant magnesium alloys offer a high potential for lightweight construction, e.g. in automotive applications. However, their application range is strongly limited due to their low corrosion resistance. In the present study the corrosion fatigue behaviors of the creep-resistant alloys DieMag422 and AE42 were comparatively characterized. Fat...
Article
Full-text available
Aluminum alloys are used for enhancement of dynamic range, resource optimization and emission reduction in many fields of traffic engineering, whereby aluminum components are manufactured by means of welded, adhesive and screw joints. Friction drilling, as forming process with subsequent manufacturing of threads, offers the opportunity to produce a...
Article
Full-text available
Low corrosion resistance of magnesium alloys strongly limits their application range. This study aims at the investigation of corrosion influence on microstructure and depending mechanical properties of newly developed magnesium alloy Mg-4Al-2Ba- 2Ca. The fatigue properties of this creep-resistant magnesium alloy were investigated under three corro...
Conference Paper
Der Einsatz von Magnesiumlegierungen in Leichtbauanwendungen wird durch deren geringe Korrosionsbeständigkeit begrenzt. Gegenstand dieser Untersuchungen ist der Einfluss von Korrosion auf die Mikrostruktur und die damit verbundenen mechanischen Eigenschaften der neuent-wickelten, kriechbeständigen Magnesiumlegierung Mg-4Al-2Ba-2Ca. Das Korrosionser...
Article
The corrosion behavior as well as the microstructure in initial state and after corrosive deterioration were investigated for the newly developed Mg–Al–Ba–Ca alloy DieMag422. In order to investigate the corrosion behavior, potentiodynamic polarization measurements and immersion tests were performed in different NaCl concentrations. The microstructu...
Article
Full-text available
Kurzfassung Der Einfluss von Korrosion auf die Mikrostruktur und die damit einhergehenden mechanischen Eigenschaften der kriechbeständigen bariumhaltigen Mg-Al-Ca-Legierung DieMag422 wurden untersucht. Zur Bewertung des Korrosionsverhaltens wurden potenziodynamische Polarisationsmessungen und Immersionsversuche in pH7 mit und ohne Natriumchlorid du...
Conference Paper
Aluminiumlegierungen werden zur Dynamiksteigerung, Ressourcenschonung und Emissionsminderung in vielen Bereichen der Verkehrstechnik eingesetzt, wobei Aluminiumbauteile mit Hilfe von Schweiß-, Löt-, Klebe- oder Schraubverbindungen hergestellt werden. Das Fließbohren, als umformendes Verfahren in Kombination mit anschließender Gewindefertigung, biet...
Article
The development of creep-resistant magnesium alloys that avoid the use of rare-earth alloying elements is an important area of research. The creep response of Mg–Al–Ca alloy containing barium (DieMag422) was compared to that of commercially available creep resistant magnesium alloys AE42 and MRI230D. The creep tests were performed between 175 °C an...
Conference Paper
The influence of corrosion on the microstructure and the dependent mechanical properties were investigated for the new creep-resistant magnesium alloy DieMag422. For the study of the corrosion behaviour, potentiodynamic polarization measurements and immersion tests were performed at pH7 with and without sodium chloride. The microstructure-related a...
Conference Paper
Der industrielle Einsatz von Magnesiumlegierungen ist durch ihre geringe Korrosionsbeständigkeit eingeschränkt. Zur Bewertung des Einflusses korrosiver Schädigung auf das Ermüdungsverhalten der neuentwickelten kriechbeständigen Magnesiumlegierung DieMag422 wurde das Korrosionsverhalten mittels potentiodynamischer Polarisationsmessungen und Immersio...

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