Interface reactions occurring in metal-ceramic interpenetrating phase composites manufactured by using semi-solid forming technology

2020 ◽  
Vol 3 (2) ◽  
pp. 222-230 ◽  
Author(s):  
Laura Schomer ◽  
Marius Kütemeyer ◽  
Mathias Liewald
Keyword(s):  
Interface Reactions ◽  
Forming Technology ◽  
Metal Ceramic ◽  
Semi Solid ◽  
Interpenetrating Phase Composites

Structural Characteristics of Metal-Ceramic Interpenetrating Phase Composites Manufactured by Using Semi-Solid Forming Technology

2019 ◽  
Vol 285 ◽  
pp. 51-56 ◽  
Author(s):  
Laura Schomer ◽  
Mathias Liewald
Keyword(s):  
Composite Materials ◽  
Ceramic Body ◽  
Structural Characteristics ◽  
Interface Reactions ◽  
Forming Technology ◽  
Reinforced Composite ◽  
Mould Filling ◽  
Metal Ceramic ◽  
Semi Solid ◽  
Interpenetrating Phase Composites

Interpenetrating Phase Composites (IPC) belong to a special subcategory of composite materials and reveal enhanced properties compared to the more common particle or fibre reinforced composite materials. However, as the use of conventional manufacturing processes creates structural deficits, these IPC are not able to exploit their complete potential. In this respect, infiltration of open-pore bodies from alumina with an aluminium alloy in the semi-solid state offers great perspectives for manufacturing of IPC. In this context, this paper is focusing on significant structural characteristics of metal-ceramic IPC produced in this way by using a tool with an open die cavity. Thereby, the macroscopic mould filling, possible damage of the ceramic body, the residual porosity, the filling of microporosity of the cell walls and possible interface reactions depending on the thermal parameters of the manufacturing process were investigated in this paper.

Bending Strength and Fracture Behaviour of Metal-Ceramic Interpenetrating Phase Composites Manufactured by Using Semi-Solid Forming Technology

2022 ◽  
Vol 327 ◽  
pp. 111-116
Author(s):  
Laura Schomer ◽  
Kim Rouven Riedmüller ◽  
Mathias Liewald
Keyword(s):  
Bending Strength ◽  
Fracture Behaviour ◽  
Structural Characteristics ◽  
Process Window ◽  
Metallic Material ◽  
Forming Technology ◽  
Metal Ceramic ◽  
Semi Solid ◽  
The Impact ◽  
Interpenetrating Phase Composites

Interpenetrating Phase Composites (IPC) belong to a special category of composite materials, offering great potential in terms of material properties due to the continuous volume structure of both composite components. While manufacturing of metal-ceramic IPC via existing casting and infiltration processes leads to structural deficits, semi-solid forming represents a promising technology for producing IPC components without such defects. Thereby, a solid open pore body made of ceramic is infiltrated with a metallic material in the semi-solid state. Good structural characteristics of the microstructure as the integrity of the open-pore bodies after infiltration and an almost none residual porosity within the composites have already been proven for this manufacturing route within a certain process window. On this basis, the following paper focuses on the mechanical properties such as bending strength of metal-ceramic IPC produced by using semi-solid forming technology. Thereby, the impact of the significant process parameters on these properties is analysed within a suitable process window. Furthermore, a fractographic analysis is carried out by observing and interpreting the fracture behaviour during these tests and the fracture surface thereafter.

Production of Aluminium Based Interpenetrating Phase Composites Using Semi-Solid Forming

2016 ◽  
Vol 716 ◽  
pp. 502-509 ◽  
Author(s):  
Christoph Seyboldt ◽  
Mathias Liewald ◽  
Daniel Heydt
Keyword(s):  
Liquid Phase ◽  
Aluminium Alloy ◽  
Ceramic Materials ◽  
Raw Material ◽  
Phase Fraction ◽  
Forming Process ◽  
Ceramic Foams ◽  
Forming Technology ◽  
Semi Solid ◽  
Interpenetrating Phase Composites

The following paper deals with the production of Interpenetrating Phase Composites (IPC) using semi-solid forming technology. Therefore, adequate ceramic foams were selected and infiltrated by processing the aluminium alloy A356 in the semi-solid state. In the studies presented in this paper, the infiltrations of two ceramic materials (Al2O3 and SiC) with three different pore sizes (10, 20 and 30 ppi) were investigated. During the forming process the liquid phase fraction of the aluminium was varied to analyze infiltration effects in relation to the raw material´s liquid phase fraction. Afterwards, microsections of the produced specimens were analyzed in order to characterize their microstructure and the quality of infiltration. The results showed that completely filled composite components with good mechanical properties can be produced by infiltrating ceramic preforms with a semi-solid aluminium alloy.

Experimental Research on the Semi-Solid Formability of 7A09 Aluminum Alloy Impeller

2011 ◽  
Vol 189-193 ◽  
pp. 3852-3856
Author(s):  
Fei Han ◽  
Wei Wei Wang ◽  
Shou Jing Luo ◽  
Zhi Ming Du
Keyword(s):  
Heating Temperature ◽  
Hydraulic Press ◽  
Holding Time ◽  
Forming Process ◽  
Forming Technology ◽  
Preheating Temperature ◽  
Complicated Geometry ◽  
Semi Solid ◽  
Wrought Aluminum Alloys ◽  
Wrought Aluminum

The impeller is an important component applied in airplanes, ships and weapons. It is difficult to form the complicated geometry of the impeller by using the conventional forging and casting technology. Semi-solid forming is a promising forming process that can produce complicated and high-quality components of wrought aluminum alloys. In this paper, the formability of the impeller was investigated by using advanced semi-solid forming technology and self-designed combined die, as well as quick forging hydraulic press. Experimental results show that the formability of the impeller increases with the increase of reheating temperature and holding time of the billet. When heating temperature and holding time during the pretreatment of the billet were 620°C and 25 min respectively, reheating temperature and holding time of the billet before thixoforging were 600°C and 90 min respectively, preheating temperature of the die was 320°C , the impeller was formed perfectly on the quick forging hydraulic press.

Fügen von Aluminium- und Kohlenstofffaserstrukturen*/Joining of aluminium and carbon fibre structures - An innovative joining technology based on semi-solid forming strategies

2017 ◽  
Vol 107 (10) ◽  
pp. 743-747
Author(s):  
M. Prof. Liewald ◽  
L. Marx
Keyword(s):  
Carbon Fibre ◽  
Metal Forming ◽  
Carbon Fabric ◽  
Forming Technology ◽  
Joining Technology ◽  
Aluminium Sheets ◽  
Semi Solid ◽  
The University ◽  
The Impact

Das Institut für Umformtechnik (IFU) an der Universität Stuttgart befasst sich derzeit mit der Entwicklung eines neuartigen Verfahrens zum formschlüssigen Fügen von Aluminium- und Carbonstrukturen. Zwei Aluminiumbleche werden dabei lokal auf ein Temperaturniveau knapp oberhalb ihrer Solidustemperatur erwärmt, sodass ein dazwischenliegendes Carbongewebe durch die dann teilflüssige Aluminiummatrix infiltriert werden kann. Dieser Fachartikel befasst sich mit dem Einfluss wichtiger Prozessparameter.   The Institute for Metal Forming Technology (IFU) of the University of Stuttgart aims at the development of a novel joining method for combining aluminium and carbon fibre structures. Two aluminium sheets with carbon fabric in between are conductively heated by two electrodes up to semi-solid state, so the woven carbon fabric is infiltrated with aluminium. This paper focuses on the impact of different process and sample parameters on the quality of the joint.

Semi-solid Formgebung von AMC-Werkstoffen*/Semi-solid forming of AMC materials - Potential of a new process flow for high performance components

2015 ◽  
Vol 105 (10) ◽  
pp. 669-673
Author(s):  
C. Seyboldt ◽  
T. Schubert ◽  
O. Gerlach ◽  
M. Liewald ◽  
T. Weißgärber ◽  
...  
Keyword(s):  
High Performance ◽  
Aluminum Matrix ◽  
Dimensional Accuracy ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Process Flow ◽  
Forming Technology ◽  
New Process ◽  
Semi Solid ◽  
Complex Parts

Hinsichtlich der Verarbeitung von partikelverstärkten Aluminiummatrix-Verbundwerkstoffen (AMC) zu komplexen Bauteilen mit hoher Endkonturnähe, Maßhaltigkeit und hervorragenden mechanischen Eigenschaften bietet die Formgebung im teilflüssigen Zustand aussichtsreiche Perspektiven. In diesem Zusammenhang beschreibt der Fachbeitrag eine neuentwickelte Prozessroute zur Herstellung von Hochleistungskomponenten aus solchen AMC-Werkstoffen und zeigt deren Potentiale auf.   With regard to the processing of particle-reinforced aluminum matrix composites (AMC) into complex parts with net-shape quality, high dimensional accuracy and favorable mechanical properties, the semi-solid forming technology provides good perspectives. In this context, this article deals with a new process flow for the production of high-performance components from such AMC materials and presents its potential.

Investigation on Slurry Filling Sequence during Semi-Solid Forming of Complex Aluminum Part

2011 ◽  
Vol 704-705 ◽  
pp. 290-295 ◽  
Author(s):  
Kai Kun Wang ◽  
Fu Yu Wang ◽  
Yuan Ning Wang
Keyword(s):  
Processing Method ◽  
Part Quality ◽  
Complex Aluminum ◽  
Forming Technology ◽  
Filling Sequence ◽  
Metal Processing ◽  
Semi Solid ◽  
Aluminum Part ◽  
Extrusion Method

Semi-solid forming technology is a short metal processing method between the liquid casting and solid forming. Many forming factors have been found concerning the quality of the forming part. In this study, the influences of slurry filling sequence were investigated in semi-solid forming one complex aluminum part. Two different slurry filling methods were designed. Method one is thixo-upsetting + compound extrusion, method two is thixo-upsetting + extrusion. The experimental results showed that the optimised method of thixo-upsetting + extrusion could be the best strategy in improving the part quality during thixo-forming of aluminum alloy A356.

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