scholarly journals Influence of Parameters during Induction Heating Cycle of 7075 Aluminium Alloys with RAP Process

2008 ◽  
Vol 141-143 ◽  
pp. 719-724 ◽  
Author(s):  
G. Vaneetveld ◽  
Ahmed Rassili ◽  
H.V. Atkinson
Keyword(s):  
Solid State ◽  
Aluminium Alloy ◽  
Heating Rate ◽  
Induction Heating ◽  
Aluminium Alloys ◽  
Heating Cycle ◽  
Fast Heating ◽  
Globular Microstructure ◽  
Protective Gas ◽  
Semi Solid

Thixoforging involves shaping alloys with a globular microstructure in the semi-solid state. To reach this kind of material, the Recrystallisation and Partial Melting (RAP) process can be used to obtain a globular microstructure from extruded material with liquid penetrating the recrystallised boundaries. Induction heating is used to apply the RAP process to slugs. One of the benefits of using this method of heating is the fast heating rate (20°C/s). This paper will help to improve heating parameters by showing their influence on 7075 aluminium alloy recrystallisation. These parameters are the heating rate; heating frequencies-power; presence or not of protective gas; position of the slug in the inductor; energy stored inside the slug; oxide layer on the slug side; chamfer of the slug upper corner.

Effect of Ultrasounds during the Solidification Process of the A357 Aluminium Alloy

2012 ◽  
Vol 192-193 ◽  
pp. 428-432
Author(s):  
Antonio Forn ◽  
Manel da Silva ◽  
Maite Teresa Baile ◽  
Josep A. Picas ◽  
Antolí Fauria
Keyword(s):  
Solid State ◽  
Aluminium Alloy ◽  
Ultrasonic Treatment ◽  
Aluminium Alloys ◽  
Solidification Process ◽  
Ultrasonic Waves ◽  
Solid Particles ◽  
Α Phase ◽  
Semi Solid ◽  
Ultrasound Effect

It is known that ultrasonic waves promote nucleation and globulization of solid particles in aluminium alloys. However, the studies performed up to date have been conducted, in the laboratory, using small volumes of aluminium. This article aims to establish the application of ultrasound effect in the A357 aluminium-silicon alloy in amounts of about 2 kg of material. The experiments have been conducted with different parameters of ultrasonic treatment, evaluating the microstructure of the slurry quenched from the semi-solid state. The globulization effect of aluminium α phase by ultrasounds is very effective in the area close to the ultrasonic horn tip and the transmission system, but its effect highly reduces in the regions far away from the source of ultrasonic waves.

scholarly journals Measurement of viscous properties on Al-5mass%Mg alloy in semi-solid state by tensile test with high-frequency induction heating

2021 ◽  
Vol 71 (2) ◽  
pp. 112-120
Author(s):  
Yoshihiro Nagata ◽  
Rikiya Onizawa ◽  
Masaya Someya ◽  
Hiromu Kotaki ◽  
Ryosuke Takai ◽  
...  
Keyword(s):  
Solid State ◽  
Tensile Test ◽  
Induction Heating ◽  
High Frequency ◽  
Mg Alloy ◽  
Semi Solid ◽  
High Frequency Induction

Investigation of Microstructure and Mechanical Properties of Semi-Solid State Joining of SSM Aluminum Alloys

2014 ◽  
Vol 496-500 ◽  
pp. 371-375 ◽  
Author(s):  
Apirit Petkhwan ◽  
Prapas Muangjunburee ◽  
Jessada Wannasin
Keyword(s):  
Mechanical Properties ◽  
Solid State ◽  
Weld Metal ◽  
Butt Joint ◽  
A356 Aluminum Alloy ◽  
Globular Microstructure ◽  
Microstructure And Mechanical Properties ◽  
A356 Aluminum ◽  
Semi Solid ◽  
Solid State Joining

In this research, the semi-solid state joining of SSM A356 aluminum alloy was investigated. The butt-joint of SSM A356 was heated by an induction heating coil to create a localized semisolid pool. Then a stirrer was applied into the joint seam in order to mix the weld metal. The accurate controlling of temperature during joining was measured. The effects of stirring rate on physical, macrostructure, microstructure and mechanical properties were studied. Experimental results showed that increase in stirring rates, the surface of the joint was smooth. The weld metal consisted of the globular microstructure and also voids. The density of weld metal zone increased by an appropriate stirring. The best tensile strength was achieved with 1750 rpm, 70 mm/min for 103.4 MPa.

scholarly journals Properties of „In Situ” 7475 Alloy Matrix Composites Reinforced Al3Ti Intermetalic Compound Extruded in Semi-Solid State

2016 ◽  
Vol 61 (1) ◽  
pp. 433-438 ◽  
Author(s):  
W. Szymański
Keyword(s):  
Heat Treatment ◽  
Solid State ◽  
Aluminium Alloy ◽  
Extrusion Process ◽  
Liquid Aluminium ◽  
Alloy Matrix ◽  
Electron Microscopies ◽  
Semi Solid ◽  
Composite Hardness

Studies were conducted to improve the mechanical properties of composites based on 7475 aluminium alloy reinforced with Al3Ti particles fabricated by the “in situ” process. The first step involved “dissolving” of titanium in the liquid aluminium alloy and fabricating in this way composite materials with different content of the reinforcing phase (15-45wt%). A relationship between the composite hardness and content of the reinforcing phase was confirmed. The second step involved the improvement of cohesion between the reinforcing particles and composite matrix. By extrusion of samples in semi-solid state, an average increase in hardness by 15-20% relative to the unextruded composite was obtained. In the third step, the fabricated composite was subjected to a heat treatment corresponding to the state T6 in 7475 alloy, which raised the hardness by about 30%. Structure examinations carried out by means of optical microscopy and scanning electron microscopies as well as the results of hardness measurements were described. They enabled estimating the effect of the content of produced Al3Ti particles, and of the extrusion process in semi-solid state and heat treatment parameters on the composite properties. In compression test, the yield strength and compressive strength of the heat-treated composites were determined.

The Development and Manufacture of Aluminium Mokumé Gane (Wood-Grain Metal) Decorative Alloy

2004 ◽  
Vol 852 ◽  
Author(s):  
Ian T. Ferguson ◽  
Brian Derby ◽  
G.E. Thompson
Keyword(s):  
Solid State ◽  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Anodic Coating ◽  
Roll Bonding ◽  
Solid State Bonding ◽  
Wide Range ◽  
Wood Grain ◽  
Strong Contrast

ABSTRACTThe application of contemporary metallurgical knowledge and solid state bonding techniques provide for development of entirely new Mokumé Gane combinations. A multi-layered aluminium alloy is manufactured by the successive hot roll-bonding of two different aluminium alloys. The surface is then embossed with a selected pattern and machined back, exposing the various alloys. A range of suitable alloy combinations has been identified. When anodised, the surface presents the pattern as a strong contrast due to the differing anodising properties of the constituent alloy layers. The anodic coating can then be dyed with a wide range of colours to develop the decorative potential of the technique.

scholarly journals Recrystallisation in the semi-solid state in 7075 aluminium alloy

2008 ◽  
Vol 490 (1-2) ◽  
pp. 266-276 ◽  
Author(s):  
H.V. Atkinson ◽  
K. Burke ◽  
G. Vaneetveld
Keyword(s):  
Solid State ◽  
Aluminium Alloy ◽  
Semi Solid
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