Research for Creation of High-Strength Structures and Joints by Setting up Local Material Properties

2007 ◽  
Vol 22 ◽  
pp. 1-4
Author(s):  
Heinz Palkowski ◽  
Kai Michael Rudolph
Keyword(s):  
Material Properties ◽  
Collaborative Research ◽  
High Strength ◽  
Research Centre ◽  
German Research Foundation ◽  
Local Material ◽  
German Research ◽  
Local Material Properties

This paper presents the focus of research and the structure of the Collaborative Research Centre SFB 675 “Creation of High-Strength Structures and Joints by setting up local material properties” funded in 2006 by the German Research Foundation (DFG).

Low Heat Joining – Manufacture and Fatigue of Soldered Locally Strengthened Structures

2007 ◽  
Vol 22 ◽  
pp. 101-111
Author(s):  
Alfons Esderts ◽  
Volker Wesling ◽  
Rainer Masendorf ◽  
A. Schram ◽  
Tim Medhurst
Keyword(s):  
Fatigue Life ◽  
Material Properties ◽  
High Strength ◽  
Local Material ◽  
Process Reliability ◽  
Low Distortion ◽  
Local Material Properties ◽  
Joining Process

The advantages of low heat joining techniques, such as low distortion and little influence on the local material properties due to the low introduced amount of heat, shall be made usable for the manufacture of high strength structures by increasing the process reliability. The dependency between the parameters of the joining process, the seam geometry, the type of solder, the load type und the fatigue life especially of soldered structure with local strengthening shall be examined to allow a calculative estimation of the part’s life.

Artificial Ageing Behaviour of Al-4Zr Micro Sheets

2013 ◽  
Vol 765 ◽  
pp. 456-460
Author(s):  
Roland von Bargen ◽  
Axel von Hehl ◽  
Hans Werner Zoch
Keyword(s):  
Collaborative Research ◽  
Precipitation Hardening ◽  
High Strength ◽  
Research Centre ◽  
Artificial Ageing ◽  
Scanning Calorimetry ◽  
German Research Foundation ◽  
Tem Analysis ◽  
Cold Forming ◽  
Manufacturing Process Chain

The continuous miniaturization of products needed e.g. in the automotive or the microelectronics sector requires process chains, which allow the manufacturing of microscopically small components in high quantities. The development of the required processes and technologies is the aim of the Collaborative Research Centre 747 “Micro Cold Forming” of the German Research Foundation. As a necessary step in the manufacturing process chain heat treatment enables the adjustment of the semi-finished micro components to cold forming. Finally, the in-service characteristics of the aluminium components have to be adjusted by precipitation hardening that increases the strength values beyond those which can be achieved by strain hardening. To provide high strength aluminium alloys with an improved thermal stability new alloy concepts and advanced production processes have been developed within the Collaborative Research Centre (CRC). Besides the scandium containing foils made of alloy Al-2Sc, foils of a novel alloy Al-4Zr with approximately 4 mass-% Zirconium has been produced by means of physical vapour deposition (PVD). In contrast to conventional strip casting techniques the PVD process operates with low temperatures, which should suppress premature precipitation during the foil production and ensure the supersaturated solid solution that is a prerequisite for precipitation hardening. Samples of this material were subsequently artificially aged and characterized by ultra micro hardness measurements (UMH), transmission electron microscopical (TEM) analysis and differential power scanning calorimetry (DPSC) to evaluate the applied aging parameters.

Precipitation Hardening Behaviour of Al-2Sc Micro Sheets

2011 ◽  
Vol 690 ◽  
pp. 327-330 ◽  
Author(s):  
Roland von Bargen ◽  
Axel von Hehl ◽  
Hans Werner Zoch
Keyword(s):  
Collaborative Research ◽  
Precipitation Hardening ◽  
Temperature Stability ◽  
High Strength ◽  
Research Centre ◽  
German Research Foundation ◽  
Tem Analysis ◽  
Cold Forming ◽  
Thin Foils ◽  
Manufacturing Process Chain

The continuous miniaturisation of products needed e.g. in the automotive or the micro electronic sector requires process chains which allow the manufacturing of microscopically small components in high quantities. The development of the required processes and technologies is the aim of the Collaborative Research Centre 747 “Micro Cold Forming” of the German Research Foundation. A necessary step in the manufacturing process chain is the heat treatment, which enables the adjustment of the semi-finished micro components to cold forming. Finally the usage properties have to be adjusted e.g. by precipitation hardening of aluminium alloys in order to increase the strength above the strain hardened level. To achieve a high strength aluminium alloy with elevated temperature stability in form of thin foils a new Al-Sc alloy with 2 mass-% scandium had to be developed within the Collaborative Research Centre. In comparison to conventional casting techniques it was possible to suppress Al3Sc precipitation and to ensure the supersaturated solid solution by using a Physical Vapour Deposition (PVD) Magnetron Sputtering process and low sputtering temperatures. Samples of the material are then artificially aged and characterised by ultra micro hardness measurements to evaluate the optimal ageing parameters. Besides this the microstructure was determined by light microscopy and Transmission Electron Microscopical (TEM) analysis.

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